• Heart Rhythm · May 2013

    Acute hemodynamic benefits of biventricular and single-site systemic ventricular pacing in patients with a systemic right ventricle.

    • Irene E van Geldorp, Pierre Bordachar, Joost Lumens, Maxime de Guillebon, Zachary I Whinnett, Frits W Prinzen, Michel Haïssaguerre, Tammo Delhaas, and Jean-Benoît Thambo.
    • Hôpital Cardiologique du Haut-Lévêque, Bordeaux University Hospital, Bordeaux, France. i.vangeldorp@maastrichtuniversity.nl
    • Heart Rhythm. 2013 May 1; 10 (5): 676-82.

    BackgroundPatients treated by atrial redirection surgery (Senning or Mustard procedure) for transposition of the great arteries (TGA) have an important risk for heart failure caused by dysfunction of the systemic right ventricle. Conventional nonsystemic ventricular pacing (non-systVP) may even further increase this risk.ObjectiveWe investigated the effects of endocardial non-systVP, biventricular pacing (BiVP), and single-site systemic ventricular pacing (systVP) on systolic cardiac pump function in patients with TGA and status post atrial redirection surgery (SenningMustardTGA).MethodsDuring clinically indicated catheterization in 9 patients with SenningMustardTGA, endocardial ventricular stimulation (overdrive DDD mode; 80-90 beats/min) was applied with temporary pacing leads at the nonsystemic and the systemic ventricle. Acute changes in the maximal rate of pressure rise (dP/dtmax) and systolic pressure of the systemic ventricle, as induced by non-systVP, systVP, and BiVP compared to reference, were assessed with a pressure wire within the systemic ventricle. Reference was AAI pacing with a similar heart rate (n = 7) or non-systVP at a lower heart rate than that during stimulation at experimental sites (85 beats/min vs 90 beats/min; n = 2).ResultsSystemic dP/dtmax and systolic ventricular pressure were significantly higher during systVP (+15.6% and +5.1%, respectively) and BiVP (+14.3% and +4.9%, respectively, compared with non-systVP). In 6 of 7 patients, systemic dP/dtmax was higher during BiVP and systVP than during AAI pacing.ConclusionsIn a population of patients with SenningMustardTGA, acute hemodynamic effects of endocardial systVP and BiVP were significantly and equally better than those of non-systVP. In some patients, systVP and BiVP might even be better than ventricular activation by the intrinsic conduction system.Copyright © 2013 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.

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