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A member asked:
Hyperventilation. how fast can someone pass out if hyperventilating?
A doctor has provided 1 answer
Varies: This varies from person to person ranging from fast to not being able to fully pass out. When one hyperventilates, the arterial carbon dioxide level drops, this causes a physiologic decrease in blood flow to the brain, and depending on the person, they may pass out due to decreased blood flow similar to a fainting episode. Don't try this alone or while standing.
Answered 1/5/2020
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