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== Historical link to diving ==
Initially, HBOT was developed as a treatment for [[diving disorders]] involving bubbles of gas in the tissues, such as [[decompression sickness]] and [[gas embolism]]. The chamber cures decompression sickness and gas embolism in several ways:
* the increase in pressure in the chamber reduces the size of the gas bubbles improving transport of [[blood]] to tissues downstream of the bubbles
* the high concentrations of oxygen breathed by the casualty are beneficial in keeping oxygen-starved tissues alive
* the high concentrations of oxygen in the tissues have the effect of removing the [[nitrogen]] from the bubble making it smaller until it consists only of oxygen which is re-absorbed into the body
Bubbles are eventually eliminated by long exposure to pressure and high oxygen concentrations, allowing a gradual reduction of pressure back to atmospheric levels.
== Treatments ==
The [[slang]] term for a cycle of pressurization inside the HBO chamber is "a dive".
Emergency HBOT for [[diving disorders]] typically follows one of these two forms:
* for most cases, a shallow "dive" to a pressure the equivalent of 18 metres / 60 feet of water for 3 to 4.5 hours with the casualty breathing pure oxygen with air breaks every 20 minutes to reduce [[oxygen toxicity]]
* for extremely serious cases, a deeper "dive" to a pressure the equivalent of 37 metres / 122 feet of water for 4.5 hours with the casualty breathing air.
In [[Canada]] and the [[United States]], the U.S. Navy Dive Charts are used to determine the duration, pressure and [[breathing gas]] of the therapy. The most frequently used tables are Table 5 and Table 6. In the [[United Kingdom|UK]] the [[Royal Navy]] 62 and 67 tables are used.
An HBOT treatment for longer-term conditions is often a series of 20 to 40 "dives".
The [http://uhms.org Undersea and Hyperbaric Medical Society] (UHMS) publishes a "Committee Report" which compiles the latest research findings and contains information regarding the recommended duration and pressure of the longer-term conditions.
==Complications==
There are risks associated with HBOT, similar to some [[diving disorders]]:-
* Pressure changes can cause a 'squeeze' or [[barotrauma]] in the tissues surrounding trapped air inside the body, such as the [[lung]]s, behind the [[eardrum]], inside [[paranasal sinus]]es, or even trapped underneath [[dental]] fillings.
* Breathing high-pressure oxygen for long periods can causes [[oxygen toxicity]]. One of the side effects