Abstract 1856: Right Ventricular Outflow Tract Pacing is Superior to Right Ventricular Apical Pacing on Cardiac Diastolic Function and Synchronization - A Study with Color Kinesis and Tissue Doppler
Backgrounds: Right ventricular apical (RVA) pacing impairs cardiac function and synchronization. Otherwise, biventricular pacing has been shown to improve to resynchronize contraction and to improve hemodynamics. However, the hemodynamic effect of right ventricular outflow tract (RVOT) pacing is unknown. We hypothesized that RVOT pacing might be more physiological on cardiac function and synchronization than RVA pacing. In this study, we compared cardiac diastolic function and synchronization between RVA and RVOT pacing patients.
Methods: We studied 28 patients with DDD pacemaker, normal left ventricular function, and no structural heart disease, in whom 14 were RVA pacing and 14 were RVOT pacing (12 sick sinus syndromes and 16 complete AV blocks). We compared parameters of cardiac diastolic function (color kinesis diastolic index (CKDI): left ventricular segmental filling fraction calculated during the first 30% of the diastolic filling time) and cardiac synchronization (tissue Doppler-derived intraventricular delay (TDD)) between RVA and RVOT pacing patients.
Results: CKDI and TDD of RVOT pacing patients were significantly superior to those of RVA pacing patients. (table⇓)
Conclusion: Our findings suggested that RVOT pacing was superior to RVA pacing on cardiac diastolic function and synchronization.