A man in his 60s was admitted to the hospital for evaluation of abdominal pain. The patient had a medical history of hypertension and pacemaker implantation several years prior for symptomatic sinus node dysfunction. The patient related a history of regular pacemaker checks, during which he had been informed that his device showed normal function. During the hospitalization the patient experienced considerable heart rate fluctuation. The patient was asymptomatic with respect to his cardiovascular system. His cardiovascular physical examination was also unremarkable. An electrocardiogram (ECG) was obtained as part of his evaluation (Figure), and the inpatient cardiology service was consulted for concern that the patient’s pacemaker was malfunctioning.

中文翻译：

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双腔起搏器可能出现设备故障

一名 60 多岁的男子因腹痛评估入院。患者有高血压病史，几年前因症状性窦房结功能障碍而植入心脏起搏器。患者讲述了定期检查起搏器的历史，在此期间他被告知他的设备显示正常功能。在住院期间，患者经历了相当大的心率波动。该患者的心血管系统没有任何症状。他的心血管体检也无异常。获得了心电图 (ECG) 作为他评估的一部分（图），并因担心患者的起搏器出现故障而咨询了住院心脏病学服务。