PADI Divemaster Certification Practice Exam

What are the two main types of oxygen toxicity?

1. Central nervous system and cardiac

2. CNS and pulmonary

3. Blood and tissue

4. Hydration and dehydration

The correct answer is: CNS and pulmonary

The two main types of oxygen toxicity are indeed classified as central nervous system (CNS) toxicity and pulmonary toxicity. CNS toxicity occurs when a diver is exposed to high partial pressures of oxygen, typically during deep dives or when using pure oxygen at high depths. The symptoms can include visual disturbances, twitching, seizures, and even loss of consciousness. This form of oxygen toxicity is particularly concerning during deep dives or when using equipment such as hyperbaric oxygen systems. Pulmonary toxicity, on the other hand, is related to the effects of prolonged exposure to elevated concentrations of oxygen, typically at lower pressures. It affects the lungs and can lead to symptoms such as coughing, chest pain, and difficulty breathing. This type of toxicity develops over time with higher oxygen exposures and poses a risk especially in scenarios where oxygen is used in elevated concentrations for extended periods, common in treatments or technical diving scenarios. Understanding these two forms of oxygen toxicity is essential for divers and dive professionals to mitigate risks associated with oxygen use and ensure safety during dives or oxygen therapies.