两名患者于服用甲基多巴和狄高辛后发生症状性窦性心动过缓(心率35次/分以下)。虽然这两名患者有长期显著的高血压性心脏疾患和左心室衰竭,停药后经心电图和电生理学试验排除了原发性窦房结功能障碍。例 Two patients developed symptomatic sinus bradycardia (heart rate 35 beats / minute or less) after taking methyldopa and digoxin. Although these two patients had long-standing, significant hypertensive heart disease and left ventricular failure, ECG and electrophysiological tests after drug withdrawal precluded primary sinus node dysfunction. example