Which condition is NOT a symptom of oxygen toxicity?

Extreme fatigue is not typically considered a symptom of oxygen toxicity. Oxygen toxicity primarily affects the central nervous system when the partial pressure of oxygen is excessively high, especially under certain conditions, such as deep diving with enriched air.

Visual distortions can occur as the high levels of oxygen affect the brain’s processing capabilities, leading to changes in vision. Seizures are one of the more severe manifestations of acute oxygen toxicity, particularly during dives at depths where the oxygen concentration is significantly elevated. Centric numbing sensations can also be symptoms, as elevated oxygen levels can alter nerve function.

While fatigue might occur during or after a dive for a variety of reasons such as dehydration or exertion, it is not a direct consequence of oxygen toxicity itself, making it the correct choice in this context. Understanding these distinctions can help divers manage their exposure to oxygen and recognize the signs of potential oxygen toxicity effectively.