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Figure 8 Quantification of ischemic changes using strain rate imaging. In these views of a standard dobutamine echocardiograph, resting images are shown in the upper left, 10 µg in the upper right, 30 µg in the lower left, and 40 µg in the lower right. End-systolic frames of the apical two-chamber (A) and four-chamber (B) views are shown, inferior and septal walls are outlined, and stress-induced wall motion abnormalities in the basal inferior (A) and septal (B) segments are marked by arrows in the pre-peak and peak dose images. Strain and strain rate profiles in the basal inferior (C) and septal (D) segments show reduction of basal strain (<10%) and strain rate (<1/s) at peak stress, with no changes in the mid/apical segments. Coronary angiography (E) shows significant right coronary disease.