title: The effects of percutaneous catheter ablation on preexisting permanent pacemakers.
abstract: OBJECTIVE
  Determine the effect of percutaneous catheter ablation (CA) on permanent pacemakers.
  
  
  RESULTS
  Twenty-three patients who underwent CA at The Cleveland Clinic Foundation from September 1983 to January 1990, and had a previously implanted pacemaker were studied. Electrocardiographic data during the CA procedure and clinic data including pacemaker evaluations were analyzed. Fifty-two percent (12/23) of the pacemakers malfunctioned: five developed transient ventricular loss of capture; two undersensing; one oversensing; three could not be interrogated or programmed, and one did not respond to the magnet test. Four patients developed syncopal episodes and two severe dizziness after the procedure. All had their pacemakers replaced. In total, seven were explanted. Destructive analysis by the individual manufacturer identified pacemaker circuitry failure in five. Unipolar pacemakers and anodal ablation procedures had more frequent and severe malfunctions, but the difference was not statistically significant.
  
  
  CONCLUSIONS
  Pacemaker malfunction is frequent during CA. It may be prevented by programming the pacemaker, when possible, to the nonfunctioning mode (000 mode). Temporarily disconnecting the pacemaker during ablation requires further evaluation as an alternative approach. Close follow-up can detect pacemaker malfunction and prevent complications.
authors.affiliation: Department of Cardiology, Cleveland Clinic Foundation, Ohio 44195.
authors.forename: G
authors.initials: G
authors.lastname: Vanerio
authors.forename: J
authors.initials: J
authors.lastname: Maloney
authors.forename: R
authors.initials: R
authors.lastname: Rashidi
authors.forename: R
authors.initials: R
authors.lastname: McCowan
authors.forename: L
authors.initials: L
authors.lastname: Castle
authors.forename: V
authors.initials: V
authors.lastname: Morant
authors.forename: B
authors.initials: B
authors.lastname: Wilkoff
authors.forename: T
authors.initials: T
authors.lastname: Simmons
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000601:surgery / Q000628:therapy; D001283:Atrioventricular Node / Q000601:surgery*; D004562:Electrocardiography; D004564:Electrocoagulation / Q000009:adverse effects*; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial