A. The algorithm of ventricular fibrillation or pulseless ventricular tachycardia begins with and initial defibrillate on attempt. If a single shock fails.

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A. The algorithm of ventricular fibrillation or pulseless ventricular tachycardia begins with and initial defibrillate on attempt. If a single shock fails to restore a pulse, it is followed by 2 min of cardiopulmonary resuscitation (CPR; chest compressions), followed by another single shock. After three such sequences, epinephrine and then antiarrhythmic drugs are added to the protocol. See text for details. B. The algorithms for bradyarrhythmia/asystole (left) or pulseless electrical activity (right) are dominated first by continued life support and a search for reversible causes. Subsequent therapy is nonspecific and is accompanied by a low success rate. See text for details. MI, myocardial infarction; VT, ventricular tachycardia. Source: Cardiovascular Collapse, Cardiac Arrest, and Sudden Cardiac Death, Harrison's Principles of Internal Medicine, 19e Citation: Kasper D, Fauci A, Hauser S, Longo D, Jameson J, Loscalzo J. Harrison's Principles of Internal Medicine, 19e; 2015 Available at: https://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1130/kas_ch327_f003a.png&sec=98725546&BookID=1130&ChapterSecID=79745986&imagename= Accessed: October 19, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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