Sunday, March 11, 2012

x 1955-1985: The IPPB Revolution x

"This 1960s Monaghan Ventalung ad is a part 
of our IPPB Virtual Museum.http://museum.aarc.org/gallery/ippb/,"
said an AARC Facebook post on 3/25/16
If you were a respiratory therapist anytime between 1955 and 1985 you're familiar with Intermittent Positive Pressure Breathing.  While the machines were initially introduced to be used as respirators, physicians soon decided they were useful for delivering respiratory medicine and preventing and treating post operative atelectasis and pneumonia.   The IPPB revolution was born.

The first machine capable of providing positive pressure breaths over an extended period of time without the assistance of a person was introduced in 1948 as the Monaghan Ventalung Respirator.  These machines were used during WWII as ventilators.  They were nice because the alternative was to use an Ambu-bag to keep people breathing, in which case the provider of breaths would have to rotate through two hour shifts around the clock.

It was likewise during WWII that Dr. Forrest Bird became interested  in creating a device to allow pilots to fly higher.  It was believed if a pilot could fly higher he could avoid the enemy, and stay out of range of their ammunition.  (1)

This quest lead to the first  pneumatic respirator, meaning it was completely driven by compressed air and no electricity was required.   It was a small, portable green box, and all you had to do to start it up was plug it into a 50 PSA oxygen source, such as an oxygen tank or piped in oxygen system, and turn up the flow.   It was portable and provided a nice, easy means of providing mechanical breaths. For this reason the Mark 7 became the most popular such machine, although the  Mark 1,  Bennet TV-2P Vivian, Monaghan Ventalung Respirator, and the Manley Ventilator provided viable alternatives.

It was quickly learned that when used as a ventilator there were four problems:

  1. No manometers or devices to indicate how much of a tidal volume you were delivering
  2. Bird Mark 4 (1955)
  3. No alarms to indicate you were giving too much pressure or the patient was disconnected
In order to accommodate these disadvantages, respiratory therapists had to continuously check on the machines.  They would also have to be placed close to nurses stations so they could be closely monitored.  I believe this was the main reason hospitals started creating intensive or critical care units.  

It didn't take long for physicians to come up with another use for these machines.  It was believed that by providing positive pressure breaths with medicine for 5-15 minutes three to four times per day that certain condition could be treated and even prevented.  This gave birth to the use of the machines as Intermittent Positive Pressure Breathing machines, and the IPPB treatment.

The devices came with a nebulizer cup on the inspiratory circuit, and initially the medicine used was ethyl alcohol to treat patients with foaming pulmonary edema that results from heart failure.  The alcohol was nice because it soothed the bubbles, and it worked quite fast.  The IPPB was believed force the medicine deeper into the lung parychema, and thus make the medicine work better.

Soon such treatments were believed to be useful to prevent and treat postoperative atelectasis and pneumonia.  When a patient is so sore due to chest or abdominal surgery (back then it was probably usually an abdominal surgery) they tend to not want to take deep breaths due to pain.  This results in air sacks not being filled with air, and thus they collapse.  This is called atelectasis.

A non-disposable IPPB circuit with neb cup
Such hypoventilation often results in increased secretion buildup, and this causes inhaled bacteria becoming trapped in the lungs, and this results in your postoperative pneumonia.  This condition ultimately worsens the patients condition, makes treating them more complicated, and sometimes even results in respiratory failure and even death.  IPPB treatments were believed to prevent and treat this.

It was also believed IPPB treatments with Isuprel, the bronchodilator available at that time, would be useful to treat chronnic bronchitis and asthma patients.  Mucus thinners such as Alevaire and Mucomyst were also used to help patients expectorate thick secretions.  Soon these machines were used on all preoperative, postoperative and all patients with just about any respiratory disorder.  The IPPB revolution was in full stride. 

By the 1960s IPPB therapy became popular for giving aerosols to patients admitted with just about any lung ailment.  (2)  This was done despite proof it did any good. According to a 1957 article in the The American Journal of Nursing, "Nebulization Under Intermittent Positive Pressure," the following were marked as conditions treatable with this therapy: 
  1.  Pulnonary edema
  2. Atelectasis
  3. Bronchial asthma
  4. Bronchiectatsis
  5. Emphysema
  6. Pulmonary fibrosis
  7. Silicosis
  8. Impairment of respiratory function resulting from barbituate pooisoning and poliomyelitis  (3)  
Indications for such thearapy were:
  1. To overcome breathing resistence
  2. Provide more uniform alveolar aeration
  3. Distribute aerosols to terminal bronchioles where absorption takes place
  4. Relieve bronchospasm
  5. Improve bronchial drainage
  6. Provide exercise for respiratory muscles
  7. Improve pulmonary funciton (4) 
It was difficult to get some patients to coordinate breaths with the machine breaths.  And with no way of measuring tidal volumes, it was difficult to know if you were delivering the recommended 25% greater tidal volumes than the patient's normal tidal volume.  So while the machines were simple, you had to have a good teaching technique by the RT, good coordination by the patient, and good settings dialed in by the RT.

Another thing of importance to note is that at this time respiratory therapy procedures were reimbursed by insurance companies and Medicare.  There was no incentive for administrators to question the need for such therapy considering it was profitable for the hospital.  Yet this all changed in the 1970s when such therapy came "under scrutiny" when insurance and government agents questioned that the treatments did any good, especially considering they were expensive.  (5)

It was also at this time that researchers were proving by scientific evidence IPPB treatments were no more effective than using a nebulizer to deliver medicine and an insentive spirometer to encourage the patient to take in deep breaths.  Studies also showed that IPPB therapy deposit 32% less of aerosolized medicine to the lungs than a simple aerosol treatment.  Any benefits provided from the therapy were also proven to be short lived, lasting less than an hour.   (6)
Bird Mark 7

The RT textbook, "Foundations of Respiratory Care," sums up IPPB therapy for us:  "The Overuse of IPPB was eventually to become an embarassment to the profession, but in the 1950s and 1960s, IPPB devices could be seen throughout most hospitals in the United States."  By the 1990s such devices were collecting dust in the backs of respiratory therapy closets.

Yet many smaller hospitals, including the ones I've worked for, continued to abuse this therapy throughout the 1980s and 1990.  I remember doing quite a few of them in the 1990s.  Despite evidence such therapy isn't useful, one of our physicians ordered such a treatment a few weeks ago.  I actually had to have a coworker refresh my memory on the device since it had been so long since I used one.   (7)

References:
  1. Glover, 
  2. Hess, Dean R., et al, "Respiratory Care:  Principles and Practice," 2012, "Intermittent Positive Pressure Breathing," chapter 18, page 370 
  3. Stephen, Phyllis Jean, "Nebulization Under Intermittent Positive Pressure," The American Journal of Nursing," 1957, Sept., vol. 57, No. 9, pages 1158-1160
  4. Stephen, ibid
  5. Hess, Dean R., et al, "Respiratory Care:  Principles and Practice," 2012, "Intermittent Positive Pressure Breathing," chapter 18, page 370
  6. Hess, ibid, page 370
  7. Wyka, op cit

Friday, March 09, 2012

1950- 1980: The evolution of the artificial respiration

The technique of inserting a hollow tube through the oral cavity to the lungs was first attempted as far back as 1788, and by 1858 the equipment and procedure was improved enough for intubation to be recommended to the medical community.  The idea, however, was rejected as preposterous by all but a few physicians who dreamed that the method might some day provide a viable airway, if not given up on.

A few random physicians attempted the procedure in order to save a life, or to perform some difficult operation, yet successes were far and few between.  Yet thanks to those who dreamed of helping their fellow human beings, and who never gave up despite past failures, the procedure was slowly



By the turn of the 20th century the medical community was becoming increasingly confident in recommending and performing the procedure of intubation.  We have to realize that initially the medical community rejected the procedure altogether



1940:  Miller 

1942:  Anesthesia during intubation:  Endotracheal tubes were refined during the 19th century so by the turn of the century a variety of tubes were used, including metal and rubber tubes. Occasionally anesthetics were used to paralyze the patient prior to inserting such a tube, yet this wasn't common practice until 1942 when Harold Griffith, a Canadian anesthesiologis, used curare (succicholine).  This was a major breakthrough because it allowed surgeons the opportunity to sedate and ventilate patients during operations.  (1, page 227)



 It was also during this decade that Robert Miller refined the laryngoscope so it was straight, and it's referred to as either the Miller or straight blade.  Roger MacIntosh refined the laryngoscope so it was curved, and it's reverred to as either the MacIntosh or curved blade.  Variations of both are still used to this day, and both come with a handle with a battery that the blades attach to.  At the end of the blades are a small lightbulb so the person intubating can visualize the vocal cords.  During WWI Sir Ivan Whiteside Magill was the first to use rubber endotracheal tubes which he inserted through the nose and assisted their transfer into the airway with forceps we now refer to as Magill forceps.  In this way he also dubbed the term "blind intubation." (2)  Magill was said to have "mastered the technique of

References:  
  1. Szmuk, et al, "A brief history of tracheostomy and tracheal intubation, from the Bronze Age to the Space Age," Intensive Care Medicine, 2008, 34, pages 222-228, reference to page 227
  2. Subramaniam, Rajeshwari, "A primer of anesthesia," 2008, MO, Jaypee Brothers Medical Publishers

1947:  Morch's Piston Ventilator:  Dr. Ernst Tier Morch designed one of the first ventilators that provided positive pressure breaths to a patient.  It became one of the first such ventilators available in the United States and Europe.  It allowed for inhaled air to both be humidified and oxygenated, and provided an alternative respirator to the iron lung in ventilating polio victims.  It was also used during abdominal surgeries.  A second and third model would be introduced during the 1950s. (3)  It was the first modern type volume ventilator on the market. (4)  One major disadvantage is that it only allowed for controlled ventilation, which made it very difficult to ventilate patients who were awake and alert and orientated because it would be very uncomfortable.  Bucking of the vent would be quite common.  Another problem is alarms were limited. 

1948:  Continuous Positive Airway Pressure:  During WWII Alvin Barach supervised experiments whereby Continuous Positive Airway Pressure (CPAP) was used on a variety of pilots who traveled to high altitudes.  After the war he studied the use of CPAP on a variety of patients, although his work was relatively ignored until the 1980s when studies would confirm CPAP was beneficial for COPF and sleep apnea patients.  CPAP would also be studied in the 1980s as a means of preventing a patient from requiring intubation.  (v5)

1948:  Monaghan Ventalung Respirator:  It was the first machine that could be used as a ventilator and provide intermittent positive pressure breathing (IPPB).  According to Dennis W. Glover in his book, "The History of Respiratory Therapy:  Discovery and Evolution," these machines were used during WWII as ventilators.  It was also during this time IPPB therapy was first used.  The machines were introduced to hospitals in 1948.  At this time positive pressure breathing either by Ambubag or machine were provided by inserting a cuffed tracheotomy tube into the patient's airway.  A rubber mask could also be used.  Cuffed rubber ETTs were also available if necessary.

1950s-1970s:  Rubber masks:  Positive pressure breaths were often provided by using a rubber mask over the patient's mouth and nose.  One of the major complications of the rubber masks used at this time was that they were opaque and concealed aspiration or foaming pulmonary edema, and this was noted as a major disadvantage of such masks.  Another disadvantage was prolonged use caused facial skin breakdown.   Another disadvantage is air would often leak around the masks.   And yet another complication was the masks required a person to hold the mask securely on the patient's face.    When done over a prolonged period of time this could become very tiresome.  When used on polio patients nursing assistants or respiratory therapists would often work in two hour shifts.  The disadvantages of these masks could be compensated for by tracheotomies and inserting a catheter, and later  by intubation.  (v6)

1952: The Bird Mark I:  Roger Manley was an anesthesiologist who was initially concerned with ventilating patients given anesthetics.  It could be used as a ventilator and to provide IPPB.  It was often referred referred to as the Manley Ventilator.  He later refined it and re-branded it as the Mark II.

1952:  Bennett Pressure Breathing Unit:  It was studied successfuly in 1948 and marketed as the main alternative to the Bird Mark 1 by creator V. Ray Bennett.  Like the Mark I and Mark II it was a  pressure cycled ventilator.  It had a nebulizer cut for the nebulizatiion of Isuprel (a bronchodilator) and Alevaire (mucus thinner), Mucomyst (mucolytic) and ethyl alcohol (to cut allay the bubbles in foaming pulmonary edema).  The machines was commonly used as a ventilator instead of iron lungs when suctioning of the airway was required.  Iron Lungs and IPPBs being used as ventilators were pretty much phased out when volume ventilators were proven to be more effective and safer ventilators.  Bennet later refined this machine and re-branded it as the Bennett PR 1 and Bennet PR 2, both of which were still mentioned in respiratory therapy texts through the 1990 as you can see here.  (t7)

1951:  Engstrom ventilator:  Carl-Gunnar Engstrom invented a respirator that would allow "efficient control of gas volume delivered to the patient and also allows for active exhalation.  It can also be used for both adults and children, and it is the first apparatus suitable for long-term ventilation as well as for use during anesthesia."  Engstrom wrote a paper suggesting how inadequate iron lungs were and how much better volume ventilators were for long term ventilation of patients. (8)  Like the Morch Ventilator, it was among the first volume ventilators.  However, also like the Morch Ventilator, alarms were limited and the only mode was was controlled ventilation. 

1953:  AMBU Bags

While not a machine, per se, the bag valve mask (BVM) is a significant development in providing artificial breaths to patients in need. The AMBUbag invented in this year provided another less expensive option to expensive iron lungs and the recently invented and very complicated pressure respirators.  This became an important option for ventilating polio victims who presented with excessive and/or thick secretions.  BMVs were could be connected to a rubber mask for temporary ventilation, or to a tracheostomy for long-term ventilation.  Therapists worked in two hour shifts giving breaths.  You can read more about the history and significance of BVMs by clicking here
1955: Bird Universal Medical Respirator ( Bird Mark 7 Universal Respirator , the Bird)

Dr. Forrest Bird became interested in creating a device during WWII that would allow pilots to fly higher.  This quest lead to the first  pneumatic respirator, meaning it was completely driven by compressed air and no electricity was required.  It was a small, portable green box, and all you had to do to start it up was plug it into a 50 PSA oxygen source, such as an oxygen tank or piped in oxygen system, and turn up the flow.  Like the Mark I and Bennett respirators it was pressure cycled.  It was portable and provided a nice, easy means of providing mechanical breaths. For this reason the Mark 7 became the most popular such IPPB machine, although the  Mark 1,  Bennet TV-2P Vivian, Monaghan Ventalung Respirator, and the Manley Ventilator provided viable alternatives.

These machines had another use that ultimately became the embarrassment to the profession.  You can read more about that by clicking here.

1960:  Amsterdam Infant Ventilator Mark I:  It was one of the first ventilators available to provide IPPB to infants with respiratory distress.  In 1974 the benefits of CPAP were noted, and a screw clamp was inserted on the expiratory limb of the circuit so the device could provide both IPPB and CPAP.  It was used both in neonatal intensive care units (NICU) and operating rooms.  Calculators were used to determine tidal volume, minute ventilation, and total flow.  (QQ14)  It's generally referred to as a constant flow ventilator with a pneumatic time cycler.  The ventilator was updated as the Mark II.

1964:  Emerson Volume Ventilator:  According to Richard Branson in his 1998 article in Respiratory Care celebrating the life of John Emerson, Emerson was the second to produce a volume ventilator.  Bronson described it like this:
"This simple devise resembled a green washing machine and used a piston to deliver precise volumes. Oxygen was added into a ‘trombone-shaped’ accumulator connected to the intakeof the piston for delivery of elevated FIO2. The tidal volume was changed by a crank on the front of the machine, which controlled the stroke of the piston. Respiratory rate and inspiratory-to-expiratory-time ratio (I:E) were adjustable. The humidifier was a modified pressure cooker and was known as the Emerson Hot Pot. A belt, connected to a DC motor and pulley wheel, served to move the piston. In case of failure of the existing belt, a spare was hung inside each cabinet. The belts were similar to those used to circulate air in forced air gas furnaces in homes. On numerous occasions I have heard the story of the belt becoming loose or breaking and the spare found to be missing. Under these circumstances, the resourceful respiratory therapist would run to the parking lot and obtain the belt from a Volkswagen Beetle (the old one) and place it in the Emerson to restore it to working order. I’ve never looked to see whether the two belt sizes are compatible because it’s such a good story. In any event, the Emerson Postop VolumeVentilator was reliable and would allow ventilation of patients when other devices failed. Emerson’s device was not the first of the piston ventilators (M¨orch and Engstrom preceded him), but it was the first device to allow independent control of I:E." (15z)
1964:  Bourn's Piston Driven Infant Ventilator (LS104-150)

This was the first ventilator specifically made for infants.  It was a volume ventilator, which meant that while it may have save lives, it also may have been responsible for forcing too much air into little lungs and causing collapsed lungs which further hampered physician's attempts to save sick neonates.  IMV ventilators and CPAP were later proven to be more effective and safer for use on neonates.

1967:  The Puritan Bennett MA1

In 1940 Ray Bennet produced a gas delivery system that involved a "jewled pneumatic valve - the 'valve that breathes with the patient."  It was this concept that allowed the Puritan Bennett company to create the the MA1. (a16) (b17)

The ventilator gave care practitioners much more control over the patient's breathing.  One reason is  the machine offered more than one mode instead of just control.  Along with control modes it offered assist control (AC), which allowed the patient to trigger spontaneous mechanical breaths between scheduled machine breaths.  Later on Intermittent Mandatory Ventilation (IMV) was added via an external line,  and later Synchronized Intermittent Mandatory Ventilations (SIMV).  IMV and SIMV allowed the patient to take spontaneous breaths between machine breaths and made it much more comfortable for the patient.

It was a compact and durable unit that could easily be carted to the patient's bedside, and provided the patient with positive pressure breaths once connected to an endotracheal tube (ETT) that had to be inserted into the patient's airway.  This device and others like it (volume ventilators) took over for the above mentioned IPPB machines as the main sources for mechanical breathing.  Because the patient was intubated, gaining access to the patient was much easier for nurses and doctors, and airway maintenance was much more efficient.  For it's time, the MA1 was a very good and durable ventilator.

The basic settings were simply dialed into the machine: rate, tidal volume, sigh depth, sigh rate, etc.
While it was a bit complicated, the ventilator could be connected with many different alarms and manomoters, such as high rate, low rate, high pressure, low pressure, and tidal volume and rate.  However, these could be quite complex to set up and operate.

Many hospitals had one.  In fact, when I started as an in 1995 the hospital I worked for had one as the "emergency back up" ventilator.  All the knobs were on the front and it was pretty easy to set up, it was just a challenge to operate all the alarms.  Thankfully the device was shipped to somewhere in Asia prior to the turn of the century.  Ultimately there was an MA2, yet it wasn't anything as popular as the old faithful MA1.

1967:  PEEP:  Ashbaugh and Petty were the fist to describe a condition called Acute Respiratory Distress Syndrome (ARDS), and they described it as a severe respiratory distress associated with refractory hypoxemia, or hypoxemia (low oxygen in the blood) that does not get better with increased oxygen, and decreased lung compliance and diffuse lung infiltrates.  The disease condition causing the syndrome may vary from patient to patient, including sepsis, pneumonia, trauma, etc.  In 1971 the condition was renamed adult respiratory distress syndrome to differentiate it with the neonatal form.  It's often referred to as noncardiogenic pulmonary edema.  There was a high rate of morbidity (as high as 100 percent) with the syndrome, and the initial treatment they found effective and eventually recommended was increasing Positive End Inspiratory Pressure (PEEP).  A valve was inserted at the end of the expiratory circuit.  Since this time various treatments have been recommended, such as low tital volumes (6-10cc/kg/ideal body weight) with positive results. (yyyyyyy)

1970:  Respirator name change

I'm probably no alone in wondering why sometimes these machines are referred to as respirators and now they seem to be more commonly called ventilators.  The actual reason may continue to elude us. However, Glover describes in his great book on the history of respiratory therapy that sometime around 1970 the term respirator was changed to ventilator.  As a rule of thumb, I think we can safely conclude that most breathing machines made prior to 1970 were referred to as respirators, and most breathing machines made after 1970 are referred to as ventilators.  Perhaps only the Lord knows why the change in name was made, or even if it was an official name change.

1969:  Baby Bird


By the 1960s there were a series of ventilators that provided breaths for adults, yet few that would do the same for infants.  A major concern was that providing pressure into an infant's lungs would cause a pneumothorax.  Up to this point the main method of ventilating newborns was with neonatal Ambu-bags, although there were occurrences where a gentle squeeze of the bag may turn to a harsh squeeze and a collapsed lung.  So the market was open for a baby ventilator to deliver consistent breaths.  Forrest Bird tapped into this market with the first ventilator specifically designed for ventilating infants.  It was time cycled and pressure limited, and provided constant breaths at a desired frequency.  It was crude by today's standards, and required some math to set up and maintain, yet it was a good ventilator for its day.  This and other similar ventilators helped to significantly reduce infant mortality rates by up to 70 percent by the end of the decade

1971:  Servo 900 Ventilator

It was small, slightly larger than two shoe boxes, and all the knobs were on the front.  It became known as a minute ventilation ventilator because the respiratory therapist would set the minute ventilation and the tidal volume and respiratory rate would be secondary.  In this way, in volume control mode the tidal volume could be set.  This machine had a sensor to make sure the tidal volume was adjusted with changes in patient compliance so the patient was guaranteed to get the set tidal volume.  This was the first ventilator to have this function.

In order to set tidal volume, though, you had to do a little math.  I know because when I did my clinical rotation in 1996 at Blodgett Hospital in Grand Rapids Michigan they still used this ventilator on a regular basis.  It was also commonly used on cardiac patients at Mott's Children's Hospital at the University of Michigan when I did a rotation there.  Many students were afraid to use it, yet once you were used to it it was a very nice ventilator.  However, students were thankful when it was ultimately replaced by the Servo 300 Ventilator.

It was the first ventilator to have all the alarms you needed right on the machine, and it was also the first ventilator to allow for the addition of a device so you could see pressure and flow curves.  This was nice because you could see what you were doing and make changes based on the needs of the patient. (d18)

 It was also the first ventilator to provide both volume control and intermittent positive ventilation (IMV), which was later improved to synchronized intermittent positive ventilation.  These new modes improved the physician's ability to wean a patient from the ventilator. (e19)

The ability to measure exhaled CO2 was a feature added in 1978, which provided clinicians a noninvasive means of measuring CO2 other than by obtaining an invasive arterial blood gas (ABG). The inline CO2 monitoring was nice because it allowed clinicians to quickly adjust to changes in the patient's condition rather than wait up to 30 minutes for the results of an ABG to be returned.  (e20)

In 1981 Positive End Airway Pressure was introduced to the Servo 900 series.  There were other methods of adding PEEP prior to electronic PEEP, yet they were much more complicated and provided non-measurable and unstable levels with increased expiratory resistance.

Eventually pressure support (PS) added, making the Servo 900 C the first ventilator that interacted with the patient and supported his breaths. Before PS was an option all modes of ventilation provided mandatory breaths.  Pressure control was also added to the Sero 900 C.  (e21)

1973:  Intermittent Mandatory Ventilation:  (22xxxxx)  The concept that a patient be able to take a spontaneous breath between mechanical breaths only made sense.  It was believed if this was possible it would prevent the patient from bucking the ventilator, giving the patient more control.  Other initial claims were that it would reduce the need for sedation, improve kidney and heart function by lowering intrathoracic pressure, facilitate weaning from the ventilator.  Initially the IMV set up was complex and required intensive effort by the patient.  With this new mode, engineers concentrated on finding better methods of allowing the patient trigger breaths.

1976:  Bourne BP 200 respirator

It was another in a line of neonatal ventilators.  Like the Baby Bird, it was set up using crude mathematical formulas.  Steven Sittig, RRT, described it best in his article, "Neonatal Mechanical Ventilation Support:"
"Few clinicians today would remember an early model Bourne BP 200.  To set the To set a respiratory rate on this model, the clinician had to set the inspiratory time and then calculate the inspiratory-to-expiratory-time ratio (I-E) for the desired rate.Then the RT had to move theI-E ratio knob to the approximate ratio, watching to avoid a red light on the display that signaled an inverse I-E ratio. Finally, the clinician had to check the ventilator rate using a watch.   (23)
I personally don't remember this ventilator, but my first job as an RT had a Baby Bird as the back up ventilator, and even after I was instructed on how, I prayed I never had to use it:  it was very intimidating.  Just the idea of using a calculator and watch to set up a ventilator seemed so old fashioned.  After looking at that vent I was happy for new technology.

Sechrist Infant Ventilator
Early 1970s:  Sechrist infant IV 100B:  A pneumatically powered, single circuit, O2 blender, continuous gas flow,

1976:  Bourns Electric Adult Respirator (a.k.a. the Bear 1)

It was a hugely vertical rectangular blue ventilator with simple control knobs on the front interface.  The ventilator was updated twice during the 1980s as the Bear 2 and Bear 3.  A Bear Cub was also marketed for the infant market to replace the previous Bourn infant respirators on the market and compete with newer IMV infant electric ventilators.  Several other Bear products have since been introduced to the market, including the Bear 33 in the 1990s, the Bear 1000 Adult/ Pediatric Ventilator in 1992, and the Bear Cub 750 VS Ventilator in 1996.

1978:  Stylets:  The idea of using a stylet inside an ETT to assist with intubation was first used in 1978.  The first stylets were central venous catheters, yet later stylets were manufactured specifically for modern disposable PVC plastic ETTs, of which come in a variety of sizes.

1980:  Synchronized Intermittent Mandatory Ventilation:  This was basically an improved version of IMV that allowed the ventilator to better "synchronize" the spontaneous and the mechanical breaths to make being on a ventilator more comfortable for an awake patient, and to prevent the patient from "bucking" or "fighting" the ventilator.  The lower the respiratory rate the more spontaneous breaths the patient was allowed.  The mode also required ventilators to be more sensitive to recognizing the patients desire to take spontaneous breaths.  (24xxxx)

References:  (under construction)
  1. Szmuk, et al, "A brief history of tracheostomy and tracheal intubation, from the Bronze Age to the Space Age," Intensive Care Medicine, 2008, 34, pages 222-228, reference to page 227
  2. Szmuk, ibid
  3. The Wood Library Museum, "Mueller-Morch Piston Respirator," woodlibrarymuseum.org, http://woodlibrarymuseum.org/museum/item/64/mueller-morch-piston-respirator-, accessed March 2, 2012. 
  4. Kishen, Roop, chapter 2, "Perceptions, Perspectives and Progress:  Intensive Care 50 years on," of the text, "Critical Care Update 2010," 2011,  page 7, edited by Roop and Vineet Nayyar
  5. Wyka, Kenneth A., Paul J. Mathews, William F. Clark, ed., "Fundamentals of Respiratory Care," 2002, . page 630, Section IV, Essential Therapeutics
  6. Wyka, ibid
  7. Sills, J.R.,  "Modifying IPPB Therapy," Respiratory Care Certification Guide, 1994, second edition, St. Lois, Mosby.
  8. Gedeon, Andras, "Science and Technology in Medicine," 2006, page 450-51, Carl-Gunner Engstrom
  9. ippbHess, Dean R., et al, "Respiratory Care:  Principles and Practice," 2012, "Intermittent Positive Pressure Breathing," chapter 18, page 370
  10. ippbStephen, Phyllis Jean, "Nebulization Under Intermittent Positive Pressure," The American Journal of Nursing," 1957, Sept., vol. 57, No. 9, pages 1158-1160
  11. ippbStephen, ibid
  12. ippbHess, Dean R., et al, "Respiratory Care:  Principles and Practice," 2012, "Intermittent Positive Pressure Breathing," chapter 18, page 370
  13. ippbWyka, op cit
  14. QQ  Holand, J. et al, "Historical Note:  Keuskamp and Amsterdam Infant Ventilator," Anesthesia, 2006, 1, pages 65-71
  15. Branson, Richard,  Branson, Richard D, "Jack Emerson:  Notes on his life and contributions to Respiratory Care," Respiratory Care, July 1998, vol. 43, no. 7, pages 567-71
  16. "Company History," Puritan Bennett Corporation,  http://www.fundinguniverse.com/company-histories/PuritanBennett-Corporation-Company-History.html, accessed February 27, 2012
  17. "About us:  Respiratory Products for nearly a century," PuritanBennet.com,  http://www.puritanbennett.com/about/index.aspx, accessed February 27, 2012
  18. "About us:  History of Ventilation," maquet.com,  http://www.maquet.com/sectionPage.aspx?m1=112599762812&m2=112599885558&m3=112600545105&m4=112806653448&wsectionID=112806653448&languageID=4, accessed February 27, 2012
  19. "The Servo Story:  Thirty Years of Thechnological Innovation Evolving with Clinical Development of Ventilatory Treatment Strategies," www.maquet.com,  http://www.maquet.com/content/Documents/Site_Specific/MAQUETcom/GENERAL_The_Servo_Story.pdf, accessed February 27, 2012
  20. "The Servo Story...," ibid
  21. Sittig, Steven E, "Neonatal Mechanical Ventilation Support," AARC Times, April, 1999, page 51
  22. xxxxxxSmith, B.E., C.D. Hanning, "Advances in Respiratory Support," British Journal of Anesthesia, 1986, 58, pages 1380150 
xxxxxx Smith, B.E., C.D. Hanning, "Advances in Respiratory Support," British Journal of Anesthesia, 1986, 58, pages 1380150

yyyyyyyyy Klein, J.J., et al, "Pulmonary function after recovery from the adult respiratory distress syndrome," Chest, 1976, 69, pages 350-55

Thursday, March 08, 2012

1854: M. Priory fine tunes stethoscope and percussion

Pierre Adolph Priory (1794-1879)
Joseph Auenbrugger, Jean Corvisart, and Rene Laennec introduced the medical community to the technique of chest percussion, and the invention of the stethoscope to improve the technique of auscultation.  Both techniques became valuable for helping physicians diagnose diseases of the chest, although both needed to be perfected.  

By the time of his death in 1826, Rene Laennec saw his invention of the stethoscope become accepted by his peers.  However, he would readily admit that his new tool was not yet perfected. He would spend many hours himself improving upon it, and when he died this task was left to his peers.

Pierre Adolph Piorry (or M. Priory, with the M. coming from his French name) was born in 1794, served in the Napoleanic wars in Spain, and served at the Atarazanas Hospital in Spain where he was able to witness military surgery." In 1814 he returned to his medical practice in France, and, like Laennec, served as a student of Corvisart. He qualified as a physician in 1816, the same year Laennec invented his stethoscope.  (1, page 675)

This is a picture of the Priory binaural stethoscope complete with
the pleximeter(round, solid ivory disks on bottom second from left)
and fingerthimble ivory percussor (on botton right).  Picture from 1828.
Photo from http://www.antiquemed.com/binaural_stethoscope.htm
He had a gift as a teacher, and between 1817 and 1826 he delivered lectures on physiology and pathology.  In 1826 he was appointed physician to the Paris Hospital.  In 1837, after many years of attempting to do so, he became professor of medicine at Paris School of Medicine (l'Hospital de la Pitie, Paris).  He was 43.  (1, page 676)

He then took off where Laennec left off, working hard to fine tune the binaural stethoscope.  The product he ended up with would be the general design of most stethoscopes used for the rest of the 19th century.  He also worked to improve the technique of percussion.  His work in this area created excitement for the remainder of the century, it would ultimately be for naught. (1, page 675)

A Classic Reprint Series of Priory's book
is proof his ideas are still sought after.
The first edition was published in 1826.
His stethoscope was trumpet shaped and made of wood, although it was shorter and thinner than Laennec's.  It came with a removable wood plug, ivory earpiece and chest piece, with the chest piece also serving as a pleximeter (described below).  This design was also much more pleasing to physicians, and was much easier to carry in their bags. (5)

In a 1979 Biography of Priory, Alex Sakula said of Priory
Priory, enthused by Laennec's invention, developed an ambition to emulate the great master and to achieve fame in some similar fashion. Priory describes in his poem Dieu L'ame et Nature how he came to study percussion.  He prayed to God asking to be able to make some discovery like that of Laennec.  A few months later, he had slight pruritus and while scratching the skin over his chest he heard a sound.  He interposed a coin and scraped it and obtained a stronger sound, which varied according to the density and elasticity of the underlying organ." (1, page 577)
This is a picture of Priory's Pleximeter. (5, page 311)
Sakula said that the next day he began his work on percussion, and hoped that what Laennec had done for auscultation he could do for percussion.  On February 28, 1826, he read "read a prize winning paper on his new method of percussion to the Academie Royale de Medecine.  Laennec (then very near his death) was one of those present." (1, page 577)

Scott Alison, in his 1861 book, "The physical examination of the
 chest," described the procedure of percussion as follows: 
 The pleximeter is to be placed in or over an intercostal space,
 or upon a flat surface, and fitted well with gentle pressure upon
 the body,and held by the thumb and forefinger of the left hand. 
It may be employed together with a hammer or with the fingers." 
A percussion hammer is sown here.  (5, page 311
In the paper, Sakula said, he described his new technique of doing percussion, which involved placing a small plate between the patient's skin and the percussing finger.  He called the plate a pleximeter from the Greek w``ords to strike and to measure. (1, page 577)

As Laennec experimented with various materials while trying to perfect his stethoscope, Priory experimented with various materials while trying to perfect his pleximeter, said Priory, "but finally settled on a small ivory plate, 5 cm in diameter.  He also devised a combined stethoscope and pleximeter made of ivory and cedar wood." (1, page 577)

This little gadget shows the extent that some physicians went to 
create the perfect pleximeter.  Scott Alison described it as:
"An instrument combining both a pleximeter and a hammer 
was contrived by Dr. Aldis some years ago. It consistsof a
 hammer moving on a fulcrum, and of a disc of cork which 
receives the blow of the hammer. The cork disc is placed 
upon the chest, and the hammer is raised by the finger to the
 required height. The higher the hammer is raised, the more force
 is obtained. The hammer falls by the operation of a spring.
 Great uniformity of blow is obtained by this instrument. 
This ingenious contrivance has obtained the name of 
echometer." (5, page 312)


After all the publicity that that stethoscope had garnished since Laennec introduced it in 1819, percussion had lost some of its luster.  Some probably believed the stethoscope would replace it completely.  (1, pages 576-577)

However, Sakula said:
"Piorry did not regard percussion as competing with auscultation, and taught that the two techniques were supplementary one to another." (1, page 577)
These are a few of the varieties of wooden binaural stethoscopes
in use by physicians as of 1861. (5, page 316)
There were still many physicians who did not adapt his stethoscope and pleximeter.  Many who finally accepted his research on percussion came up with their own techniques for performing the procedure.  For instance, the preferred method became the use of the finger of one hand used as the pleximeter, and the finger of the other hand as the percussor.  Yet the principle is the same.  (1, page 577)

This is a flexible stethoscope.  In his 1861 book, Scott Alison said,
"In employing the flexible stethoscope, it is even more necessary
than in the case of the wooden instrument to observe that the object
end is well applied so as to close the tube.  If left partially open,
scarcely any sound is perceived. (5, page 321)
The Cyclopaedia of Practical medicine, edited in part by John Forbes, best concludes the accomplishments of Priory regarding percussion: (3, page 7)
M. Priory, a young Parisian physician, has the honor of having, if not invented, at least brought into a formal and matured shape, this new application of the discovery of Auenbrugger, and with practical results greater precision and importance than could have been anticipated. (3, page 7)
Dr. Sibson's pleximeter 
consists of a plate of 
ivory which receives
the blow, and of a brass
hammer or weight
working in a metal frame.
. The weight or hammer
is raised by the fingers;
these being removed, 
the weight or hammer 
falls upon the ivory plate
by the elasticity of an
indiarubber band connecting 
the weight or hammer 
with the ivory plate.
The hammer works
perpendicularly
to the plate. (5, page 313
Like many new tools invented or discovered to assist physicians do their jobs better, the Priory stethoscope and pleximeter were not accepted by all physicians.

