Combat Dive Closed Circuit Diving Fundamentals Practice Exam

True or false: Oxygen toxicity can accompany confusion.

True False Not enough data Sometimes

Correct Answer:

True

Explanation:

Oxygen toxicity can accompany confusion because oxygen reaching the brain at high partial pressures can disrupt neural function. When the inspired oxygen partial pressure is elevated (as with deep dives using enriched air or rebreathers), CNS toxicity can occur, producing symptoms such as dizziness, vision changes, irritability, and confusion. Confusion is a recognized sign of CNS oxygen toxicity and can precede more serious events if exposure continues. So the statement is true. In practice, spotting confusion means reducing exposure to high-oxygen gas—ascend to shallower depth or switch to a gas with a lower oxygen fraction and follow appropriate safety steps.

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