title: Unusual presentation of DDD pacemaker system malfunction.
abstract: A DDD pacemaker utilizing an atrial J electrode was implanted in a patient whose right atrial appendage had been removed 7 years prior during aortic valve replacement. Alternating QRS morphologies produced by pacemaker stimulus artifacts occurred as a consequence of atrial lead dislodgement. The screw-in atrial electrode has superior stability in patients with right atrial appendage removal; stability of the atrial J electrode cannot be obtained in such cases.
authors.forename: S
authors.initials: S
authors.lastname: Stark
authors.forename: A
authors.initials: A
authors.lastname: Farshidi
authors.forename: W D
authors.initials: WD
authors.lastname: Hager
authors.forename: M C
authors.initials: MC
authors.lastname: Donaldson
mesh_terms: D004562:Electrocardiography; D004868:Equipment Failure; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000503:physiopathology / Q000628:therapy*; D006329:Heart Conduction System / Q000503:physiopathology; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D010138:Pacemaker, Artificial