title: ECG of the month. A matter of degrees. Second-degree AV block.
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; D002036:Bundle of His / Q000503:physiopathology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000145:classification / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans