title: Four levels of block.
authors.affiliation: Medical Service, St Vincent Hospital, Worcester, MA 01608, USA.
authors.forename: David H S
authors.initials: DH
authors.lastname: Podick
mesh_terms: D000369:Aged, 80 and over; D001919:Bradycardia / Q000209:etiology*; D002303:Cardiac Output, Low / Q000150:complications; D003327:Coronary Disease / Q000150:complications; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications*; D006801:Humans