title: Radiofrequency ablation of atrioventricular nodal reentrant tachycardia using a novel magnetic guidance system compared with a conventional approach.
abstract: BACKGROUND
  A novel magnetic guidance system has been developed that allows the operator to remotely navigate an electrophysiology mapping/ablation catheter to precise locations in the heart for treatment of tachyarrhythmias. To date, this new technology has not been directly compared with the conventional approach.
  
  
  OBJECTIVE
  To compare the use of the magnetic guidance system to the conventional approach for ablation of atrioventricular nodal reentry tachycardia.
  
  
  METHODS
  Between November 2002 and October 2004, 28 patients with atrioventricular nodal reentry tachycardia treated with the magnetic guidance system were retrospectively compared with 28 matched control patients.
  
  
  RESULTS
  Patients treated using the magnetic guidance system had similar procedure durations and fluoroscopy times compared with the matched controls. The only statistically significant difference between the groups was a longer time between insertion of the ablation catheter and placement of the first radiofrequency lesion in the magnetic guidance system cohort (23.3 +/- 12.0 vs. 10.5 +/- 13.9, p=0.001), possibly due to the research protocol. However, there was a trend toward a shorter total time that radiofrequency energy was applied in the magnetic guidance system cohort (5.2 +/- 4.5 vs. 8.0 +/- 7.2, p=0.087). There were no major complications or recurrences after at least 3 months of follow-up among the patients treated with the magnetic guidance system.
  
  
  CONCLUSIONS
  The magnetic guidance system appears to have similar, and possibly improved, clinical efficacy compared with conventional catheter navigation for the treatment of atrioventricular nodal reentrant tachycardia.
authors.affiliation: Cardiovascular Division, Department of Medicine, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
authors.forename: Roger
authors.initials: R
authors.lastname: Kerzner
authors.forename: José Mauricio
authors.initials: JM
authors.lastname: Sánchez
authors.forename: Judy L
authors.initials: JL
authors.lastname: Osborn
authors.forename: Jane
authors.initials: J
authors.lastname: Chen
authors.forename: Mitchell N
authors.initials: MN
authors.lastname: Faddis
authors.forename: Marye J
authors.initials: MJ
authors.lastname: Gleva
authors.forename: Bruce D
authors.initials: BD
authors.lastname: Lindsay
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Smith
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D017115:Catheter Ablation / Q000379:methods*; D016009:Chi-Square Distribution; D015331:Cohort Studies; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008280:Magnetics; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D012189:Retrospective Studies; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000601:surgery*; D013997:Time Factors