Hyperbaric chambers treat altitude sickness by simulating a lower altitude. Its effects can last for up to 12 hours. This makes it particularly effective as a temporary treatment for altitude sickness in cases where an immediate descent is not possible.
The air pressure inside a hyperbaric chamber is increased artificially to create a contrast with the normal air pressure at a high altitude. This allows you to breathe in more oxygen than you would be able to breathe in outside of the bag.
After about two hours in the bag, the conditions mirror those of an elevation that is several thousand feet lower than the bag itself. This helps a person to temporarily acclimatize to high altitudes. It also reduces the severity of AMS so it’s possible to make a descent.
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