title: Electrocardiographic recognition of ventricular ectopic beats in lead V1--a preliminary report.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000209:etiology; D002037:Bundle-Branch Block / Q000175:diagnosis; D004562:Electrocardiography; D006801:Humans; D008875:Middle Aged