As a medical professional with expertise in neurology and emergency medicine, I can provide insight into the effects of oxygen deprivation on the brain. The brain is one of the most sensitive organs when it comes to oxygen supply. It's known that the brain can survive for up to about six minutes after the heart stops. This is the critical time frame within which CPR (cardiopulmonary resuscitation) should ideally be initiated. If CPR is started within six minutes of cardiac arrest, there's a chance that the brain can withstand the lack of oxygen without severe damage. However, after about six minutes without CPR, irreversible damage to the brain begins to occur. read more >>

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.read more >>