title: Some caveats about QRS duration in patients receiving cardiac resynchronization therapy.
authors: John E
authors: JE
authors: Madias
mesh_terms: D058406:Cardiac Resynchronization Therapy / Q000379:methods*; D017147:Defibrillators, Implantable; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors