Unidad de Arritmias, Departamento de Cardiología, Hospital Espanol de Mendoza, Argentina.
Cardiol J. 2009;16(6):582-4.
Trifascicular block, which consists of impaired conduction in the three main fascicles of the ventricular conduction system, may progress to high-grade or complete atrioventricular block. Exceptionally, it is possible to register in the same patient paroxysmal alternating atrioventricular block and bilateral bundle branch block. This is the electrocardiogram of a male, 60 year-old patient coming from an endemic area, with positive serology for Chagas disease, with the exclusively dromotropic form (there are no signs of cardiac muscle involvement), manifest by repetitive pre-syncope and syncope episodes.
三分支阻滞，即心室传导系统的三支主束传导受损，可能进展为高度或完全性房室传导阻滞。极少数情况下，同一患者可能同时出现阵发性交替性房室传导阻滞和双侧束支阻滞。这是一位来自流行地区的 60 岁男性患者的心电图，血清学阳性提示恰加斯病，表现为单纯的冲动型（无心肌受累迹象），反复出现前驱晕厥和晕厥发作。