Piorry remained a famous physician until his retirement at the age of 72 in 1866.  He died at age 85 in 1879.

Most stethoscopes used for the remainder of the 19th century after Piorry's death were based on his design, designed by various physicians, produced by various manufacturers, made of various materials, and scattered throughout various publications. Some of these other binaural stethoscopes were made by Quain, Stokes, Arnold, Barclay, Elliotson, Dobell, Loomis, Burrow, Clark, Camman, and Furguson. (4, page 626)

Yet long before he passed from this world his hard work paid off.  By 1854 percussion had been fine tuned so that it was often performed not just over the chest, but over various organs of the body to help doctors diagnose any pathological disorders.

And his stethoscope remained the most popular one used for the remainder of the 19th century.  There were many similar versions by various manufacturers, although most of them are simply adaptations of the binaural stethoscope that M. Priory fine tuned.

References:  
  1. Sakula, Alex., "Pierre Adolphe Piorry (1794-1879): pioneer of percussion and pleximetry," October, 1979, Thorax ( 34(5): 575–581).  
  2. "The Binaural Stethoscope," antiquemed.com, http://www.antiquemed.com/binaural_stethoscope.htm, information reviewed March 8, 2012
  3. Forbes, John, Alexander Weedie, Conolly, editors, "The cyclopaedia of practical medicine," volume 1, London, 1833
  4. Camman, Donald M, "Historical Sketch: Stethoscopes," A Reference Handbook for Medical Sciences, edited by Albert Henry Buck, by various writers, volume VI, 1888, New York, William Wood and Company, 626-628
  5. Alison, Somerville Scott, "The physical examination of the chest in pulmonary consumption and its intercurrent diseases," 1861, London, John Churchill

Wednesday, March 07, 2012

History of oxygen for asthma

This post has been edited and rewritten.  It will be republished in January and February of 2013, and greatly improved.  The new posts will provide much more historical information about oxygen therapy for asthma, including pictures.

References:
  1. Gray, Alonzo, "Elements of Chemistry:  Containing the Principles of the Science, both experimental and theoretical," 1840, Massachusetts, page 118
  2. Brainbridge, William Seaman, "Oxygen in Medicine and Surgery -- a contribution with report of cases," New York State Journal of Medicine, 1908Vol. 8, June, No. 6, pages 281-295
  3. Arthur, T.S., et al, editors,  "Oxygen, The Great Health Restorer," Arthurs Home Magazine, 1882, Philadelphia, page 770
  4. Stevens, Edward B. Stevens, John A. Murphy and Gustav C.E. Weber, editors, The Cincinnati Lancet & Observer, editorial, 1861, volume 4, Cleveland, page 564
  5. Smith, Andrew H. "The Inhalation of Oxygen in Acute Affections of the lungs," Trans Am Climatol Assoc, 1898, volume 14, page149-153
  6. "Oxygen," Madehow.com,  
  7. Glover, Dennis, "History of Respiratory therapy," 2010, Indiana, page 94
  8. Hess, Dean,  Neil MacIntyre, Shelley Misha,"Respiratory Care:  Principles and Practice," page 281
  9. Jindel, S.K., "Oxygen Therapy," 2008, pages 5-8
  10. Lane, Nick, "Oxygen:  The Molecule that Made the World," 2004, chapter 1, "Introduction: The elixer of life... and death," pages 1-15
  11. "Carbon Dioxide,"  Scienceclariied.com, http://www.scienceclarified.com/Ca-Ch/Carbon-Dioxide.html#b, observed the site on May 4, 2012 (this information is available at a variety of sources, although I chose to give sciencedaily.com credit)
For further reading check out History of Oxygen:  the first 150 years.  You can also buy "The history of respiratory therapy: Discovery and Evolution," by Dennis Glover.

To see pictures of the oxygen equipment described in this post check out dgrespiratory.com or http://dgrespiratory.com/oxygen

Tuesday, February 28, 2012

What is historical significance of succussion?

One of the first techniques ever devised to help physicians diagnose lung disease was succussion.  This is a technique where the physician would grab the patient by the shoulders, shaking the patient so any fluid that may have accumulated within his body -- particularly the lungs -- could be heard.

While this technique was probably used earlier, it didn't become a common procedure until it was described by Hippocrates at around 400 B.C.  Calvin Newton and Marshall Calkins, in their 1854 book, said:
"The term signifies a shaking; and the act consists in suddenly agitating a patient with the view of detecting the existence of fluid in some one of the cavities of the body, -- particularly, one of the pleural sacs (lungs). Seizing, by the shoulders, an individual, as he is ordinarily seated, strongly jolt or shock his whole frame. In this way, the sound of a contained fluid may sometimes be heard, like that of a liquid in a cask or bottle that is forcibly agitated. This has been called the metallic splash. Sometimes, the patient in bed is able to shake himself as to give the splashing sound of the water, in the thorax. The art was known to Hippocrates and has, hence, sometimes termed Hippocratic succussion."
Newton, however, explains that there was little reason to use this method because there were better techniques available to detect fluid inside the body, such as percussion and auscultation with a stethoscope, both of which had been well established by 1854.

In his book "On the Different Parts of Man," that disease is a result of an imbalance of the humors.  Respiratory diseases, particularly phthisis, pleurisy and pneumonia, was caused when an abundance of phlegm resulted in the fluxation, or flowing, of excessive phlegm to the lungs.  (2, page 239)

When the humours flowed to only one lung, this usually resulted in pleurisy and phthisis, which was in infection that resulted an infection, or pus, forming in the pleural cavity, or the space between the protective covering of the lungs and the lungs.  Hippocrates said "on shaking the body, we can perceive a fluctuation, and hear a sound. (2, page 239)

Succussion is no longer used by physicians for the same reason Newton described in his book.  Could you imagine a doctor shaking you like that?

References:

  1. Newton, Calvin, Marshall Calkins, "Thoracic diseases: their patterns, diagnosis and treatment" Worcester, published by D. and M. Calkins, page 89
  2. Coxe, John Redman, translator, "Hippocrates, the Writings of Hippocrates and Galen," 1846, http://oll.libertyfund.org/titles/1988, accessed 7/6/14, also see the book online at Google books, Philadelphia, Lindsay and Blakiston

Sunday, February 19, 2012

1761: Avenbrugger introduces chest percussion to medical profession

Joseph Avenbrugger (1722-1807) was not
the first physician to use chest percussion,
although he was the first to officially introduce
it to the medical profession in 1761. 
Hippocrates mentioned chest auscultation and succussion as far back as 400 B.C. thus introducing them to the medical profession. These techniques remained the only means of diagnosing diseases of the chest for greater than the next 2,600 years.

A new method called chest percussion was not described in 1761 by Joseph Leopold Avenbrugger (1722-1808),, and still not generally accepted until 1807, a year before Avenbrugger's death.

Auscultation is the process of listening to sounds within the body.  To hear lung and heart sounds, the physician would place his ear upon the patient's chest, a task that was gross on large sweaty people, especially women, uncomfortable for both the physician and patient, and which may place the physician at risk of catching the victim's disease.

Succussion is the process of shaking the patient.  This was described by Hippocrates described around 400 B.C. as a method of hearing puss move around in the lungs, thus allowing him to diagnose pleurisy.

Percussion is the process of tapping on a patients chest with a finger
to listen to the sounds emitted.  Physicians of today use the technique
as shown above, as it is gentler on the patient.  The presence of an
ongoing asthma attack, or air trapping, can be heard by the resonant
sound emitted.  
Percussion is the process of of gently tapping on the patient's skin to listen to the sounds emitted.  This would help the physician determine the size of an organ, and whether or not it was enlarged or diseased.

Percussion is Latin for to beat or to strike, and may have originally been used to describe the beating or striking of the first man-made instruments.  The technique may have been used as far back as the 17th century B.C. in Ancient Egypt. (1)

So while auscultation, succussion and percussion were taught in the ancient world, they were not routinely practiced until Avenbrugger learned about it by studying ancient accounts.  He then spent the next seven years silently and laboriously working on research to prove its usefulness. (1)(2, page 19)

Avenbrugger was born in Graets in Syria in 1722 to a hotel keeper who made sure his son received a good education at the University of Vienna.  At the age of 22 he became a physician at the Spanish Military Hospital where he worked for 10 years. (1)(2, page 19)

It was here he spent doing "observational and experimental studies (that) enabled him to discover that by tapping on the chest with the finger much important information with regard to diseased conditions within the chest might be obtained." (1)

In one experiment he inserted fluid into the lung of a corpse and then tapped on the chest to confirm if a dull sound was heard over the area the fluid was entered.  His studies confirmed his findings.  (1)

In other experiments he would tap on the chest to come up with a diagnosis, and when that patient died he would perform an autopsy to confirm his diagnosis.

So he learned that fluid, tumors, organs or other solid substances inside the body produced a dull sound, such as tapping over the heart or liver.  By tapping around an organ he could determine how large it was, and whether or not it was diseased.  He determined that fluid filled areas of the lungs also produced a dull sound, such as would be produced in pneumonia.  By using percussion he could not only determine that pneumonia was present, but where in the lung it was present. 

He also determined that hollow areas of the chest produced a high pitched sound, or what later physicians referred to as tympanic or resonant.  The removal of part of a lung would produce a high pitched sound when percussion was performed over that part of the lung. Emphysema and asthma may cause air to become trapped in the lungs, and therefore percussion of their chest will produce a high pitched sound.  So a skilled physician could diagnose asthma by percussion.

In 1761 he published his work in a 95 page booklet written in Latin called Inventum Novum ex percussione thoracis humani, ut signo abstrusos interni pectoris morbos detegendi, or "A new invention for discovering thoracic diseases by percussion of the chest."  In the book he credited his discovery to his father who would tap on kegs to determine how full they were.  (1) (2, page 19)(5, page 243)

A. Sakula, in his 1979 biography of Pierre Adolphe Piory, a man who would later help perect the art of percussion and auscultation, quoted Avenbrugger's description of how he performed his procedure. described the technique of percussion as follows: (4, page 576)
"Observation 2: Of the Method of Percussion.
IV. The thorax ought to be struck, slowlyand gently, with the points of the fingers brought close together and at the same time extended.
V. During percussion the shirt is to be drawn tight over the chest, or the hand of the operator covered with a glove made of unpolished leather. Scholium: If the naked chest is struck by the naked hand, the contact of the polished surfaces produces a kind of noise which alters or obscures the natural character of the sound." (4, page 576)
His booklet was translated into French, and then other languages, although, perhaps because he was a little known and modest physician, his idea was not well accepted by the medical community. (3, page 38) Regardless, the idea of percussion was officially introduced to the medical profession, and there was just enough interest aroused by his booklet to keep his idea alive.

Avenbrugger was later described as "a simple minded, kindly and unassuming junior physician at the Vienna Hospital.  (5, page 242)

Forty-six ears after his booklet was published, a physian several years younger than him by the name of Jean Nicolas Corvisant learned about Avenbrugger's work on percussion, and he performed experiments of his own on his patients.  He learned, as did Avenbrugger, that it was very useful in diagnosing diseases of the chest.

