Common atrium (CA), also called three-chambered heart, is one of the rare congenital anomalies, defined by a complete absence of the atrial septum, eventually associated with malformation of the atrioventricular (AV) valves. We report the case of a 57-year-old woman with CA complicated with Eisenmenger syndrome and inferior vena cava interruption, who suffered from symptomatic persistent atrial fibrillation (AF). She underwent an initial successful pulmonary vein isolation procedure. A repeat procedure for perivalvular atrial flutter was complicated with inadvertent complete AV block, due to unusual AV node location in this challenging anatomy.

中文翻译：

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下腔静脉中断的单心房房颤消融

共同心房 (CA)，也称为三腔心脏，是一种罕见的先天性异常，其定义是房间隔完全缺失，最终与房室 (AV) 瓣膜畸形相关。我们报告一例患有CA并发艾森门格综合征和下腔静脉中断的57岁女性病例，她患有有症状的持续性心房颤动（AF）。她接受了初步成功的肺静脉隔离手术。由于房室结在这一具有挑战性的解剖结构中的位置不寻常，瓣周心房扑动的重复手术会因无意中完全房室传导阻滞而变得复杂。