Cardiac arrest

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A cardiac arrest (sometimes called a "heart attack") is the abrupt stop of normal circulation of blood due to failure of the heart to contract effectively during systole. Because the body is not getting enough oxygenated blood, cells start to die from oxygen starvation. Cerebral hypoxia (lack of oxygen to the brain) makes a person lose consciousness and stop breathing, and this makes the heart stop completely. Unless the person is also suffering from hypothermia, brain damage usually occurs after three to five minutes.

Cardiac arrest is a medical emergency that, in certain groups of patients, can be reversed if it is treated early enough. When cardiac arrest leads to a person's death, this is called sudden cardiac death (SCD). First aid treatment for cardiac arrest usually begins with cardiopulmonary resuscitation (CPR) to keep oxygenated blood flowing until medical treatment is available.