Technically, a defibrillator is used to stop a heart from an ongoing fibrillation i.e a heart beating at a very high rate.
More importantly, as we see in the movies 'zapping the heart' is also used to start a heart that has stopped, may it be any reason.
A heart attack can stop the heart, if it is severe enough. Then defibrillators are used as the final resuscitation procedure.
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