Shallow water blackout occurs when:

A) voluntary hypoventilation causes a drop in the PaO2.
B) cerebral vasodilation causes syncope during ascent.
C) a decreasing PaO2 during descent results in syncope.
D) a swimmer hyperventilates prior to entering the water.


Answer: D) a swimmer hyperventilates prior to entering the water.

Environmental & Atmospheric Sciences

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