房颤(atrial fibrillation,AF)是心脏疾病中最常见的心律失常,其发病机制尚不明确,多发子波折返学说被临床及实验研究所证实,被大家公认[1,2]。但近年来,房颤的局灶触发机制越来越被电生理界所重视,对一些有选择的患者进行局灶消融能终止房颤。而这些局灶触发灶可以在Marshall Atrial fibrillation (AF) is the most common cardiac arrhythmia in heart disease. The pathogenesis of atrial fibrillation (AF) is not clear yet. The theory of multiple reentry is confirmed by clinical and experimental studies and has been widely acknowledged [1,2]. However, in recent years, focal trigger mechanism of atrial fibrillation more and more attention by the electrophysiological community, for some selective patients with focal ablation can terminate atrial fibrillation. These focal triggering stoves can be at Marshall