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Electroanatomic voltage map of the left ventricle in a patient with sustained monomorphic ventricular tachycardia (VT) caused by an old anterior wall myocardial infarction. Right anterior oblique (RAO) and left anterior oblique (LAO) projections are shown. In contrast to the maps shown in Figs. 44-5 and 44–6, the color coding indicates the bipolar voltage acquired at each point in the map during sinus rhythm. Normal voltage is that above 1.5 mV and is purple. Voltage progressively decreases as colors proceed to blue, green, yellow, orange, and red. The large low-voltage region is consistent with a prior anteroseptal infarction. Additional pacing at sites in the infarct region (red and yellow spheres) suggests a broad channel for conduction with exits at the superior and inferior margins of the infarct region. Thus, the arrhythmia substrate was identified during stable sinus rhythm. A series of radiofrequency Source: Chapter 44. Electrophysiology and Catheter-Ablative Techniques, Hurst's The Heart, 13e lesions placed through the presumptive channel region (maroon spheres) abolished inducible VT. 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
