Emergency treatment for decompression sickness involves maintaining blood pressure and administering oxygen. Fluids also may be given. The key to treatment is the use of a hyperbaric oxygen chamber, which is a high-pressure chamber in which the patient receives 100% oxygen. This treatment reverses the pressure changes that allowed gas bubbles to form and it drives nitrogen back into its liquid form so that it can be cleared more gradually over a period of hours. It is not recommended that divers with decompression sickness attempt to treat themselves with deep diving.