title: Direct recording of concealed ventricular extrasystoles producing pacer inhibition.
abstract: We report a case of concealed extrasystoles recorded from a pacing lead. The concealed extrasystoles were observed with right ventricular pacing, biventricular unipolar, and biventricular bipolar pacing. The simultaneous surface EKG did not show manifest ventricular extrasystoles with the concealed intracardiac potentials. This case highlights a cause of oversensing that has been theoretically reported in the literature but never directly observed.
authors.affiliation: University of Michigan Hospital and Health Systems, Ann Arbor, Michigan, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Bowers
authors.forename: Marcie
authors.initials: M
authors.lastname: Berger
mesh_terms: D000200:Action Potentials; D002304:Cardiac Pacing, Artificial; D017147:Defibrillators, Implantable; D020878:Device Removal; D004554:Electric Countershock / Q000295:instrumentation; D004562:Electrocardiography / Q000295:instrumentation; D004867:Equipment Design; D004868:Equipment Failure; D006327:Heart Block / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011237:Predictive Value of Tests; D012815:Signal Processing, Computer-Assisted; D013686:Telemetry / Q000295:instrumentation; D013997:Time Factors; D018879:Ventricular Premature Complexes / Q000175:diagnosis* / Q000503:physiopathology
keywords: PVCs; concealed PVC; concealed conduction; pacemaker