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患者女性，74岁，因临床症状、组织学检查结果和幽门螺杆菌（Hp）阳性诊断慢性十二指肠溃疡入院，并因心动过速－心动过缓综合征而应用两吡胺（disopyramide）200mg，每日2次，治疗7年。在这段期间校正QT间期（QTc）从未超过正常范围的上限（440ms）。入院心电图显示窦性心律，
A 74-year-old patient diagnosed with chronic duodenal ulcer due to clinical symptoms, histological findings and H. pylori (Hp) was admitted to hospital and was treated for two episodes of disopyramide due to tachycardia-bradycardia syndrome. 200mg, 2 times a day for 7 years. The corrected QT interval (QTc) never exceeded the upper limit of the normal range (440 ms) during this period. Admission electrocardiogram shows sinus rhythm,