title: ECG of the month. On the fast or slow lane? Narrow-QRS tachycardia.
abstract: The continuous rhythm strip shown below, limb lead II, belongs to a 37-year-old woman. She has a long-standing history of palpitations, for which she has been hospitalized many times. She is not compliant with treatment.
authors.affiliation: Department of Medicine, Texas Tech University Health Sciences Center, El Paso, USA.
authors.forename: J I
authors.initials: JI
authors.lastname: Martinez-Lopez
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006801:Humans; D013617:Tachycardia, Supraventricular / Q000175:diagnosis* / Q000503:physiopathology