The hyperbaric chamber is used in which scenario for carbon monoxide poisoning?

• A. Mild exposure
• B. Extreme cases
• C. Routine monitoring
• D. After breathing stabilization

Answer: (B)

Hyperbaric oxygen therapy is used when carbon monoxide poisoning is severe or presents with high risks of brain or tissue injury. Delivering 100% oxygen at high pressure rapidly increases dissolved oxygen in the blood and speeds the removal of CO from hemoglobin, which helps protect the brain and heart from hypoxia and lowers the chance of delayed neurologic sequelae. This makes it the preferred treatment in extreme scenarios such as altered mental status, unconsciousness, seizures, significant acidosis, or other high-risk features (including pregnancy). For mild exposures, plain high-flow oxygen is usually sufficient, and routine monitoring isn’t the trigger for hyperbaric therapy. Therapy is chosen based on severity and risk, not simply after stabilization, so extreme cases are the situation where hyperbaric treatment is indicated.