Cardiac arrest is a sudden, unexpected loss of heart function, breathing, and consciousness. It occurs when the heart’s electrical system malfunctions, causing an irregular heartbeat (arrhythmia). This abnormal rhythm disrupts the heart’s ability to pump blood effectively to the body, leading to a sudden stop in circulation. Without immediate intervention, cardiac arrest can be fatal within minutes, resulting in brain damage or death. Prompt administration of cardiopulmonary resuscitation (CPR) and defibrillation with an automated external defibrillator (AED) are crucial in restoring the heart’s normal rhythm and increasing the chances of survival.