Right ventricular pacing impairs endothelial function in man

Anna Maria Choy, Henry H. M. Su, Douglas H. J. Elder, Awsan Noman, Maheshwar Pauriah, Allan D. Struthers, Chim C. Lang

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Aims Clinical trial data show that right ventricular pacing worsens cardiovascular outcomes. The underlying pathophysiology of this is undetermined. We studied the effects of right ventricular pacing on cardiac measures of vascular health (endothelial function), ventricular wall stress (B-type natriuretic peptide), and cardiac reserve (cardiac output response to exercise) in subjects with pacemakers.

    Methods and results Twenty-two subjects [mean age 68.4 +/- 8.8 (SD) years] with dual-chamber pacemakers implanted for sino-atrial disease were studied in a randomized crossover study comparing minimal right ventricular pacing [RVP-min; pacing with long atrioventricular delay (AVD)] to maximal right ventricular pacing (RVP-max; pacing with short AVD). Endothelial function was measured with reactive hyperaemia peripheral arterial tonometry. Cardiac output at rest and during exercise was determined using an inert gas rebreathing method. Right ventricular pacing was significantly higher in RVP-max when compared with RVP-min (90 +/- 16 vs. 15 +/- 20%, P < 0.001). Reactive hyperaemia peripheral arterial tonometry index was significantly lower after RVP-max vs. RVP-min (1.73 +/- 0.33 vs. 1.96 +/- 0.37, P < 0.05). B-type natriuretic peptide was not significantly different between pacing modes (113 +/- 80 vs. 104 +/- 108 pg/mL, P = NS). Cardiac output at peak exercise was significantly lower during RVP-max (7.65 +/- 3.15 vs. 7.05 +/- 2.61 L/min, P < 0.05).

    Conclusion Right ventricular pacing is associated with worsened endothelial function and cardiac reserve.

    Original languageEnglish
    Pages (from-to)853-858
    Number of pages6
    JournalEP-Europace
    Volume13
    Issue number6
    DOIs
    Publication statusPublished - Jun 2011

    Keywords

    • Right ventricular pacing
    • Endothelial function
    • BNP
    • Ventricular dyssynchrony
    • CARDIAC-RESYNCHRONIZATION THERAPY
    • CHRONIC HEART-FAILURE
    • SINUS NODE DYSFUNCTION
    • CORONARY ATHEROSCLEROSIS
    • CARDIOVASCULAR EVENTS
    • PACEMAKER PATIENTS
    • EJECTION FRACTION
    • QRS DURATION
    • SHEAR-STRESS
    • AV-BLOCK

    Cite this