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Figure 2 Normal and shear strains. At the left, a "nondeformed" myocardial cube is shown at end-diastole. The deformation of the cube at end-systole, shown at the right, can be analyzed by means of a combination of three normal strains (left) and three shear strains (right). CL-shear = circumferential–longitudinal shear strain; CR-shear = circumferential–radial shear strain; EPI = epicardium; LR-shear = longitudinal–radial shear strain.