Cardiac arrest is an extremely critical heart condition. In a cardiac arrest, the heart abruptly stops pumping blood, which restricts blood flow to the brain and other vital organs in the body causing them to lose consciousness. The heart has an electrical system and function of its own which controls the rhythm of the heartbeat. A sudden cardiac arrest may occur as a result of the electrical disturbances or irregular heartbeat (arrhythmia). Physical stress, severe lack of oxygen, intense physic...