RT Book, Section A1 Darby, Andrew E. A2 Crawford, Michael H. SR Print(0) ID 1139744836 T1 Sudden Cardiac Death T2 CURRENT Diagnosis & Treatment: Cardiology, 5e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259641251 LK accesscardiology.mhmedical.com/content.aspx?aid=1139744836 RD 2021/01/23 AB ESSENTIALS OF DIAGNOSISUnexpected death occurring within an hour of onset of symptoms.Primary electrical mechanisms include ventricular fibrillation, ventricular tachycardia, asystole, and pulseless electrical activity.