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Effects of dobutamine on the time to peak force and time to half-relaxation at 1 Hz. Percent changes in time to peak force (A) and time to half-relaxation (B) were significantly decreased by dobutamine treatment in myocardial strips isolated from nonoccluded and collateral-dependent regions of Sed compared with Ex pigs. Values are means ± SE; 15–20 animals/group. *P ≤ 0.05, dobutamine vs. control.
