title: Radiofrequency catheter ablation of atrial tachycardia under navigation using the EnSite array.
abstract: BACKGROUND
  Atrial tachycardia (AT) is sometimes difficult to eliminate by radiofrequency ablation (RFA), but the EnSite array (EA) visualizes the beat-to-beat virtual activation of any tachycardia.
  
  
  RESULTS
  The 51 patients with 74 ATs (mean age 57+/-18 years, 28 males) undergoing EA-guided RFA were included; 14 patients had had previous open heart surgery and 5 had organic heart disease. RFA was performed at the AT focus for focal AT (n=48) with an endpoint of AT termination and subsequent non-inducibility. RFA was performed at a critical conducting pathway for reentrant AT (n=26) with creation of a block line in the critical reentry circuit. EA revealed that 57 ATs originated in the right atrium (77%) and 17 originated in the left atrium (23%); all but 1 were successfully eliminated. Fluoroscopic time was 19+/-11 min, the number of RFA applications was 8+/-7, and the radiofrequency energy was 10,711+/-12,655 J. No complications were noted. All but 2 patients were free of any symptoms during a follow-up of 16+/-9 months.
  
  
  CONCLUSIONS
  EA-guided RFA is safe and effective for AT, irrespective of its mechanism, sustainability or origin, and regardless of underlying heart disease. (Circ J 2010; 74: 59 - 65).
authors.affiliation: EP Expert Doctors-Team Tsuchiya, Japan.
authors.forename: Sumito
authors.initials: S
authors.lastname: Narita
authors.forename: Koji
authors.initials: K
authors.lastname: Miyamoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Yasutsugu
authors.initials: Y
authors.lastname: Nagamoto
authors.forename: Takanori
authors.initials: T
authors.lastname: Yamaguchi
mesh_terms: D000328:Adult; D000368:Aged; D017115:Catheter Ablation; D004562:Electrocardiography; D004566:Electrodes; D022062:Electrophysiologic Techniques, Cardiac / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013612:Tachycardia, Ectopic Atrial / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome