by Tim Peever
Some Physiological Factors and Possible Controls of Oxygen Toxicity
Oxygen Toxicity manifests itself in two ways, pulmonary oxygen toxicity and central nervous system (CNS) oxygen toxicity. Of these, CNS oxygen toxicity is the most serious concern to scuba divers.
Pulmonary oxygen toxicity involves attack on the gas transfer membranes in the lungs by oxygen free radicals from long-term exposure to high partial pressures of oxygen. The time involved to manifest symptoms of pulmonary oxygen toxicity is many hours and would not affect a diver except in cases of recompression therapy.