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Quinidine (10 µmol/L) reverses the effects of PD-118057 to abbreviate QT interval and effective refractory period, but not its effects to augment transmural dispersion of repolarization (TDR). Basic cycle length = 2000 ms. Epicardial stimulation. * p<0.05 vs. Control. † p<0.001 vs. PD-118057.
