What is the most severe symptom of CNS oxygen toxicity?

What is the most severe symptom of CNS oxygen toxicity?

• A. Headache
• B. Convulsions
• C. Nausea
• D. Seizures

Answer: (B)

CNS oxygen toxicity becomes most dangerous when the brain tips into convulsive activity. High oxygen levels make brain neurons hyperexcitable, and while early signs like headache or nausea show irritation, convulsions indicate full-blown, life-threatening CNS involvement. They reflect a dangerous progression that requires immediate action to reduce oxygen exposure and protect the diver. The other symptoms are milder warning signs that can occur before seizures, but they do not carry the same level of risk as a convulsive event.

CNS oxygen toxicity becomes most dangerous when the brain tips into convulsive activity. High oxygen levels make brain neurons hyperexcitable, and while early signs like headache or nausea show irritation, convulsions indicate full-blown, life-threatening CNS involvement. They reflect a dangerous progression that requires immediate action to reduce oxygen exposure and protect the diver. The other symptoms are milder warning signs that can occur before seizures, but they do not carry the same level of risk as a convulsive event.