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Figure 4 (A), The percent WTh in 12 circumferential segments at the midventricular level in patients and control subjects. The strain variables, {epsilon}r (B) and {epsilon}c (C). In the control group, the mean value (thick dashed line with diamonds) ± 2 SD (thin dashed lines) is shown. In the infarct group, the mean value (thick line with triangles) is shown. Despite the fact that all patients had a major MI, in none of the 12 segments, the mean WTh (expressed as a percentage) in the infarct group was below the mean values ± 2 SD of the control group. For {epsilon}r and {epsilon}c, the same four segments were found to have reduced function, as compared with that of the control subjects. These segments were highly concordant with the septal and anterior regions of the ventricle (i.e., perfusion territory of the LAD) (see Fig. 2). {epsilon}c = circumferential shortening; {epsilon}r = radial stretch; LAD = left anterior descending coronary artery; WTh = wall thickening.