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Figure 2 Representative force tracing from right ventricular (RV) and left ventricular (LV) endocardial trabeculae showing the responses to isoproterenol (1 µg/ml). Whereas responses were blunted in RV and LV muscle of medically managed transplanted hearts, left ventricular assist device (LVAD) support markedly improved responses in both ventricles similar to nonfailing hearts. Arrows = time when perfusion was switched to solution containing isoproterenol. Scale bar = 30 s.
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