Three years of cardiac resynchronization therapy: could superior benefits be obtained in patients with heart failure and narrow QRS?


AIM OF THE STUDY To examine the long-term effects of cardiac resynchronization therapy (CRT) in patients presenting with heart failure (HF) and QRS </= 120 ms. METHODS This was a prospective, longitudinal study of 376 patients [mean age = 65 years, mean left ventricular (LV) ejection fraction (EF) = 29%, mean QRS duration = 165 ms, mean distance covered… (More)


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