Hyperbaric oxygen treatment (HBOT) is a 100% oxygen inhalation treatment inside a hyperbaric chamber. The patient is seated or lying in a hyperbaric chamber which is compressed to an overpressure of 2 bars. Oxygen is breathed through a mask, hood or tracheostomy tube. Depending on the disease, treatment lasts 90 to 300 minutes or more. It may be necessary to repeat the treatment several times a day.(more)