title: Microdislodgment of ventricular pacing lead undetectable during rapid pacing one year after implantation.
abstract: A 71-year-old woman had undergone valvular heart surgery in 1981, and implantation of a permanent ventricular pacemaker for ventricular pauses during atrial fibrillation in 2001. One year after pacemaker implantation, she complained of faintness. When pacing at 100 beats/min the pacemaker functioned properly. However, pacing and sensing failure was detected at a pacing rate of 60 beats/min. At rapid pacing rates, the lead tip was in closer contact with the endocardium, and its microdislodgment was undetectable. The symptoms have resolved since the lead was repositioned.
authors.affiliation: First Department of Internal Medicine, Niigata University School of Medicine, 2-746 Asahimachi, Niigata 951-8518, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Chinushi
authors.forename: Masaomi
authors.initials: M
authors.lastname: Chinushi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Furushima
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Tanabe
authors.forename: Takashi
authors.initials: T
authors.lastname: Washizuka
authors.forename: Yoshifusa
authors.initials: Y
authors.lastname: Aizawa
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000628:therapy; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004567:Electrodes, Implanted; D004868:Equipment Failure; D005260:Female; D006339:Heart Rate; D006801:Humans; D010138:Pacemaker, Artificial; D013997:Time Factors