Cardiac arrest is a medical emergency that can occur suddenly and without warning. It occurs when the heart stops working efficiently, which can cause blood flow to the brain and other vital organs to stop. Symptoms include sudden loss of responsiveness, absence of normal breathing, and loss of consciousness. Immediate medical intervention is crucial; survival largely depends on the promptness of administering CPR (cardiopulmonary resuscitation) and defibrillation. Cardiac arrest is a critical medical emergency that requires an immediate and effective response to improve the chance of patient survival and reduce the risk of long-term neurological damage.