What is a key symptom of CNS O2 toxicity?

A key symptom of CNS O2 toxicity is irritability. When divers are exposed to high partial pressures of oxygen, particularly while diving at depths greater than 66 feet, the central nervous system can react adversely. This condition can manifest through various neurological symptoms, including behavioral changes. Irritability often emerges as a prominent indicator because it reflects the impact of the elevated oxygen levels on brain function.

Understanding the effects of oxygen on the central nervous system highlights the importance of monitoring divers for psychological and neurological signs when they are exposed to high oxygen environments. Recognizing irritability early in a dive situation can be crucial for preventing more severe complications associated with CNS oxygen toxicity, like seizures or loss of consciousness.

The other options may present symptoms in different respiratory or health-related issues, but they do not specifically indicate CNS O2 toxicity as directly as irritability does in this context.