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Figure 4 Scatterplot of the relation between the tissue Doppler imaging parameters and strain by sonomicrometry and segment work as reference methods. Systolic strain and displacement showed excellent correlation with both reference methods. Although there were significant correlations between systolic velocity and both reference methods, velocity could not separate passive (negative work) from active (positive work) segments. Systolic strain and displacement, however, differentiated well between active and passive segments. Open circles = baseline; solid squares = left anterior descending coronary artery stenosis; solid triangles = left anterior descending coronary artery occlusion.