title: ECG of the month. Intermittently wide QRS complexes. Sinus rhythm with Wolff-Parkinson-White type pre-excitation and spontaneous intermittent block in the accessory pathway.
authors.forename: Viviana C
authors.initials: VC
authors.lastname: Falco
authors.forename: Darrin M
authors.initials: DM
authors.lastname: Breaux
authors.forename: D Luke
authors.initials: DL
authors.lastname: Glancy
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000150:complications* / Q000175:diagnosis*; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000473:pathology; D006801:Humans; D014927:Wolff-Parkinson-White Syndrome / Q000150:complications* / Q000175:diagnosis*