In 1807 he republished Avenbrugger's Inventum Novum, an this time the booklet was well received, perhaps because Corvisant had a good relationship with the dictator of France, Napoleon Bonaparte.  While had was not obligated, he humbly and modestly gave credit for the discovery to Avenbrugger.

Yet while Corvisant helped gain fame for Avenbruger's discovery of percussion, Corvisant's former student, Rene Laennec, helped further establish the discovery in the minds of physicians, first in France, and then throughout the world, by his 1819 book Mediate Auscultation.

In this book, Laennec wrote about how great a discovery chest percussion was. He said:  (6, page 3-4)
Nay, will go so far to assert, and without fear of contradiction from those hwo have been long accustomed to the examination  of dead bodies, -- that before the discovery of Avenbrugger, one half of the acute cases of peripneumon and pleurisy, and almost all the chronic pleurises, were mistaken by practitioners; and that, in such instances as the superior tact of a phsician enabled him to suspect the true nature of the disease, his conviction was rarely sufficiently storng of prompt and justify the application of very powerful remedies. The percussion of te chest, according to the method of the ingenious observer just mentioned, is one of the most valuable discoveries ever made in medicine. (6, page 3-4)
So Avenbrugger lived long enough to see his discovery accepted by his peers in France in 1807.  Of this, Laennec said: He died without  ever perhaps dreaming of the celebrity which his discovery was destined to obtain."  Avenbrugger passed away in 1808.  (6, page 19)

Further reading:
  1. Laennec, history of chest percussion
  2. Corvisant re-introduced chest percussion to medicine
  3. Percussion and stethoscope fine tuned
References:
  1. "The Catholic Encyclopedia, "Leopold Auenbrugger," http://www.newadvent.org/cathen/02072a.htm (1)
  2. Andral, G., notes to the works of Rene Laennec, "A treaties on the diseases of the chest, and on mediate auscultation," translated by John Forbes, 1838, New York, Philadelphia, Samuel S. and William Wood, Thomas Cowperthwaite and Company (10
  3. Williams, Henry Smith, "The Century's Progress in Scientific Medicine," Harper's Magazine, 1899, page 38
  4. Sakula, Alex., "Pierre Adolphe Piorry (1794-1879): pioneer of percussion and pleximetry," October, 1979, Thorax ( 34(5): 575–581).  (11)
  5. Dally, J.F. Halls, "Life and times of Jean Nicolas Corvisart" (1755-1821)," Proc R Soc Med., March, 1941, 34 (5), pages 239-246 (8)
  6. Laennec, Rene Theophile Hyacinthe, "A treaties on the diseases of the chest, and on mediate auscultation," translated by John Forbes, 1838, New York, Philadelphia, Samuel S. and William Wood, Thomas Cowperthwaite and Company (9)
  7. Sakula, Alex., "Pierre Adolphe Piorry (1794-1879): pioneer of percussion and pleximetry," October, 1979, Thorax ( 34(5): 575–581).  

Sunday, February 12, 2012

Asthma and Allergy History Timeline

30,000 B.C: Anyone who got short of breath generally toughed it out, although some experimented with various herbs and plants in an attempt to find relief. This is considered the dawn of medicine.

Pre-5,000 B.C. Most asthmatics had to tough it out, although if you were lucky you knew someone who was aware of an herbal remedy to drink or inhale. The most common remedy was to say a chant, or the soothing hand of a priest/doctor or family member. Keep in mind too that the term asthma was not used back then. Generally, the symptom was the disease: dysnpne, chest pain, cough, excess sputum, etc. All respiratory ailments, regardless of cause and seriousness, were treated the same. Pure asthma as we know it today was relatively rare. Those with illness were a burden to society, although many societies did the best they could to help you out.

3,000 -1,000 B.C Nei Ching was written by Huang Ti that described asthma-like symptoms and the use of the plant Ma Huang plant as a remedy. (In 1900 ephedrine was extracted from this plant.) Other treatment was steam and inhaled cinnamon

2640 B.C. King Menses is believed to have suffered a life threatening allergic reaction (anaphylaxic shock) when he was stung by bees. El-Razi observed redness and swelling of the nasal passages in some of his patients, and what he described in his writings were what we would now consider allergic rhinitis or hay fever.

2700 B.C.: The Hermetic books were written by the Egyptian god Thoth, or at least they were communicated to an Egyptian priests (perhaps Imhotep) who inscribed them in pillars of stone. The texts were necessary in order to provide credence and justification to priests/physicians who were seen as contributors to the black arts (evil arts) by their magic potions, remedies, chemistry, and pharmacology. The last six of these books contained all medical wisdom and rules that physicians were not allowed to deviate from. The disadvantage of these books is they discouraged physicians from being creative in treating patients, and therefore must have stalled the advancement of medicine.

2,600 B.C.: Imhotep, the vizier (consultant) to the King Djoser heals many ailments with his brilliant medical knowledge. He was so famous that he was later worshiped as a deity. He is remembered by history as the first physician (although he isn't really). As a scribe he recorded medical wisdom for other physicians and students, although none is known to have survived the test of time. Some, however, surmise he may have been the original writer of the Edwin Smith Papyrus, one of the oldest medical texts known to exist. It was found in the 19th century, possibly with the Georg Eber Papyrus (mentioned above), between the legs of a mummy in a tomb in the necropolis of Thebes.

1500 B.C. The Eber Papyrus was written by Ancient Egyptians and described asthma-like symptoms that were treated by burning herbs of belladonna on bricks and inhaling the fumes. Other treatment was eating elephant and crocodile dung, enemas, and herbs such as squill and henbane. A more common remedy would be to wear a magical amulet and say an incantation each morning. Another common remedy was to simply tough it out.

1500 B.C. Despite their proficiency at embalming, Egyptians were not permitted to study the human body for causes of disease or any other reason because this was considered offensive to the gods, and for this reason knowledge of anatomy was minimal at best. Ancient Egyptian physicians believed the heart continued to grow about two drachums in weight every year until a person was 50, and then it loses about two drachums a year until the person dies. So death was the result of continual loss of the heart. "They also believed about four demons ruled over the body. Hunger and thirst were not regarded as bodily wants but as quasi-poisonous substanes, which forced themselves into the body and required to be neutralized by eating and drinking, in order that the they might not destroy it. A similar superstition also prevailed regarding the dead, and thus these too required food.* The Egyptians were aware that the heart was the seat of all vessels in the body, and that the heart beat could be felt at various spots on the body. They were efficient in the art of surgery (as invented probably by Thoth), and were skilled in castration and circumcision. They were also very knowledgeable in diseases of women, the eyes, kidneys, etc. Each physician specialized in a specific condition of the body, such as disorders of the eyes, the kidneys, and anus. Other specialties included disorders of women, pregnancy and child bearing, etc. Temples were built where gods of health and healing were worshiped, and the sick would sleep there in hopes the god would appear and provide a vision of healing. These visions were interpreted by a priest. Those too sick to visit temples could send for a specialist to visit them at home. The Egyptians had a variety of drugs in their pharmacopoeia, including one containing dried and crushed roots and stems of the herb belladonna that was tossed on heated bricks and inhaled, and was probably the first inhaler. They were also privy to the poppy seed, or opium. They were aware of the need of good hygiene to stay healthy, and many used enemas and purgatives regularly to cleans the body. They also made ointments, oils, pills made of dough, and potions using various herbal recipes, although these were considered magical gifts offered by the gods. They also used steam for inhalations, and such fumigations were often utilized during disease outbreaks to ward off the evil causing the disease.

1500 B.C.? Moses grew up and was educated in Egypt, meaning he was probably adept in medical knowledge. As reported in the Bible, he, through God, recommended various methods of cleanliness and cleansing in order to prevent disease, which included avoidance of people with contagious diseases such as leprosy, and cleaning after touching animal carcases, etc. He did not mention asthma per se, although these efforts were meant to prevent all diseases. He must have known it was better to prevent disease, as once one was obtained it was nearly impossible to cure.

800 B.C. The term asthma was first used by Homer in his epic poem The Iliad. The term was used to describe anything that caused dyspnea (shortness of breath), including short of breath caused while running in a marathon. At this time in Ancient Greece asthma was considered a sacred disease that earned a visit from the gods, at least according to some historians.

400 B.C. Hippocrates becomes first to use asthma as a medical term in Corpus Hippocraticum, and was the first to treat it as a real disease state and not just a spiritual disease. He believed diseases were an imbalance of the 4 humors: blood, phlegm, yellow bile and black bile. His remedies included eating healthy, exercise, staying clean, and sleeping well. He also recommended avoiding quack medicine. If needed he recommended bleeding to balance the humors, massage, herbs and purging. Keep in mind, however, that he defined asthma as dyspnea. So asthma might be pure asthma, heart failure, kidney failure, bronchitis, or any other such disorder. He did however have a separate definition for tuberculosis.

315-240 BC. Erasistratus became the first to describe the valves of the heart. He described anatomy of the body.

100 A.D. Physicians in India had access to datura stramonium. They sun-dried the herb, crushed it, and smoked it in crude pipes to relieve asthma-like symptoms. They did not use the word asthma, however.

99-55 B.C. Lucretius was an ancient Roman physician who became the first to accurately describe allergies for the medical community. He is famous for the quote, "What is good for some may be fierce poisons for others." He was probably referring to allergies or, more specifically, what we now call allergens.

4-65 A.D. Seneca provided a great description of asthma, and wrote that asthmatics should be fortunate and not say things like "why me." No potions. No magic. No herbs. Seneca might have been one of the first asthma experts to recommend, mainly due to his own experiences, the importance of relaxing to control asthma.

41-55 A.D. Roman Emperor Claudius's son Brittanicus suffered from a reported "allergy" to horses. Because of his weakened condition his step brother Nero succeeded him to the throne, and Nero had his brother poisoned only a few months after his reign began.

25-50 AD Aurelius Cornelius Celsus was the first to describe asthma as the cause of dyspnea. He was the first to describe difficulty breathing and wheezing due to narrowed airways during an attack. When asthma comes out without a wheeze, it's dyspnea. When it comes out with a wheeze, it's asthma. He therefore was the first to define asthma as a disease of its own, even though his definition was mainly a more severe form of dyspnea.

32-79 AD Pliney the Elder's book "Science in the Ancient World" is written, and ultimately becomes one of the most widely read books in the world for the next 2,000 years. He described asthma and remedies such as blood of wild horses and eating snails.

100 A.D. Arateaus of Cappadocia wrote the first clear medical description of many diseases such as pleurisy, diphtheria, tetanus, pneumonia, diabetes epilepsy and asthma. He believed health was maintained by the balance pneuma, or "vital air." He used checking the pulse to see if the four humors were balanced. He may also have been the first to describe an asthmatic's yearning for cooler outside air.

150 A.D Galen became became the first to speculate on the cause of asthma. He was the first physician to make the connection between bronchial constriction and asthma. He also believed that vicious mucus flowed into the air passages and obstructed them. He wrote volumes on medicine, and his works were still read and believed for over 1500 years after his death. He was also the first to describe blood.

700 A.D.Chinese medicine in the form of the Nei Ching made it to Japan and was referred to as canpo, and asthma-like symptoms were referred to as zensoku

850 A.D. Physicians observed many of their patients developed sneezing, nasal stuffiness and runny noses when the roses were blooming. Upon further examination they observed redness and swelling in the nasal passages that resulted in the runny nose, and they referred to this condition as rose fever.

1198 Maimonides wrote a "Treaties on Asthma" recommended against trying any magical cures for any ailments, and any such remedies should treat the cause as opposed to just the symptoms. He described the disease as possibly seasonal, and he provided an accurate description of pollution in city air as a possible cause. He was the first to recommend chicken noodle soup as a remedy for breathing trouble and travel to dry regions.

1236 all the folk medicine of the day was compiled into one treaties called "Hyang-yak kugup pang" or "Emergency Remedies of Folk Medicine." It's the oldest medical texts written by a Korean. At about the same time several other such treaties were compiled, including "Samhwaja hyangyak pang," or "Folk Remedies of Samhwaja."This was mainly a diagnostic guide.

1280-1348 Xi is often regarded as the first Chinese physician to provide a modern description of asthma. He combined chuan and Xiao to come up with chuan xiao, which many historians believe is similar to the Western world's description of asthma. From this time on Chinese physicians believed Chuan xiao was caused by an imbalance of yin and yang.

1350 and 1400 A.D The medical term catarrh was first used to describe the miserable condition that result in a runny nose

1433 All previous Korean medical wisdom is compiled into "Hyangyak chipsong pang," or "Compilations of Native Korean Prescriptions."

1452-1485 King Richard III knew he had an allergy to strawberries and he used this knowledge to kill his enemy Lord William Hastings. The King purposely ate some strawberries and blamed his allergic reaction on a curse from Lord Hastings. Lord Hasting's was beheaded as punishment, and his head was served on a platter.

1514 Andreas Vesalius proved Galen was not a god, and that Galen dissected apes not humans. He believed the best teacher was human body, and he wrote the first accurate book of human anatomy.

1543 Vesalius publishes his book, "De humani corporis fabrica" and this is recognized by many as the birth of the scientific method, at least as far as our understanding of anatomy is concerned. The main method of science then was empirical (experience and observation). This was an essential moment in history as medicine slowly began changing from mere speculation to rational.

1550 Felix platerus (1536-1614 was among the first to advocate the treatment of mental patients. Back then asthma was considered a mental disorder. He believed that "an obstruction in the small pulmonary arteries is the cause of asthma. But he mentions also that the bigger nerves from the dorsal medulla, when disturbed by defluxions, occassion dyspnoea, e.g., in asthmatics. He observed the attack when nothing abnormal in the lungs could be found.

1602 William Henry proved the body circulates blood.

1609 Jean Baptiste van Helmont became the first to disagree with the theory of the 4 humors and instead described asthma as a disease of narrowing of the pipes of the lungs. He was also the first to describe the nervous theory of asthma. By his experiments he discovered carbon monoxide, but he didn't call it that.

1610, Korean philosopher Ho Chun compiled all the medical wisdom up to his time in "Tongui pogam," or "Exemplar of Korean Medicine."

1621 Paulo Zacchia published Quaestiones Medicolegales which provided the legal information about insanity. Asthma was considered to be a psychological disorder, and therefore it was believed asthmatics should be absolved of criminal inquiry because fear can trigger an asthma attack.

1656 A French doctor named Pierre Borel suspected one of his patients developed a rash when this patient ate eggs. So one day he attempted to test his theory by placing some egg particles on the patient's skin. When blisters developed on the patient's skin the physician knew he had made the correct diagnosis.

1661 Marcello Malpighi proved Henry right when he discovered vessels in the lungs that connected the arteries and the veins, and he called them capillaries.

1670 Paul Ammann published Medicina Critica which was a compilation of legal cases. Like Zacchio he recommended absolving asthmatics of crimes because fear might trigger an asthma attack.

1678 Thomas Willis became first to describe asthma as something other than disease of spirits, and he therefore narrowed the definition of asthma. He described it as obstruction of bronchi by thick humors, swelling of their walls and obstruction. He was first to describe asthma as more than dyspnea and wheezing, and therefore started the evolution of asthma to what it is today. He was the first to categorize all the diseases of asthma: pneumatic, convulsive and mixed. He's often the first to link food, emotion, heredity, and asthma.

1700 John Floyer rejected van Helmont and Willis as quacks and reconfirmed ideas of Galen and Hippocrates. He was more famous and readily accepted than the aforementioned. He wrote "Sir John Floyer's A Treatise on Asthma" and invented the pulse watch because he believed each disease was linked to a certain pulse

1700 Bernardino Ramazzini became the first to describe occupational asthma in bakers, tinsmiths, gilders, glass workers, runners professors (due to fumes), and horseback riders (dust). Recommended doctors ask about where a person works when they complain of shortness of breath.

1768 Savage described 17 different types of asthma because there were so many diseases categorized under asthma.

1790 pressurized aerosols were introduced in France to create carbonated beverages, the evolution of this product would influence the evolution of asthma rescue medicine in the 1940s and 50s.

1794 William Cullen was first to use science to describe asthma as spasmotic and nervous. He also describes inflammation of the lungs during an attack. He also described asthma as hereditary, effecting both sexes. He descried it coming on suddenly and noted it was short lived. He also wrote that asthma goes into remission, it effects different people differently, each person has unique triggers, and it's there for the whole life. He also described an array of asthma triggers including warm bathing, cold air, dust, odors and warm weather.

1797 Robert Bree wrote in favor of old humoral theories and tried to disprove the spasmotic theory of asthma. He believed spasms in lung were lungs natural mechanism to rid excess phlegm. His book remained popular the first half of the 19th century. He was among the first to recommend coffee in the treatment of asthma.

1800 George Lipscomb tried to prove Robert Bree wrong and Cullen right. He believed asthma was nervous and spasmotic.

1802 when Dr. James Anderson of the Royal Society of Physicians General at the Madras Hospital in India benefited from the treatment of asthma cigarettes containing stramonium, and reported this to his friend Dr. Sims in Edinburgh. (Asthma in the 19th century)

1803 the technique of inhaling dried and crushed stramonium in pipes was introduced to the West by an asthmatic doctor from Britain who visited India and found relief from an asthma cigarette. Asthma cigarettes and pipes became a popular treatment for asthma during the 19th century and through the 1950s.

1808 Franz Reisseisen performed experiments that proved muscular fibres wrap around the air tubes of the lungs

1812 Sims published a report in Edinbrugh Medical and Surgical Journal about the benefits of smoking cigarettes containing the leaves of Datura Strammonium. After this report asthma cigarettes became popular for the treatment of asthma.

1816 Rene Leannec invented the stethoscope and came up with the terms rhonchi and rhales. He believed asthma was caused by bronchospasm and catarrh (inflammation), although he believed this was all caused by some nervous stimuli.

1819 Dr. John Bostock further defined hay fever as a disease that caused inflammation of the upper respiratory tract that lead to the annoying symptoms. Ultimately, however, we would learn that the condition we now refer to as hay fever has nothing to do with hay or hay fever. Yet the term "hay fever" became a common term of describing a condition we now refer to as seasonal allergies.

1820s: Wealthy hay fever sufferers started participating in what became known as hay fever holidays.

1822 Richter reduced the categories under asthma to 11

1833 Atropine was first derived from the belladonna plant

1835 Ramadge wrote an essay supporting the nervous theory of asthma and made it popular. He described food as an asthma trigger and asthma being mostly a nocturnal disease. He discouraged use of opiates because they impede respirations that are already impeded. He recommended stramonium.

1836 Bergson and Lefevre wrote essays supporting the nervous theory of asthma and likewise popularized the movement. Lefevre described asthma could only be caused by bronchospasm, although this bronchospasm is caused by the mind.

1837 the first spray can was made of heavy steal in Perpigna. The can had a valve in it that allowed it to create the spray. Several prototypes were tested in 1862, although nothing ever came of it

1840 Charles J.B. Williams proved by his experiments that irritants caused bronchospasm. Budd rejected bronchospasm theory of asthma. He even doubted circular fibres that wrap around the lungs were muscular.

1841 Romberg confirmed Reissiessen's and Williams discovery by confirming galvanization of the lungs caused bronchospasm.

1842 Francois Achille Longet proved irritation of vagus nerve caused bronchospasm, confirming bronchospasm and nervous theory of asthma.

1843 George Hirsh said he (Hirsh) didn't understand how asthma could affect so many boys if it were a nervous disorder.

1846 Spirometry was invented by John Hutchinson.

1848 Rudolph A. von Killiker confirmed the works of Williams and Reisseissen when he isolated smooth muscles of the lungs

1851 Romberg described asthma as two different affections of the vagus nerve, and he called them bronchospasm and paralysis. Bergson denied paralytic asthma existed and he did experiments to prove asthma was only spasmotic

1851 Beau Cozart rejected asthma was a disease of bronchospasm and rejected the nervous theory. He insisted asthma was a disease caused by increased sputum in the lungs that was capable of blocking the air passages with mucus plugs.

1853 Jean Martin Charcot observed crystals in sputum. A hollowed out syringe referred to as the hypodermic needle was invented by Dr. Alexander Wood to make it easier to give blood transfusions to patients. It's one of the top ten inventions of all times.

1855 Dr. Ludwig Traube denied nervous asthma but believed asthma was rare and the dyspnea that resulted was caused by "fluxionary hyperaemia of the bronchial mucous membrane." He believed in swelling (inflammation) of the mucus membranes caused asthma.

1858 the first nebulzer was invented in France by Dr. Sales-Girons. It was pneumatic, fragile, and to cumbersome to become marketable.

1859 Bervenisti believed that a doctor could not possibly diagnose bronchospasm by listening to lung sounds alone. He believed sonorous and sibilant rhonchi are also present with a pulmonary embolism, which also causes dyspnea.

1860 Jean Antoine Villemin tried to disprove the nervous theory with his own scientific experiments. He believed hyperaemia (increased blood flow to the mucous membrane or inflammation) rapidly ensued, and led to the dyspnoeal attacks that other writers consider as nervous asthma. The chronic inflammation of the alveoli, described by Villemin, is, however, not recognized by other observers

1860 Henry Hyde Salter published his book "On Asthma." His book would ultimately become the main source for asthma teaching in the later half of the 19th century, making Salter the pre-eminent asthma expert of his day. He provided an accurate description of asthma, and defined it as a spasmotic disorder caused by a nervous affiliation.

1860 Bamberger believed asthma was caused by spasm of diaphragm

1861 Armand Trousseau described an attack after spending time in a hayloft. The attack followed an attack of hay fever. He observed cats and rabbits trigger asthma in some. He recommended stramonium, ether, chloroform, potassium nitrate fumes as remedies for asthma.

1864 Dr. Siegel invented Siegle’s steam spray inhaler that used the force of steam through a small tube to draw up the medicine and turn it into a vapour that is inhaled through a glass mouthpiece. Siegel's invention is often considered the beginning of nebulizer therapy.

1864 Alfred Wilhelm Volckman did experiments that once again verified the bronchospasm theory, yet he could find no evidence of the nervous link to asthma

1864 Henry Hyde Salter published his book "On Asthma: It's pathology and treatment," and supported the nervous and bronchspasm theory of asthma, he also provided a great description of asthma, it's causes and treatment. This book was the most popular on asthma in the 19th century. He also wrote about asthma as a hereditary disorder and a disease of inflammation.

1867 Atropine was isolated by von Bezold. It was then determined to be a component alkaloid of the various nightshade plants found in India often used in asthma cigarettes, It was then determined to be a component alkaloid of the various nightshade plants found in India, including the datura strammonium, atropa belladonna, and the hyoscyamus niger (black henbane), and Lobelia inflata

1869 Dr. Charles Blakely performed the first allergy test on himself in an attempt to study his own hay fever. He also proved allergies were caused by grass pollen and not hay (and also not roses, which are not bee pollinated and not wind pollinated).

1870 Biermer believed it was a disease of the bronchial tubes. Paul Bert, with improved methods of scientific research, succeeded in demonstrating that Willis and Longet were after all correct in their statements as to the contractility of the bronchial muscles.

1870 John Charles Thorowgood wrote about ozone paper that contained potash (potassium hydroxide) or potassium iodide and was smoked. He recommended smoking stramonium, chloroform, ether, nitre paper, sprays of lobelia and smoking belladonna.

1871 Ernst Victor von Leyden observed crystals in sputum and he linked them to asthma, although they weren't always in asthma sputum. Jean Martin Charcot observed these in 1853 but Leyden often gets credit because of his link to asthma. Sometimes they're referred to as Leyden-Charcot crystals (they were later identified as IgE particles.

