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Figure 4 Representative color M-mode and strain rate images at baseline (A), dobutamine without stenosis (B), and dobutamine (DOB) with stenosis (C). Despite similar increases in heart rate (HR), regional myocardial blood flow (RMBF) is reduced, and the dobutamine-induced increase in sSR and a decrease in TRL (B) significantly blunted in the presence (C) versus absence (B) of coronary stenosis. Other abbreviations as in Figure 2.
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