Scuba Diving International (SDI) Computer Nitrox Practice Exam

What are the types of oxygen toxicity divers should know about?

1. Physical and mental toxicity

2. Pulmonary and Central Nervous System (CNS)

3. Acute and chronic toxicity

4. Nitrogen and helium toxicity

The correct answer is: Pulmonary and Central Nervous System (CNS)

Oxygen toxicity is a critical topic for divers, especially when using enriched air nitrox, which contains higher levels of oxygen than regular air. The correct identification of the types of oxygen toxicity that divers should be aware of is divided into Pulmonary toxicity and Central Nervous System (CNS) toxicity. Pulmonary toxicity occurs when a diver is exposed to high partial pressures of oxygen over extended periods. This can lead to damage in the lungs, potentially causing symptoms like chest pain, cough, or even pulmonary edema in severe cases. This type of toxicity is of particular concern during longer dives at depths where the effect of oxygen is magnified. Central Nervous System (CNS) toxicity relates to the acute effects of oxygen at elevated pressures. This can lead to neurological symptoms, including visual disturbances, seizures, and loss of consciousness. CNS toxicity can develop quickly, which is why it's crucial for divers to monitor their oxygen exposure closely, especially during deep dives or when using nitrox at high concentrations. Understanding these two types of oxygen toxicity allows divers to take appropriate precautions to mitigate risks during their dives, ensuring they can enjoy their experience safely while using enriched air nitrox.