title: ECG of the month. Narrow QRS tachycardia with group beating. Atrial flutter with atrioventricular block at 2 levels: 2:1 above and 4:3 type I block (Wenckebach) below (Figure 2), left axis deviation.
authors.affiliation: Department of Medicine, Louisiana State University Health Sciences Center, New Orleans, USA.
authors.forename: D Luke
authors.initials: DL
authors.lastname: Glancy
authors.forename: Brian P
authors.initials: BP
authors.lastname: Jones
mesh_terms: D001282:Atrial Flutter / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D054537:Atrioventricular Block / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D004418:Dyspnea, Paroxysmal / Q000209:etiology*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D013610:Tachycardia / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology