Side effects of HBOT include barotrauma to the ears and sinuses caused by pressure changes. Other side effects are rare but may be more serious, including oxygen toxicity and accelerated growth of cataracts. Some people may experience claustrophobia, if they are prone to that sort of reaction. Some patients experience visual changes after several treatments. Temporarily blurred vision can be caused by swelling of the lens. This is usually temporary and disappears within two weeks to 4 weeks, but in some cases three to four months after treatment is finished.
Critically ill and/or emergency patients may be provided with mechanical ventilation, IV therapy, and invasive and noninvasive physiologic monitoring.
Other possible side effects include rising blood sugar levels, increased blood pressure, abdominal pain and dizziness.10