It is the sudden cessation of normal circulation of the blood due to failure of the heart to contract effectively which may include a number of pathologies such as tachycardia (an extremely rapid heart beat which prevents the heart from effectively pumping blood), fibrillation (an irregular and ineffective heart rhythm), and asystole (the cessation of heart rhythm entirely).
A cardiac arrest is different from (but may be caused by) a heart attack, where blood flow to the muscle of the heart is impaired.
Cardiac Arrest prevents the supply of oxygen to the body via blood circulation, which may causes loss of consciousness and finally results in abnormal or absent breathing
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