Which action is included in the non-convulsive O2 toxicity management plan?

• A. abort dive/make controlled ascent and exhale through nose
• B. ignore symptoms and continue
• C. increase gas supply
• D. remove the mouthpiece and surface immediately

Answer: (A)

Non-convulsive oxygen toxicity is addressed by reducing exposure to high oxygen levels as soon as symptoms appear. The best step is to abort the dive and perform a controlled ascent to a shallower depth or to the surface, which lowers the partial pressure of oxygen the diver is breathing and allows the body to recover. As you ascend, keep breathing calmly and exhale through the nose to ensure complete ventilation and avoid breath-holding, which can prolong exposure. Ignoring symptoms, increasing the gas mix, or surfacing abruptly by removing the mouthpiece would not reduce O2 exposure and can be dangerous underwater.