title: ECG of the month. Bifocals. Bigeminal rhythm.
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: D000368:Aged; D000369:Aged, 80 and over; D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D018879:Ventricular Premature Complexes / Q000175:diagnosis