BACKGROUND: QRS fragmentation (fQRS) has been shown to be a marker of scar in patients with left ventricular dysfunction. Whether fQRS is associated with progressive left ventricular remodeling and increased mortality in patients receiving cardiac resynchronization therapy (CRT) is unclear. METHODS: We reviewed the preimplant and follow-up echocardiograms in 233 patients undergoing the new implantation of a CRT device between December 2001 and November 2006. Patients were included if they had a pre-CRT ECG with appropriate filter settings (filter 0.16-100 or 0.16-150 Hz, 25 mm/s, 10 mm/mV), a left ventricular ejection fraction (LVEF)
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机译：背景：QRS碎片（fQRS）已被证明是左心功能不全患者瘢痕的标志。尚不清楚fQRS是否与进行心脏再同步治疗（CRT）的患者进行性左心室重构和死亡率增加相关。方法：我们回顾了2001年12月至2006年11月之间233例接受CRT装置新植入的患者的植入前和随访超声心动图。如果患者的CRT前ECG带有适当的滤镜设置（滤镜0.16-100或0.16-150 Hz，25 mm / s，10 mm / mV），左心室射血分数（LVEF）
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