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To determine âcessation of all functions of the entire brain, including the brain stem,â physicians must determine the presence of unresponsive coma, the absence of brainstem reflexes, and the absence of respiratory drive after a CO 2 challenge.
3. How long can the brain go without oxygen before serious damage occurs? After five to ten minutes of not breathing, you are likely to develop serious and possibly irreversible brain damage. The one exception is when a younger person stops breathing and also becomes very cold at the same time. This can occur when a child is suddenly plunged into very cold water and drowns. In this situation, survival after more than 30 minutes has been known to occur. Return to the list of Frequently Asked Questions >>