<unk>  is a state of no cardiac electrical activity, hence no contractions of the myocardium and no cardiac output or blood flow.<unk>  is one of the conditions required for a medical practitioner to certify death.
In<unk> , the heart will not respond to defibrillation because it is already depolarized, however some emergency physicians advocate a trial of defibrillation in case the rhythm is actually fine ventricular fibrillation, although little evidence exists to support the practice.<unk>  is usually a confirmation of death as opposed to a heart rhythm to be treated, although a small minority of patients are successfully resuscitated, if the underlying cause is identified and treated immediately.
Asystole
Wide complex tachycardia
Junctional tachycardia
Junctional rhythm
Idioventricular rhythm
Junctional bradycardia
Narrow complex tachycardia
Right bundle branch block