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Asked by matasef4079 - 4 years ago
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morrie Level 52
Answered 4 years ago
5 minutes. Read this article to learn about anoxic brain injury.
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joensf Level 82
Answered 4 years ago
CPR is only likely to be effective if commenced within 6 minutes after the blood flow stops, because permanent brain cell damage occurs when fresh blood infuses the cells after that time, because the cells of the brain become dormant in as little as 4-6 minutes in an oxygen deprived environment, and the cells are unable to survive the reintroduction of oxygen in a traditional resuscitation.

The brain can survive for up to about six minutes after the heart stops. The reason to learn cardiopulmonary resuscitation (CPR) is that if CPR is started within six minutes of cardiac arrest, the brain may survive the lack of oxygen. After about six minutes without CPR, however, the brain begins to die, and there may be lasting effects even with subsequent recovery. Medication and mechanical ventilation permit tissue oxygenation, but severe brain damage or a prolonged period without oxygen or glucose causes the death of the brain. By definition, brain death is when the entire brain, including the brain stem, has irreversibly lost all function.
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