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Figure 5 CRT Nonresponse Due to Extensive Scar

Scar imaging from a subject with significant circumferential dyssynchrony but CRT nonresponse shows extensive left ventricular scar on long-(A) and short-axis (B) images. This underscores the importance of CMR relative to echocardiography in the assessment of CRT candidates. Not only does MR-MT provide a very accurate measure of dyssynchrony, but the scar imaging data provide important information regarding the myocardial substrate such as extent and distribution of scar. Abbreviations as in Figures 1 and 3.