In 1620 Dutch inventor Cornelius Drebbel invented the first true diving bell. It had an open bottom and relied on the pressure of water to keep air trapped within the bell. The bell would be lowered into the water by crane and had ballast to keep the bell properly oriented. Air was pumped into the bell by a hose to keep fresh air within while excess gases would leak out from under the lip of the bell. As the bell sank deeper more air was pumped inside to keep the occupants comfortable. The bell was never meant to move under the control of the divers but served as an underwater base for free divers.
The first documented used of hyperbaric therapy actually came before the discovery of oxygen. In 1662, British clergyman named Henshaw, used a system of organ bellows to change the atmospheric pressure in a sealed chamber called a domicilium. This domicilium could create both hyperbaric and hypobaric environments. Despite lacking any scientific basis for his theories, Henshaw believed that acute conditions would benefit from increased air pressure, while chronic conditions would respond better to decreased air pressure. According to Henshaw, “In times of good health this domicilium is proposed as a good expedient to help digestion, to promote insensible respiration, to facilitate breathing and expectoration, and consequently, of excellent use for the prevention of most afflictions of the lungs.” Henshaw was only providing increased and decreased air pressure without increasing oxygen concentration. Oxygen was not discovered until 1773 by Swedish pharmacist Carl Wilhelm Scheele, and the term “oxygen” was not coined until 1777 by French chemist Antoine Lavoisier.
Nearly two centuries later, in the 1830’s, there was a rebirth of interest in hyperbaric medicine in France. In 1834, French physician Junod built a hyperbaric chamber to treat pulmonary afflictions using pressures of 2-4 ATA and reported increased circulation to the internal organs, improvements in cerebral blood flow, and production of feelings of well being. Then, in 1837, Pravaz built the largest hyperbaric chamber of that time and was used to treat patients with pulmonary conditions including tuberculosis, laryngitis, tracheitis and pertussis, as well unrelated conditoins such as cholera, conjunctivitis, deafness, menorrhagia and rickets.
In 1860, the first hyperbaric chamber on the North American continent was constructed in Oshawa, Ontario, Canada. A year later, Corning built the first hyperbaric chamber in the United States in New York. This chamber was used to treat ‘nervous and related disorders’.
In 1885, C. Theodore Williams commented in an article “Lectures on the Compressed Air Bath and its Uses in the Treatment of Disease” the British Medical Journal, “The use of atmospheric air under different degrees of atmospheric pressure, in the treatment of disease, is one of the most important advances in modern medicine and when we consider the simplicity of the agent, the exact methods by which it may be applied, and the precision with which it can be regulated to the requirements of each individual, we are astonished that in England this method of treatment has been so little used”.
The growing awareness of Dr. Cunningham’s treatments prompted repeated request by the Bureau of Investigations of the American Medical Association (AMA) to validate his claims regarding the effectiveness of hyperbaric therapy. Some believe he simply didn’t want to share or cooperate with the AMA and others believed he was a total fraud. The chamber dismantled in 1937 and sold for scrap metal during World War II.
Drager was the first to explore the use of pressurized oxygen in decompression sickness. His protocols were put into practice by Behnke and Shaw in the late 1930s. In 1939, the US Navy began treating divers suffering decompression sickness with hyperbaric oxygen therapy. This was different than all of the previous uses of hyperbaric therapy which only used compressed air.
After World War II, the US military conducted research which brought greater knowledge about survivable pressures. As a result, throughout the late 1950s and early 1960s, the use of HBOT (or HBO) increased.
In the 1950s, Ite Boerema of the Netherlands conceived the idea of “flooding” the body’s tissues with extra oxygen. Cardiac surgeon Boerema worked with the Royal Dutch Navy in a number of animal experiments with surgery inside a hyperbaric oxygen chamber. His results were so successful that a large operating hyperbaric chamber room was built at the University of Amsterdam where he would perform a number of complicated heart and lung operations. Boerema and his team were the first ever to treat Clostridial Myonecrosis (Gas Gangrene) with HBOT using an experimental pig. Boerema published, “Life without blood,” a report of fatally anemic pigs treated successfully with HBOT. These pigs were able to thrive within the hyperbaric chamber even in the complete absence of circulating red blood cells.
The Undersea Medical Society, an organization made up largely of Navy and ex-Navy physicians, was founded in 1967 in the USA. This non-profit organization is now known as the Undersea and Hyperbaric Medical Society (UHMS). And with concerns of the lack of scientific progress and regulation, the UHMS formed a Committee on Hyperbaric Oxygen Therapy in the late 1970s and systematically reviewed all the available scientific evidence for HBOT. They came up with a list of conditions for which HBOT was likely beneficial. This list was accepted by insurance providers, including Medicare.
In 1972, Dr. Richard A. Neubauer opened the Ocean Hyperbaric Neurologic Center in Lauderdale by the Sea. Throughout his life, despite being viewed with suspicion by skeptics, Dr. Neubauer continued to treat and report the effectiveness of hyperbaric oxygen therapy in the management of various central nervous system disorders. Neubauer is considered the grandfather of HBOT in Neurology.
Dr. Paul Harch began an in-depth study of brain decompression illness (DCI) and evaluated divers with this disorder. Two diving cases confirmed what became obvious to Harch; it was not residual gas being treated rather ischemic brain injury.
In 1990, former microbiology professor Igor Gamow invented and patented the Gamow Bag. The low pressure hyperbaric bag provided high altitude climbers with an effective method to treat high altitude sickness or AMS. Designed to fit a single person inside, this portable hyperbaric chamber was pressurized with a foot pump to about 2 pounds per square inch of pressure. The Bag simulates a descent of as much as 7,000 feet.
Today, thousands of hyperbaric oxygen therapy clinics dot the globe with traditional hard-shell hyperbaric chambers and soft-shell, portable hyperbaric chambers. More and more people are becoming aware of the many benefits of HBOT. With the ongoing studies, research and success of HBOT for many conditions, such as autism, TBI, stroke, it’s curious as to why the UHMS and FDA, for many years now, have not added to the list of approved conditions.