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Figure 4 Parametric images generated from strain rate data in two animals, one subjected to left anterior descending (LAD) and the other to right coronary artery (RCA) occlusion. Each manually delineated left ventricular wall (a and e) was divided into 10 segments (to increase the spatial resolution). Peak systolic strain rates (SSR) (b and f) and postsystolic-to-systolic strain rate ratio (IVRSR/SSR) (c and g) were calculated and used to generate corresponding parametric images. Ischemic myocardium was outlined as the region with reduced SSR, and IVRSR/SSR >1. Note the reduced systolic strain rates in the border zones, while the IVRSR/SSR is <1 in these segments. Panels d and h show the extent of perfusion defect at myocardial contrast echocardiography or postmortem staining.
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