What is a common indicator of CNS oxygen toxicity?

The presence of convulsions is a common indicator of central nervous system (CNS) oxygen toxicity, particularly in divers who are using high concentrations of oxygen during their dives. CNS oxygen toxicity can occur when oxygen is breathed at pressures greater than normal atmospheric pressure, leading to potentially harmful effects on the nervous system.

When oxygen levels are elevated for prolonged periods, it can increase the risk of seizures due to the neurotoxic effects of excess oxygen. Convulsions are a direct result of excitatory neurological activity and are a physiological response by the body to the toxic effects of oxygen on the brain. This condition typically arises at partial pressures above 1.6 ATA (atmospheres absolute), which divers need to be very cautious about when using high-level oxygen for breathing, particularly during deep or prolonged dives.

In contrast, while chest pain, distorted vision, and shortness of breath may be symptoms associated with diving or other medical conditions, they are not specifically linked to CNS oxygen toxicity in the same way that convulsions are. Understanding the risks of CNS oxygen toxicity is crucial for divers to prevent serious complications during high-oxygen partial pressure exposure.