title: A randomized study of prophylactic catheter ablation in asymptomatic patients with the Wolff-Parkinson-White syndrome.
abstract: BACKGROUND
  Young age and inducibility of atrioventricular reciprocating tachycardia or atrial fibrillation during invasive electrophysiological testing identify asymptomatic patients with a Wolff-Parkinson-White pattern on the electrocardiogram as being at high risk for arrhythmic events. We tested the hypothesis that prophylactic catheter ablation of accessory pathways would provide meaningful and durable benefits as compared with no treatment in such patients.
  
  
  METHODS
  From 1997 to 2002, among 224 eligible asymptomatic patients with the Wolff-Parkinson-White syndrome, patients at high risk for arrhythmias were randomly assigned to radio-frequency catheter ablation of accessory pathways (37 patients) or no treatment (35 patients). The end point was the occurrence of arrhythmic events over a five-year follow-up period.
  
  
  RESULTS
  Patients assigned to ablation had base-line characteristics that were similar to those of the controls. Two patients in the ablation group (5 percent) and 21 in the control group (60 percent) had arrhythmic events. One control patient had ventricular fibrillation as the presenting arrhythmia. The five-year Kaplan-Meier estimates of the incidence of arrhythmic events were 7 percent among patients who underwent ablation and 77 percent among the controls (P<0.001 by the log-rank test); the risk reduction with ablation was 92 percent (relative risk, 0.08; 95 percent confidence interval, 0.02 to 0.33; P<0.001).
  
  
  CONCLUSIONS
  Prophylactic accessory-pathway ablation markedly reduces the frequency of arrhythmic events in asymptomatic patients with the Wolff-Parkinson-White syndrome who are at high risk for such events.
authors: Department of Cardiology, Electrophysiology and Cardiac Pacing Unit, San Raffaele University Hospital, Milan, Italy. carlo.pappone@hsr.it
authors: Carlo
authors: C
authors: Pappone
authors: Vincenzo
authors: V
authors: Santinelli
authors: Francesco
authors: F
authors: Manguso
authors: Giuseppe
authors: G
authors: Augello
authors: Ornella
authors: O
authors: Santinelli
authors: Gabriele
authors: G
authors: Vicedomini
authors: Simone
authors: S
authors: Gulletta
authors: Patrizio
authors: P
authors: Mazzone
authors: Valter
authors: V
authors: Tortoriello
authors: Alessia
authors: A
authors: Pappone
authors: Cosimo
authors: C
authors: Dicandia
authors: Salvatore
authors: S
authors: Rosanio
mesh_terms: D000293:Adolescent; D000328:Adult; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018570:Risk Assessment; D016019:Survival Analysis; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy*