患者,男,54岁。血压12/8kPa(90/60mmHg)胸闷、乏力、头昏4个月。活动中突发晕厥,5分钟后神志清醒,心率40次/分。重度房室传导阻滞治疗可用()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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