Central nervous system oxygen toxicity tends to occur only at high pressure, so it is primarily a problem for divers and others who spend time in conditions higher than atmospheric pressure. When a scuba diver progresses deeper into the water, the partial pressure of any gases in his tank increase in proportion to his depth. Central nervous system oxygen toxicity, then, is possible at sufficient depths as the diver breathes oxygen at significantly higher than normal atmospheric pressure. This can lead to a wide variety of symptoms, including nausea; dizziness; twitching; and in severe cases, seizures and possible death.
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