Figure 1. Two-lead electrocardiogram recorded sequentially. (A) Preinduction of anesthesia (QT, 0.44 s; QTc, 0.50 s). (B) Premature ventricular contraction with marked prolonged QT interval (QT, 0.50 s; QTc, 0.57 s). (C) Torsade de pointes (TdP) terminated spontaneously. (D) After administration of nicorandil (QT, 0.54 s; QTc, 0.60 s).

Figure 1. Two-lead electrocardiogram recorded sequentially. (A) Preinduction of anesthesia (QT, 0.44 s; QTc, 0.50 s). (B) Premature ventricular contraction with marked prolonged QT interval (QT, 0.50 s; QTc, 0.57 s). (C) Torsade de pointes (TdP) terminated spontaneously. (D) After administration of nicorandil (QT, 0.54 s; QTc, 0.60 s).

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