Shallow Water Blackout
Shallow-water blackout refers to loss of consciousness due to hypoxia during a dive associated with a shallow depth in differing causative circumstances. The following situations may be referred to as shallow water blackout: * , blackout which occurs when all phases of a breathhold dive have taken place in shallow water (i.e., where depressurisation is not a significant factor). The mechanism for this type of shallow water blackout is lack of oxygen expedited by low carbon dioxide levels, as a consequence of voluntary hyperventilation before the dive. Blackouts which occur in swimming pools are probably driven only by excessive hyperventilation, with no significant influence from pressure change. * , loss of consciousness caused by lack of oxygen to the brain at the end of a deep breath-hold dive during the latter part of the ascent or immediately after surfacing. This is due to lowered oxygen partial pressure caused by a reduction in ambient pressure. Blackout in the shallow stage ...
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