Idiopathic ventricular arrhythmias originating from the right coronary sinus: Prevalence, electrocardiographic and electrophysiological characteristics, and catheter ablation

BACKGROUND Ventricular arrhythmias (VAs) of the right coronary cusp (RCC) are not fully characterized.OBJECTIVES To investigate the electrocardiographic and electrophysiological characteristics, mapping and ablation of RCC-VAs.METHODS Among 256 consecutive patients undergoing electrophysiological evaluation and ablation of VAs of ventricular outflow tract origin, data were compared among 27 RCC-VAs, 50 VAs of the septal aspect of right ventricular outflow tract (RVOT), including from pulmonary artery, and 9 VAs of left coronary cusp (LCC).RESULTS The only electrocardiographic characteristic that differentiated VAs originating from the RCC and RVOT was the amplitude of the R wave in lead I. During VAs of the RCC, the earliest activation site (EAS) in the right ventricle was localized in the middle-posterior septal region of the RVOT. The distance between the His bundle and the EAS in the RVOT in the RCC group was shorter than that in the RVOT and LCC group; the distance

背景 右冠状动脉窦（RCC）室性心律失常（VAs）尚未完全明确特征。 目的 研究RCC - VAs的心电图和电生理特征、标测及消融。 方法 在256例连续接受电生理评估及心室流出道起源的VAs消融的患者中，对27例RCC - VAs、50例右心室流出道（RVOT）间隔部位（包括肺动脉）的VAs以及9例左冠状动脉窦（LCC）的VAs的数据进行比较。 结果 区分起源于RCC和RVOT的VAs的唯一心电图特征是I导联R波振幅。在RCC的VAs期间，右心室最早激动部位（EAS）位于RVOT的中后间隔区域。RCC组中希氏束与RVOT内EAS之间的距离比RVOT组和LCC组短；该距离……