Assertion: cardioverter defibrillator | /r/HasProperty | ventricular fibrillation
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text: A recent study by the National Heart, Lung, and Blood Institute demonstrated that implantable cardioverter-defibrillators are the treatment of choice instead of drug therapy for patients who have had a cardiac arrest or heart attack and are at risk for developing ventricular tachycardia , which is a very rapid heartbeat, or ventricular fibrillation , which is an ineffective, irregular heart activity.