title: Long-term outcomes of remote magnetic navigation for ablation of supraventricular tachycardias.
abstract: BACKGROUND
  Little is known about the long-term outcomes of catheter ablation of supraventricular tachycardia (SVT) using remote magnetic navigation system (RMN).
  
  
  METHODS
  One hundred twenty patients underwent catheter ablation of SVTs with RMN (Niobe, Stereotaxis, USA): atrioventricular nodal re-entrant tachycardia (AVNRT; n = 59), atrioventricular re-entrant tachycardia (AVRT; n = 45), and focal atrial tachycardia (AT, n = 16). The outcome of AVRT with right free wall accessory pathway was compared with those of a group of 26 consecutive patients undergoing manual ablation.
  
  
  RESULTS
  Mean follow-up period was 2.2 ± 1.4 years. Overall arrhythmia-free survival was 86%; AVRT (77%), AVNRT (96%), and focal AT (71%). After the learning period (initial 50 cases), procedural outcomes had improved for AVRT and AVNRT (91% in overall group, 90% in AVRT group, 100% in AVNRT group, and 68% in focal AT group). The recurrence-free rate was higher for the free wall accessory pathways than those of the other sites (92 vs. 73%, log-rank P = 0.06). Furthermore, when it is confined for the right free wall accessory pathway, RMN showed excellent long-term outcome (7/7, 100 %) compared to the results of manual approach (18/26, 69.2%, log-rank P = 0.07).
  
  
  CONCLUSIONS
  RMN showed favorable long-term outcomes for the ablation of SVT. In our experience, RMN-guided ablation may be associated with a higher success rate as compared to manual ablation when treating right-sided free wall pathways.
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-gu, Seoul, 137-701, South Korea.
authors.forename: Sung-Hwan
authors.initials: SH
authors.lastname: Kim
authors.forename: Yong-Seog
authors.initials: YS
authors.lastname: Oh
authors.forename: Dong-Hwi
authors.initials: DH
authors.lastname: Kim
authors.forename: Ik Jun
authors.initials: IJ
authors.lastname: Choi
authors.forename: Tae-Seok
authors.initials: TS
authors.lastname: Kim
authors.forename: Woo-Seung
authors.initials: WS
authors.lastname: Shin
authors.forename: Ji-Hoon
authors.initials: JH
authors.lastname: Kim
authors.forename: Sung-Won
authors.initials: SW
authors.lastname: Jang
authors.forename: Man Young
authors.initials: MY
authors.lastname: Lee
authors.forename: Tai-Ho
authors.initials: TH
authors.lastname: Rho
mesh_terms: D000328:Adult; D017115:Catheter Ablation / Q000295:instrumentation / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008280:Magnetics / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D013238:Stereotaxic Techniques / Q000295:instrumentation*; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000601:surgery*; D013617:Tachycardia, Supraventricular / Q000601:surgery*; D016896:Treatment Outcome