title: Effect of a pacing mode preserving spontaneous AV conduction on ventricular pacing burden and atrial arrhythmias.
abstract: BACKGROUND
  Using dual-chamber pacemakers with new algorithms: Manage Ventricular Pacing (MVP™), minimizes unnecessary ventricular pacing (VP). This function operates in AAI/R mode with backup VP during AV block.
  
  
  OBJECTIVE
  The aim of "Generation MVP" study was to assess the VP burden and atrial arrhythmias (AA) burden according to indication of pacing and MVP™ function programming of AdaptaDR implantable pacemaker (Medtronic Inc., Minneapolis, MN, USA).
  
  
  METHODS
  The multicenter observational "Generation MVP" study included 220 patients aged 75.9 ± 11 years (men = 52%) implanted for sinus node dysfunction (SND; n = 115) or atrio-ventricular block (AVB; n = 105). Programming MVP function has been left to the physician's discretion. Percentage of VP and AA burden (percentage of time spent in AA) stored in memories were assessed at 2 and 10 months.
  
  
  RESULTS
  220 patients were followed at 2 months (174 MVP [On], 46 MVP [off]) and at 10 months (165 MVP [On], 55 MVP [off]). Median percentage of VP is significantly lower when MVP is programmed [On] versus [off] at 2 and 10 months follow-up for SND and AVB indications of pacing (P < 0.001). Finally, programming MVP function is performed at middle term (10 months) for 84% of patients with SND and 65% of patients with AVB: median percentage of VP is as low as 0.6% for patients with SND and 12% for patients with AVB versus 95% for SND and 99% for AVB when MVP function is programmed [off](P < 0.001). Median AA burden was significantly lower when MVP function was programmed [On] versus [off] at 2 months (8.7% vs 28%; P < 0.001) and 10 months (1% vs 22%; P < 0.001).
  
  
  CONCLUSIONS
  In this study programming MVP function decreases percentage of VP at 2 and 10 months for patients paced for SND or AVB. Moreover median AA burden is reduced when MVP function was programmed [On] vs [off] at two follow-ups.
authors.affiliation: Department of cardiology, CHU Hôpital Sud, Amiens, France. rey.jean-luc@chu-amiens.fr
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Rey
authors.forename: Serge
authors.initials: S
authors.lastname: Quenum
authors.forename: Marc
authors.initials: M
authors.lastname: Hero
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000453:epidemiology* / Q000517:prevention & control*; D054537:Atrioventricular Block / Q000453:epidemiology* / Q000517:prevention & control*; D058406:Cardiac Resynchronization Therapy / Q000379:methods* / Q000706:statistics & numerical data*; D015897:Comorbidity; D005260:Female; D005602:France / Q000453:epidemiology; D006801:Humans; D008297:Male; D015995:Prevalence; D018570:Risk Assessment; D012307:Risk Factors; D013813:Therapy, Computer-Assisted / Q000379:methods* / Q000706:statistics & numerical data; D016896:Treatment Outcome