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Figure 3 Transmural contractile reserve as assessed for circumferential shortening (Ecc) and maximal shortening (E₂). (A) Radial thickening (Err) and maximal elongation (E₁). (B) In segments with subendocardial () and transmural extent (> of wall thickness) of infarct. open squares = rest; closed squares = dobutamine; black line = subendocardium; large dotted line = midwall; small dotted line = subepicardium. *p < 0.01 versus rest.