What can be a direct consequence of CNS O2 Toxicity during a dive?

CNS O2 toxicity, or central nervous system oxygen toxicity, occurs when divers are exposed to elevated partial pressures of oxygen, often during deep dives or when using oxygen-enriched mixtures. One of the most significant and alarming direct consequences of this condition is the occurrence of convulsions.

When oxygen levels become excessively high, particularly at pressures above 1.6 ATA, the central nervous system can become overstimulated, leading to various neurological disturbances. Convulsions can occur because the brain's electrical activity becomes disrupted, which can be triggered by hyperoxia, the condition of having too much oxygen in the body.

These convulsions pose significant risks while diving, as they can lead to loss of motor control, disorientation, or even unconsciousness, dramatically increasing the risk of drowning or other accidents underwater. Understanding the serious implications of CNS O2 toxicity is crucial for dive safety, as it emphasizes the need for careful monitoring of oxygen levels and adherence to safe dive practices.