title: VVI pacemaker ventricular undersensing.
authors.forename: C D
authors.initials: CD
authors.lastname: Johnson
mesh_terms: D000368:Aged; D004562:Electrocardiography; D004868:Equipment Failure; D005260:Female; D006327:Heart Block / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D012804:Sick Sinus Syndrome / Q000628:therapy