To the Editor: In their study of hospitalization for heart failure with reduced left ventricular ejection fraction, Dr Wang and colleagues1 found that a prolonged baseline QRS duration was an independent predictor of high postdischarge morbidity and mortality. They also observed that patients who experienced a change in QRS duration during hospitalization had an increased rate of end points.
QRS Duration in Patients Hospitalized for Worsening Heart Failure. JAMA. 2008;300(16):1879-1881. doi:10.1001/jama.2008.502