title: Randomized prospective pilot study of long-term dual-site atrial pacing for prevention of atrial fibrillation.
abstract: OBJECTIVE
  To determine whether dual-site atrial pacing is feasible, safe, and effective.
  
  
  METHODS
  We undertook a randomized prospective single-blind crossover study.
  
  
  METHODS
  Nine patients with at least two episodes per month of symptomatic paroxysmal atrial fibrillation participated in a randomized crossover study involving three separate 3-month blocks of single-site atrial pacing, dual-site atrial pacing, and control (support-only) pacing.
  
  
  RESULTS
  Dual-site atrial pacing resulted in shorter P wave duration (81 +/- 14 ms) than did single-site pacing (111 +/- 12 ms) or control sinus rhythm (123 +/- 9 ms) (P<0.0001) and in fewer premature atrial complexes on Holter monitoring (P = 0.06). The arrhythmia-free interval was longer with dual-site pacing (67 +/- 17 days) than with single-site (62 +/- 30 days) or support-only (49 +/- 34 days) pacing (P = 0.10). This pilot study was not statistically powered to detect a difference between pacing modes.
  
  
  CONCLUSIONS
  (1) Dual-site atrial pacing is feasible and safe; (2) it shortens the P wave duration and tends to decrease premature atrial complexes on Holter monitoring; (3) any atrial pacing tends to prolong the arrhythmia-free interval; and (4) this pilot study enrolled too few patients to determine whether a significant difference in pacing modes exists and supports the need for a larger study.
authors.affiliation: Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic Rochester, Minnesota 55905, USA.
authors.forename: P A
authors.initials: PA
authors.lastname: Friedman
authors.forename: M R
authors.initials: MR
authors.lastname: Hill
authors.forename: S C
authors.initials: SC
authors.lastname: Hammill
authors.forename: D L
authors.initials: DL
authors.lastname: Hayes
authors.forename: M S
authors.initials: MS
authors.lastname: Stanton
mesh_terms: D000328:Adult; D000368:Aged; D001281:Atrial Fibrillation / Q000503:physiopathology / Q000517:prevention & control*; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D015986:Confounding Factors, Epidemiologic; D018592:Cross-Over Studies; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011446:Prospective Studies; D016037:Single-Blind Method; D016896:Treatment Outcome