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Transcript
Figure-of-eight model of reentry. Isochronal activation map during monomorphic reentrant ventricular tachycardia occurring in the surviving epicardial layer overlying an infarction. Recordings were obtained from the epicardial surface of a canine heart 4 days after ligation of the left anterior descending coronary artery. Activation isochrones are drawn at 20-ms intervals. The reentrant circuit has a characteristic figure-of-eight activation pattern. Two circulating wavefronts advance in clockwise and counterclockwise directions, respectively, around two zones (arcs) of conduction block (heavy solid lines). The epicardial surface is depicted as if the ventricles were unfolded following a cut from the crux to the apex. A three-dimensional diagrammatic illustration of the ventricular activation pattern during the reentrant tachycardia is shown in the lower panel. END, endocardium; EPI, epicardium; LV, left ventricle; RV, Source: Chapter 38. Mechanisms of Cardiac Arrhythmias and Conduction Disturbances, Hurst's The Heart, 13e right ventricle. Reproduced with permission from El-Sherif N. Reentry revisited. PACE. 1988;11:1358. Citation: Fuster V, Walsh RA, Harrington RA. Hurst's The Heart, 13e; 2011 Available at: http://mhmedical.com/ Accessed: May 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved