Atrial tachycardias originated at the left atrial appendage (LAA) are uncommon; often they are incessant and might induce tachycardiomyopathy, as discussed by Hillock et al. (Heart Rhythm;3(4):467–469, 2006). A case of a 21-year-old woman with incessant atrial tachycardia is presented, refractory to medical therapy, echocardiography showed global dilation with LV ejection fraction of 20%. After two failed endocardial ablations, an epicardial access was attempted. The earliest activation site was located at the tip of the epicardial aspect of the LAA. RFCA was successful at this site. The patient remains asymptomatic during a follow-up of 10 months; the ventricular function was completely recovered after 6 months (LVEF of 50%).

起源于左心耳 (LAA) 的房性心动过速并不常见；正如 Hillock 等人所讨论的那样，它们通常是不间断的，并可能诱发心动过速症。（心律；3(4):467–469, 2006）。一例 21 岁女性患者出现持续性房性心动过速，药物治疗无效，超声心动图显示整体扩张，左室射血分数为 20%。在两次心内膜消融失败后，尝试进行心外膜通路。最早的激活位点位于左心耳心外膜的尖端。RFCA 在此站点上取得了成功。患者在 10 个月的随访期间保持无症状；6个月后心室功能完全恢复（LVEF为50%）。