1873 Leber wrote that he believed asthma was both disease of bronchial tubes and a disease spasming diaphragm. He believed asthma was caused by dilation of the blood vessels in the lungs. Nitre paper was recommended for treatment of asthma by Dr. John Thorowgood in the British Medical Journal.

1876 Dr. George Miller Beard wrote about the nervous theory of hay fever, something already suspected in the medical community (another baseless theory)

1878 J.B. Berkart explained that "ALL early historical traces of the affection at present called asthma are lost. For in the former systems of medicine, all cases presenting the same conspicuous symptoms were, regardless of their anatomical differences, considered as of a kindred nature, and grouped into classes according to imaginary types."

1879 Khella was used by local natives living in Eastern Mediterranean countries for quite a few years to treat asthma with some success. They made various "concoctions" from the seeds of the plant Amni Vasnaga, from which the substance Khellin was extracted. In the mid 20th century a synthetic version called disodium cromoglycate (cromolyn) was discovered and later was marketed as the Intal Spinhaler. Asthma cigarettes became a craze among asthmatics in America and Europe. Asthma pills and nitre paper also became popular for inhaling antispasmotics like strammonium, belladonna, atropine, Indian hemp, and cannabis.

1882 Heinrich Curshmann found spirals in sputum and suspected they caused bronchospasm because they were more often found in asthma sputum than Leyden crystals.Paul Ehrlich discovered the eosinophil

1884 M. Alton Wintrich proved bronchospasm and nervous theory of asthma as false. He believed tetanus of the muscles of respiration with spasm of the glottis or other muscles of respiration were the main causes of asthma. He believed asthma was caused by spasm of diaphragm.

1885 William Pepper and Louis Star explained that prior to the 19th century all dyspnea and all that wheezes was designated as asthma.

1886: The ampoule was invented by Frenh pharmaist Stanislas Limousin to help physicians conserve injectable solutions. This made it easier to preserve and transport medicinal solutions, which previously were prone to deteriorate due to the production of molds.

1889 Gollasch discovered eosinophilia in sputum

1890 Eosinophilia was found in the blood of asthmatics by Fink and Gabritschewsky

1892 William Osler defined asthma as a disease of inflammation and bronchospasm. He liked chloriform for temporary relief. He also prescribed morphine, belladonna, henbane, lobeline, and stramonium cigarettes. He also recommended Nitre paper. He may also have been one of the first to recommend for doctors to try oxygen. A preventative therapy was potassium iodide. Unlike some doctors, he recommended living in the city rather than the country.

1900 Epinepherine was discovered by a Japanese man names Jokichi Takamine. Cortisone was also discovered and Solis-Cohen prepared a crude extract of the adrenal gland and used it in the treatment of acute asthma." Willem Einthoven (the inventor of the EKG) evaluated the bronchospasm theory of asthma and spasming diaphragm theory of asthma and proved the bronchospasm theory. Due to these discoveries and others, the year 1900 is often marked as the birth of "effective" rational medicine. Prior to 1900 you may have been better off not seeking medical help.

1901 Epinepherine was trademarked under the name adrenaline. Also in this year Paul Portier and Charles Richet discovered that repeated exposure to extracted toxins from allergens would make a person sensitive to that allergen. Subsequent exposure to that toxin will cause an allergic reaction, and even death. He referred to this severe allergic reaction as anaphyxicis.

1902 Charles Richet discovered and defined the term anaphylaxis

1903 Epinepherine was first used on an asthma patient. It was given by injection. Isoproterenol is synthesized as the first modification of epinephrine, and marketed in the U.S. as Isuprel. It was also referred to as isopropyl adrenaline and marketed as Isoprenaline overseas.

1904: Dr. William Dunbar released to the market Pollantin, a serum he believed would cure hay fever. It was a salve or powder placed on mucous layers of eyes and nasal passages. It was called passive immunization.

1906 Clemons van Pirquet came up with the term allergy. It's from the Greek word allos (maning other). From then on asthma and allergies were considered relatives. Austrian pediatrician Clemons Von Pirquet coined the term allergy when he observed that some of his patients were hypersensitive to substances that did not bother other people. These substances were ultimately referred to as allergens. He was also the first to link allergies to asthma. We now know 75% of asthmatics have allergies.

1907 it's discovered epinephrine is a bronchodilator.

1909 Park, Davis & Co. introduced it's own line of ampoules of which it provided its soluble medicine in. It marketed the products as the Glaseptic Ampoule, which was supposed to prevent the need to worry about waiting for the solution to be sterilized and cooled, and guarantee proper dosing. The top of the ampoule was snapped off and the medicine drawn up with a hypodermic needle.

1910: Epinepherine was first given by nebulizer (probably by squeeze bulb syringe).

1910: Samuel James Meltzer performed studies in his lab and determined the symptoms of anaphylactic shock were similar to the symptoms of asthma. Both conditions result in shortness of breath due to spasms of the air passages in the lungs. He therefore postulated that asthma was not a nervous disorder, that it was an allergic disorder. He described how an asthmatic can become sensitized to certain substances, and then when exposed to those certain substances the air passages become hyper-reactive. This response is what results in an asthma attack.

1910: British scientists (Henry H. Dale and P.P. Laidlaw) discovered a chemical later called histamine (then called β-iminazolylethylamine) that was released during an allergic reaction, and determined it was this substance that was responsible for causing tissues to become inflamed. Dr. Brian Melland wrote an article for Lancet (May 21, 2010) discussing his successful experiments with hypodermic use of epinephrine for asthmatics. He also suggested the medicine worked because of its relaxing effect on smooth muscles lining the air passages in the lungs.

1911 Henry Dale discovered that histamine causes symptoms similar to aniphylactic shock. They later discovered it was elevated in allergic patients. Henry Dale proved that injecting histamine into guinea pigs and dogs would instigate the allergic response. Dr. John Freeman and Dr. Leonard Noon wrote about desensitization in the Lancet. The physicians "inoculated" a variety of patients with increasingly large doses of "pollen extract. It turned out others had already started using this method before 1911.

1916 several pharmaceuticals were marketing pollen extracts that could be used to do allergy testing, or as desensitization

1921 Carl Prausnitz discovered the antibody to be present in the serum of allergic patients. It could be transferred to nonallergic patients and was involved in the allergic process.

1918 Frances M. Rackemman publishes his report, " "A Clinical Study of One Hundred and Fifty Cases of Bronchial Asthma." He recommended asthma not be treated as just nervous or just allergic. He classified most cases of asthma as either extrinsic or intrinsic asthma. These two terms are still used to this day. He wrote over 175 writings about asthma and allergies.

1927 a Norwegian man named Erik Rotheim patented the first spray can that was capable of holding pressurized contents and spraying them. It's now considered the forerunner of modern spray cans, and ultimately the metered dose inhaler (MDI)

1929 the first glass nebulizers with bulb syringes for self nebulizing solutions of epinephrine are available.

1930s physicians stopped making house calls during this decade. However, when they did the homes of asthmatics were obvious by the strong odors of asthma cigarettes and incense and burnt niter paper. Aminophyllin and theophyllin (mild bronchodilators) production began. They would become a top line therapy for asthma and COPD through the 1990s when combination inhalers like Advair and Symbicort hit the market. It was also in this decate the electric nebulizer is invented and it becomes the first mass producible nebulizer for asthmatics to inhale the solution forms of various medicines like epinephrine and Isuprel.

1936 Iseotharine was introduced to the market as Bronkosol and marketed as a bronchodilator with fewer cardiac side effects as epinepherine. It's the first successful synthesized modification of epinephrine.

1937 Thanks to the works of Leonard Noon and John Freeman the first allergy shots were introduced to the market. They believed this would ultimately make the allergic person getting this treatment less sensitive to that substance over time. Daniel Bovet introduced to the world the first medicine to treat allergies, and he called his new medicine an antihistamine because it blocked the effects of histamine, and thus prevented an allergen from causing a stuffy and runny nose, itchy eyes and throat, and sneezing.

1939 Clark patents a DPI that resembles the ones we use today. It was used to inhale aluminum dust for those exposed to certain chemicals. It was never marketed.

1941 George Rieveschl discovered a drug called Benadryl that was useful in treating allergies

1944 Cortisol (steroid) was discovered to reduce inflammation in asthmatics lungs. Penicillin hit the market

1946 Antihystamines his the market (Benadryl and Pryibenzamine). In less than a decade they'd become the third most commonly prescribed medication behind antibiotics and barbituates. The first antihistamines were benadryl and pryibenzamine

1947 Hydrillin was introduced to the market. It was a combination of Benadryl and Aminophyllin.

1948 The terms beta adrenergic and alpha adrenergic were described by Raymond Ahlquis. Corticosteroids were discovered to benefit both asthmatics and allergy sufferers by treating inflammation.

1949 the Aerohaler was introduced as the first marketable DPI, and also the first rescue inhaler.

1949 Neohetramine was approved by FDA as the first over the counter antihistamine. Anahist and Inhiston were also available. Other antihistamines soon followed.

1951 Iseotharine (Bronkosol) approved by the FDA

1953 Mast cell is discovered. It's a cell that holds the mediators of inflammation that are released during an allergic reaction and cause all those nasty allergy symptoms.

1955 The first inhalers hit the market by Riker Laboratories to dispense perfume. Prednisone approved by the FDA for use in asthma and marketed as an effective treatment for acute asthma symptoms. It could be given in emergency rooms, or it could be given by pill form for patients to use at home. .

1956 Riker created the asthma inhaler market with a Medihaler-Epi that contained epinephrine and Medihaler-Iso that contained Isophrenaline.

1957 The Riker inhalers enter the market.

1958 Varaious steroids hit the market that were ultimately marketed under various brand names such as Dexamethasone (Decadron), Methylprednisolone (Medrol), and prednisolone. All were eventually available as a variety of brand names.

1960 Susphrine was introduced to the market as a longer acting version of epinephrine, lasting 6-8 hours

1960s Triamcinolone enters market as Azmacort

1961 Metaprateronol (Alupent) enters the market as Metaprel and Oriprenaline overseas. It was the first B2 specific rescue medicine that lasted more than 3-4 hours.

1960s Allen and hanbury introduced the Ventolin Rotacap to go along with the Ventolin Rotahaler as the first DPI albuterol product. The product was marketed throughout the 1980s and 1990s but was ultimately discontinued because some asthmatics who needed the rescue medicine had trouble generating enough flow to suck in the medicine.

1960 Allen & Hanbury marketed as Becotide as the first beclomethasone inhaler. It was only available outside the U.S. The recommended frequency was two puffs four times daily.

1963 the definition of allergy was refined by immunologist Phillip Gell and researcher Robin Coombs to refer to hypersensitivities to substances that result in immediate symptoms, such as hives, dyspnea, runny nose, sneezing, stuffiness, etc. Metaprateronol (Alupent) approved by FDA

1964 The first successful DPI is patented by Newton. The medicine he used was potassium chorate, a medicine that was more of an irritant than benefit to asthmatics. The device was never a marketing success, although Newton established the need for inhaled powders to be pulverized and kept dry.

1967 IgE antibodies are discovered, and later found to have a significant role in the allergic response.

1968 the Intal Spinhaler was introduced to the market. Albuterol inhaler enters the market as the first B2 selective agonist with minimal side effects that lasted 4-6 hours.

1976 Immunoglobulin E antibodies (IgE) antibodies were discovered.

1968 reports of patient abuse were made. Asthma deaths had risen, and the debate began whether deaths were due to the medicine or asthmatics over relying on their inhalers instead of seeking help. The debate continues to this day. IgE was discovered. The medicine disodium cromoglycate was isolated by Roger Altounyan marketed in the 1960s as the Intal Spinhaler.

