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(A) Echocardiography before Langendorff experiment in sham hearts (top) and after 4 weeks of rapid ventricular pacing (bottom). (B) Cycle length (CL)-dependent effects on action potential duration (mean MAP90) under baseline conditions, after infusion of 300 µM erythromycin and after additional infusion of 0.75 µM verapamil. ⋆P < 0.05, significantly different from baseline values; #P < 0.05, significantly different from 300 µM erythromycin).
