title: ECG of the month. Twin spikes. Pacemaker rhythm.
authors.affiliation: Dept of Medicine, Texas Tech University Health Sciences Center, El Paso.
authors.forename: J I
authors.initials: JI
authors.lastname: Martinez-Lopez
mesh_terms: D000368:Aged; D001283:Atrioventricular Node / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate; D006801:Humans