This passes into the clonic phase, in which the extremities twitch and jerk.
2.
Central nervous system oxygen toxicity manifests as symptoms such as visual changes ( especially tunnel vision ), ringing in the ears ( tinnitus ), nausea, twitching ( especially of the face ), behavioural changes ( irritability, anxiety, confusion ), and clonic phase ).
3.
This has led to the current recommendation by the Diving Committee of the Undersea and Hyperbaric Medical Society that a diver should be raised during the seizure's clonic ( convulsive ) phase if the regulator is not in the diver's mouth as the danger of drowning is then greater than that of AGE but the ascent should be delayed until the end of the clonic phase otherwise.
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