1969 FDA decided to limit over the counter bronchodilators due to fears they were being abused. Epinepherine inhalers were grandfathered in and remained as over the counter medicines (primitine mist). Prescription refills for Epi-Iso plummeted 40 percent. The first successful dry powder inhalation system (Spinhaler) was introduced. The medicine was Chromolyn (Intal) and was an anti-inflammatory medicine that was not a steroid.

1970 terbutaline was introduced to the market. It was stronger than Iseotharine and lasted 4-6 hours. It was later available as an inhaler called Brethine or Bricanyl or Brethaire. It was learned (during this decade) that leukotrienes were the main culprits in causing inflammation of the bronchioles. Dr. Martin Wright invents peak flow meter that is inexpensive and portable

1971 Fison's Intal Spinhaler was approved by the FDA for the dispensing of disodium cromoglycate (cromolyn). The spinhaler was popular for asthma during the 1970s and 80s and even 1990s.

1972 inhaled corticosteroids almost written off as useful medicine until a study reported in The British Medical Journal in 1971 and 1972 showed the medicine was effective in controlling asthma

1975 a synthetic form of atropine, ipatropium bromide, was introduced to the market in Germany. It had fewer side effects than atropine.

1976 Metaproterenol was approved for use by asthmatics and was marketed as Alupent and Metaprel or sometimes oriprenaline. Fenoterol was marketed in New Zealand as the first long acting beta adrenergic (LABA). It was later determined to be responsible for a spike in asthma related deaths, although many suspect this was due to poor education and not so much the medicine itself.

1978 Chomolyn (Intal) hits the market as a nonsteroidal anti-inflammatory medicine (mast cell stabilizer). It was available as a dry powder inhaler given via the spinhaler. Ipatropium bromide is approved by the FDA and marketed as an inhaler and solution. Oxitropium bromide is likewise released as a longer acting anticholinergic, but not approved by the FDA.

1980s Pirbuterol (Maxair) autohaler was introduced as first breath actuated inhaler. It works in 5 minutes compared to Albuterols 15. Nervous theory of asthma was disproved. Growing concerns about the manner in which young people were inhaling or ingesting asthma cigarettes for their hallucinogenic properties led to their eventual disappearance from the market. Leukotriene antagonists were discovered and proven to block the effects of leukotrienes, which are believed to cause inflammation of the air passages of the lungs.

1981 Allen & Hansbury's Ventolin and Schering-Ploughs Proventil were approved by the the FDA

Fenoterol was repackaged in New Zealand with warnings and information about proper use, and the asthma death rate in the country subsided. Three brand names of terbutaline were approved by the FDA: Bricanyl, Brethaire, and Brethine. A DPI was available but not in the U.S.

1982 Albuterol (Salbutamol in some countries) was approved for use as a nebulizer solution and as an inhaler. It became the most popular asthma medicine of the 1980s and 1990. Azmacort was on the market. GlaxoSmithKline's version of beclomethasone was Vanceril, and Schering-Plough's version was Beclovent, and both were approved by the FDA for sale in the U.S

1982 Alupent became the only prescription drug switched to an over the counter drug because it was deemed safer and more effective than primitine mist. Due to risk of abuse and disputes with lawyers the drug was taken off the shelves within the same year. Aerobid (flunisolide) approved by FDA.

1984 Flunisolide (Aerobid) enters market as another inhaled corticosteroid (that tastes like rotten mints). Triamcinolome was approved by the FDA and marketed as Azmacort. The recommended frequency was 2-4 puffs four times daily.

1985? Theochron hit the market as the first slow release theophylline medicine. It was hard pressed to top the market for Theodur, the popular brand of theophylline on the market. In fact, my home doctor put me on Theochron, and my doctor at NJH/NAC took me off this medicine saying long acting bronchodilators are not for asthma.

1985 The inhalator DPI is on the market in Europe but is never approved by the FDA until it was later refined and marketed as the Foradil Centihaler in 2006. Inhalers, both rescue inhalers and inhaled corticosteroids, accounted for 25 percent of all prescriptions dispensed for the treatment of asthma

1986 Alupent patent ran out opening the door for generic and cheaper metaproterenol products.

1987 the chemical composition of Atropine was refined and Ipatropium Bromide (Atrovent) was introduced to the market. It was marketed as a medicine that dilated the lungs without the side effects of Atropine. Albuterol solution approved by FDA.

1987 Montreal protocol signed to phase out chlorofluorocarbons (CFC) as a propellant in asthma inhalers by 2000 because theory had it CFCs were damaging to the ozone.

1989 The patent on Albuterol ran out opening the door for cheaper generic Albuterol inhalers. National Heart Blood and Lung Institute created the first Asthma Guidelines for the diagnosis and management of asthma. For the first time all asthma experts would be on the same page, and all the latest evidence would be analyzed. A recommendation made by these guidelines was that inhaled corticosteroids should be a top line treatment to prevent and control asthma. As a result, sales of Aerobid (flunisolide) skyrocketed.

1990s Bitolterol (Tornalate) was introduced to market as having fast onset. Because it was simiilar to epinepherine, isoproterenol, and esoetharine it never caught on. Salmeterol (Serevent) was introduced to the market as the latest version of a long acting bronchodilator (similar to Albuterol).

1990s inhaled corticosteroids proven to be relatively safe for asthmatics. It was also proven that asthma is a disease of chronic inflammation. Studies verified that the small amount of steroid inhaled every day is much better and much safer than starting and stopping the medicine based on asthma symptoms. Inhaled corticosteroids became a front line treatment for asthma. For the first time asthma was treated as a preventable illness as opposed to simply treating acute symptoms.

1990s Combivent was introduced to the market as first combination inhaler (Albuterol and Atrovent). The cyclohaler DPI is made available in Europe and marketed as Salbutamol Cyclohaler and Salbutamol Cyclocaps.

1991 Aerochamber spacer device became the top selling spacer device on the market. In the first three months of this year sales of Aerobid sales double sales from previous year, and credit is given to the new asthma guidelines.

1992 GlaxoSmithKline's diskhaler was approved by the FDA. The original discus contained 4-8 blisters per cartridge, which made it so the patient didn't have to worry about handling each dose. Today's diskus contains a month supply of capsules that are made available to the patient by clicking a lever (i.e. Advair Diskuss). Nedicromil Sodium was approved by the FDA as the main alternative to the Intal Spinhaler. Purbuterol (Maxair) approved by FDA as first breath actuated rescue inhaler on the market.

1994 Salmeterol (Serevent) approved by the FDA as a safe LABA to be used to control asthma.

1995 Chromolyn was available as a solution to be nebulized, and this was ultimately a good option for pediatricians to prescribe for kids with asthma.Salbumin was the first HFA albuterol inhaler

1996 Duoneb and Combivent approved by the FDA. Fluticasone (Flovent) approved by the FDA. Proventil HFA was approved by the FDA

1997 Fluticasone Propionate (Flovent) on the market. It's a stronger and longer lasting inhaled corticosteroid as compared to beclomethasone dipropionate (Vanceril ) and Azmacort.

1997 Astra Zeneca's turbohaler was approved by the FDA and marketed as Pulmicort Turbohaler.

1998 Advair introduced to market. It contains a long acting bronchodilator salmeterol and inhaled corticosteroid fluticasone. Budesonide (Pulmicort) turbohaler introduced to market. Montelukast sodium approved by the FDA as the first leukotriene antagonist to prevent the allergic reaction in asthmatics. It's marketed as Singulair.

1999 Levalbuterol was introduced to the market as Xopenex. It was the first bronchodilator since epinepherine to have only the r-isomer. Zafirlocast (Accolate) approved by FDA as a a leukotriene antagonist to compete with Singulaiir. 17 unique brand names for ventolin are on the market including ProAirr, AccuNeb and Vospire.

2000 Symbicort released in Sweden. Flovent Diskus approved by FDA. Advair approved by the FDA. Pulmicort respules approved by the FDA as the first approved solution version of an inhaled corticosteroid. It's presently marketed for kids. The first HFA beclomethasone is approved by the FDA as Qvar. The inhaled particles are later realized to be finer and generate better lung distribution than CFC inhalers and DPIs. Liekotriene antagonists like Singulair on the market.

2001 terbutaline inhalers brethine and brethair were taken off the market, and so to was bitolterol. Symbicort available in Europe. Foradil Aerolizer was approved by the FDA and introduced to U.S. market. Formoterol was marketed in the U.S. Oxeze, Atock, Atimos and Performist were common names used overseas. A Ventolin HFA was approved by the FDA.

2002 Xopenex inhaler introduced. Spiriva introduced to the market as long acting version of Atrovent with even fewer side effects. It was later proven to improve lung function in COPD patients. All Ephedrine products were discontinued and the product line was phased out mainly due to fear people were abusing the medicine.

2002 QVAR patented as the first beclomethasone hfa inhaler. QVAR is proven to have smaller particle size than other inhaled corticosteroids fore deeper and more equal lung distribution, and it generally costs less than its competitors.

2003 Mometasone (Azmanex) dry powdered Twishaler introduced to market. A black box warning is placed on all long acting beta adrenergic products (LABA), which would ultimately include Foradil, Serevent, Advair, Symbicort, and Dulera. Tiatropium bromide (Spiriva) approved by the FDA and released in Europe and the U.S. Omalizumab is approved by the FDA as the first anti-IgE medication, and marketed as Xolair. It costs $10,000- 30,000 per dose. Purbuterol (Maxair) removed from market to to lack of acceptance.

2004 Ciclesonide (Alvesco) approved for sale in the U.S.and Australia. Flovent HFA inhaler approved by FDA

2005, the FDA released a health advisory warning of dangers of long acting beta adrenergics like Serevent, Formoterol (Foradil), Advair, Symbicort and later Dulera. Alvesco launched in the U.K and Germany.

2006 Serevent Discuss (salmeterol xinafoate)approved by FDA. The FDA approved the Foradil Centihaler which will be under patent until 2019. The recommended dose is two puffs of the inhaler twice daily or one puff on the DPI. Symbicort is marketed by AstraZeneca and approved by the FDA. Foradil centihaler approved by the FDA.

2007 Symbicort hits the market as competition to Advair. It contains formoterol (a quick acting and long acting bronchodilator) and inhaled corticosteroid budesonide. Zileuton approved by the FDA as another anti-leukotriene antagonist and marketed as Ziflo.

2008 there would be over 20 different DPIs on the market. Azmanex (mometasone furoate) approved by the FDA as the longest acting inhaled corticosteroid. It was marketed as the Azmanex Twisthaler (DPI). Salmeterol was linked with asthma related deaths and a black box warning was added to the labeling. Ziflo taken off the market.

2010 Metaproteronol was phased out as an option for asthma. Tilade, Alupent, Azmacort, Intal, Aerobid and Combivent are all phased out. A new corticosteroid/ long acting beta adrenergic combination inahler containing mometasone furoate and formoterol fumarate dihydrate is introduced to the market as a new competitor against Advair and Symbicort. Dulera approved by the FDA as a combination inhaler to compete with Advair and Symbicort. It contains mometasone furoate and formoterol. The patent for Advair expires.

2011 Primitine Mist, the last remaining over the counter bronchodilator, was removed from stores. The medicine used a CFC propellant and this gave the FDA an excuse to do what it was try ing to do for years, get bronchodilators off the shelves. The Pulmicort Turbohaler is phased out. In December 2011 the last remaining brand of the epinephrine inhaler is taken off the market, which means there are no longer any approved over the counter asthma rescue inhalers.

2012: The most popular inhaled corticosteroids are Aerobid, Azmacort, Qvar, Flovent and Azmanex. The two main bronchodilators are Albuterol and Levalbuterol. There are over 35 DPIs on the market. The Combivent Respimat approved by the FDA.

2013 Maxair set to be phased out
References:

*Baas, Johann Herman, author, Henry Ebenezer Sanderson, translator, "Outlines of the history of medicine and the medical profession," 1889, New York.  all other references can be found in the posts.