What is cardiac arrest?

Cardiac arrest: By definition, cardiac arrest is the cessation of normal circulation of the blood due to failure of the heart to contract..

Heart not pumping: Can be total non function= dead or more commonly ventricular fibrillation or tachycardia with no effective pumping and potential salvage with CPR and defibrillation. Or occasionally severe heart electrical block with slow slow pulse treated by pacing.

Arrest : Sudden arrest of heart function, usually either heart rhythm is abnormal or as a result of MI a large part of heart muscle dies.