Influenza causes cardiac and pulmonary complications that can lead to death. Its effect on the conduction system, first described a century ago, has long been thought to be fairly benign. We report 2 cases of high-grade atrioventricular block associated with acute influenza infection. Both patients—a 50-year-old woman with no history of cardiac disease or conduction abnormalities and a 20-year-old man with a history of complex congenital heart disease and conduction abnormalities—received a permanent pacemaker. In the first case, pacemaker interrogation at 4 months revealed persistent atrioventricular block. In the second case, pacemaker interrogation at 3 months suggested resolution. Whether such influenza-associated changes are transient or permanent remains unknown. We recommend keeping a careful watch on influenza patients with cardiac rhythm abnormalities and monitoring them closely to see if the problem resolves.

流感会导致心脏和肺部并发症，甚至导致死亡。早在一个世纪前就已描述了它对传导系统的影响，长期以来一直被认为是良性的。我们报告2例与急性流感感染相关的高度房室传导阻滞。两名患者（一名无心脏病或传导异常史的50岁女性和一名有复杂的先天性心脏病和传导异常史的20岁男性）接受了永久性起搏器治疗。在第一种情况下，在4个月时对心脏起搏器的检查显示出持续的房室传导阻滞。在第二种情况下，在3个月时对心脏起搏器进行审讯建议解决。此类与流感相关的变化是暂时的还是永久的仍然未知。