What is the recommended action if convulsions occur during CNS Oxygen Toxicity?

• A. Abort the dive and surface with buddy rescue.
• B. Continue the dive, increasing depth to control convulsions.
• C. Descend to deeper depth to reduce symptoms.
• D. Hold breath and wait for symptoms to pass.

Answer: (A)

CNS oxygen toxicity provokes seizures that interrupt breathing and control, making it unsafe to remain underwater. The problem comes from high oxygen partial pressures at depth, so continuing the dive or descending deeper would keep exposing the diver to the toxic level and worsen the risk. The safest course is to abort the dive and surface as quickly as possible with buddy assistance to ensure a controlled ascent and safe recovery at the surface. Holding the breath during a seizure is dangerous and can lead to lung injury or drowning, so continuation isn’t an option. After surfacing, seek medical evaluation and treat with supplemental oxygen as available.