Cardiopulmonary resuscitation (CPR) is an emergency medical procedure for a victim of cardiac arrest or, in some circumstances, respiratory arrest.CPR is performed in hospitals, or in the community by laypersons or by emergency response professionals.
CPR is unlikely to restart the heart, but rather its purpose is to maintain a flow of oxygenated blood to the brain and the heart, thereby delaying tissue death and extending the brief window of opportunity for a successful resuscitation without permanent brain damage. Advanced life support (most commonly defibrillation) is usually needed to restart the heart. Defibrillation is not appropriate for 'flat line' (asystolic) patients, and in this instance, CPR can help bring a heart in to a shockable rhythm such as ventricular fibrillation or ventricular tachycardia.
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