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Figure 7 Quantification of the biphasic response using strain rate imaging. This dobutamine echo was performed 3 months after anterior infarction. Resting images are in the upper left with 5 µg in the upper right, 10 µg in the lower left, and 40 µg in the lower right. The two-dimensional images (A) show a resting wall motion abnormality in the apical septal and lateral walls, both of which seem to improve at low dose and deteriorate at peak dose. Strain profiles (B) of the apical lateral segment show lengthening at rest, shortening at low dose, and lengthening at peak stress, and a similar pattern of augmentation and deterioration is apparent on the strain rate curves. There are no changes in the apical septal segment, consistent with infarction. Gadolinium-contrast magnetic resonance confirmed the presence of scar in the apex. For an accompanying video, please see the .
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