Which of the following is a sign of oxygen toxicity while diving?

Oxygen toxicity is a serious condition that can occur when divers breathe oxygen at pressures higher than those encountered at sea level, typically when using enriched air nitrox or during deep dives. One of the most severe and recognizable signs of oxygen toxicity is the occurrence of seizures.

When divers are exposed to high partial pressures of oxygen, the central nervous system can become overwhelmed, leading to neurological symptoms including seizures. This is critical to recognize, as seizures while diving can result in loss of consciousness or control, posing significant risks in an underwater environment.

While increased heart rate, nausea, and shortness of breath can also be symptoms associated with diving complications or other medical conditions, they are not specifically indicative of oxygen toxicity. Therefore, identifying seizures as a hallmark sign is essential for divers to understand the risks associated with oxygen exposure and to act promptly should they or a fellow diver experience these symptoms.