• Pacing Clin Electrophysiol · Apr 2012

    Randomized Controlled Trial

    Near elimination of ventricular pacing in SafeR mode compared to DDD modes: a randomized study of 422 patients.

    • Jean-Marc Davy, Ellen Hoffmann, Axel Frey, Kurt Jocham, Stefano Rossi, Jean-Marc Dupuis, Lorenzo Frabetti, Pascale Ducloux, Emmanuel Prades, and Gaël Jauvert.
    • Clinique du Coeur et des Vaisseaux, CHU de Montpellier, Hôpital Arnaud de Villeneuve, Montpellier, France. jm-davy@chu-montpellier.fr
    • Pacing Clin Electrophysiol. 2012 Apr 1;35(4):392-402.

    AimsSafeR performance versus DDD/automatic mode conversion (DDD/AMC) and DDD with a 250-ms atrioventricular (AV) delay (DDD/LD) modes was assessed toward ventricular pacing (Vp) reduction.MethodsAfter a 1-month run-in phase, recipients of dual-chamber pacemakers without persistent AV block and persistent atrial fibrillation (AF) were randomly assigned to SafeR, DDD/AMC, or DDD/LD in a 1:1:1 design. The main endpoint was the percentage of Vp (%Vp) at 2 months and 1 year after randomization, ascertained from device memories. Secondary endpoints include %Vp at 1 year according to pacing indication and 1-year AF incidence based on automatic mode switch device stored episodes.ResultsAmong 422 randomized patients (73.2±10.6 years, 50% men, sinus node dysfunction 47.4%, paroxysmal AV block 30.3%, bradycardia-tachycardia syndrome 21.8%), 141 were assigned to SafeR versus 146 to DDD/AMC and 135 to DDD/LD modes. Mean %Vp at 2 months was 3.4±12.6% in SafeR versus 33.6±34.7% and 14.0±26.0% in DDD/AMC and DDD/LD modes, respectively (P<0.0001 for both). At 1 year, mean %Vp in SafeR was 4.5±15.3% versus 37.9±34.4% and 16.7±28.0% in DDD/AMC and DDD/LD modes, respectively (P<0.0001 for both). The proportion of patients in whom Vp was completely eliminated was significantly higher in SafeR (69%) versus DDD/AMC (15%) and DDD/LD (45%) modes (P<0.0001 for both), regardless of pacing indication. The absolute risk of developing permanent AF or of remaining in AF for >30% of the time was 5.4% lower in SafeR than in the DDD pacing group (ns).ConclusionsIn this selected patient population, SafeR markedly suppressed unnecessary Vp compared with DDD modes.©2012, The Authors. Journal compilation ©2012 Wiley Periodicals, Inc.

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