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Direct Identification of Subendocardial Postsystolic Thickening by Intracardiac M‐Mode Doppler Echocardiography

Figure 1. Intracardiac images of apical anterior (i.e., testing) wall in an experimental dog. A and B, M-mode gray scale and Doppler tissue images, respectively; C and D, M-mode gray scale and Doppler tissue images, respectively, from the same region after 2 weeks of experimentally induced stenosis of the left anterior descending coronary artery. The presence of additional motion towards the intracardiac transducer after systole suggests the occurrence of postsystolic thickening (PST). Progressive coronary stenosis1 was induced by ameroid placement on the left anterior coronary artery in two female dogs. A permanent catheter was placed in the left atrium to allow