Association of persistent or worsened echocardiographic dyssynchrony with unfavourable clinical outcomes in heart failure patients with narrow QRS width: a subgroup analysis of the EchoCRT trial

摘要

Aims EchoCRTwas a randomized trial of cardiac resynchronization therapy (CRT) in severely symptomatic heart failure (HF) patients with narrow QRS width <130 ms, ejection fraction <= 35%, and echocardiographic dyssynchrony. All received CRT implants which were then randomized to CRT-On or CRT-Off. While the trial showed no benefit of CRT to these patients, the aim of this subgroup analysis was to test the hypothesis that persistent or worsening dyssynchrony is associated with unfavourable clinical outcomes.