Management of cardiac arrest. The algorithm of ventricular fibrillation or hypotensive ventricular tachycardia begins with defibrillation attempts, separated by 2 min of chest compressions. If that fails, it is followed by epinephrine or vasopressin (intravenous or intraosseous) and then antiarrhythmic drugs. CPR, cardiopulmonary resuscitation; VT, ventricular tachycardia. (Modified from Myerburg RJ, Castellanos A. Chap. 327, HPIM-19.)