title: QRS duration: problems in its implementation in patients with heart failure.
authors: Division of Cardiology, Elmhurst Hospital Center, 79-01 Broadway, Elmhurst, NY 11373, USA. madiasj@nychhc.org
authors: John E
authors: JE
authors: Madias
mesh_terms: D004562:Electrocardiography / Q000379:methods*; D006333:Heart Failure / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016896:Treatment Outcome