Abstract
The MADIT-CRT study demonstrated the effectiveness of cardiac resynchronization therapy (CRT) in patients with mild heart failure (HF) symptoms (New York Heart Association class I or II) and sinus rhythm, left ventricular ejection fractions (LVEFs) of ≤30%, and QRS durations of ≥130 milliseconds (JW Cardiol Sep 1 2009). In this substudy, investigators sought to determine …
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