title: Atrial fibrillation and quality of life after pacemaker implantation for sick sinus syndrome: data from the Mode Selection Trial (MOST).
abstract: BACKGROUND
  In the Mode Selection Trial (MOST) of 2,010 patients with sinus node dysfunction, dual-chamber-paced patients had less atrial fibrillation (AF) and heart failure and had slightly improved health-related quality of life (QOL) compared with rate modulated right ventricular-paced patients. Our objective was to assess the impact of AF on QOL within MOST.
  
  
  METHODS
  We analyzed serial QOL measures (Short Form-36, Specific Activity Scale, time trade-off) in 3 groups: (1) those without AF; (2) those with paroxysmal AF (PAF), but not chronic AF (CAF); and (3) those with CAF. We carried forward the last known QOL before crossover for all subsequent time points in patients randomized to rate modulated right ventricular pacing who crossed over to dual-chamber pacing for severe pacemaker syndrome.
  
  
  RESULTS
  Three hundred seventeen patients (15.8%) had AF in the year after implantation, 206 patients within 3 months (191 PAF, 15 CAF), and another 159 (124 PAF, 35 CAF) between 3 and 12 months. There were no significant differences among groups in individual Short Form-36 subscales or time trade-off scores at 12 months as compared with baseline or 3 months. Cardiovascular health status was better at 12 months as compared with baseline or 3 months in those without AF.
  
  
  CONCLUSIONS
  Atrial fibrillation after pacemaker implantation in elderly patients with sick sinus syndrome was not a major determinant of QOL. However, there was a trend toward better cardiovascular functional status in patients without AF.
authors.affiliation: Department of Medicine, The University of California-San Francisco, 505 Parnassus Ave., San Francisco, CA 94143, USA. fleischm@medicine.ucsf.edu
authors.forename: Kirsten E
authors.initials: KE
authors.lastname: Fleischmann
authors.forename: E John
authors.initials: EJ
authors.lastname: Orav
authors.forename: Gervasio A
authors.initials: GA
authors.lastname: Lamas
authors.forename: Carol M
authors.initials: CM
authors.lastname: Mangione
authors.forename: Eleanor B
authors.initials: EB
authors.lastname: Schron
authors.forename: Kerry L
authors.initials: KL
authors.lastname: Lee
authors.forename: Lee
authors.initials: L
authors.lastname: Goldman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000523:psychology / Q000628:therapy*; D015331:Cohort Studies; D018592:Cross-Over Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D017063:Outcome Assessment, Health Care / Q000706:statistics & numerical data; D010138:Pacemaker, Artificial / Q000523:psychology*; D011474:Prosthesis Design; D011788:Quality of Life / Q000523:psychology*; D016032:Randomized Controlled Trials as Topic / Q000706:statistics & numerical data*; D012804:Sick Sinus Syndrome / Q000523:psychology / Q000628:therapy*