Comparison of the acute hemodynamic effect of right ventricular apex, outflow tract, and dual-site right ventricular pacing.
BACKGROUND
We studied the acute effect of pacing at the right ventricular outflow tract (RVOT), right ventricular apex (RVA) and simultaneous RVA and RVOT-dual-site right ventricular pacing (DuRV) in random order on systolic function using impedance cardiography.


METHODS
Seventy-three patients (46 males), aged 52-89 years (mean 71.4 years) subjected to routine dual chamber pacemaker implantation with symptomatic chronic II or atrioventricular block, were included to the study.


RESULTS
DuRV pacing resulted in significantly higher cardiac index (CI) in comparison to RVOT and RVA and CI at RVOT was higher than at RVA pacing (2.46 vs 2.35 vs 2.28; P < 0.001). In patients with ejection fraction >50% significantly higher CI was observed during DuRV pacing when compared to RVOT and RVA pacing and there was no difference of CI between RVOT and RVA pacing (2.53 vs 2.41 vs 2.37; P < 0.001). In patients with ejection fraction <50%, DuRV and RVOT pacing resulted in significantly higher CI in comparison to RVA pacing while no difference in CI was observed between RVOT and DuRV pacing (2.28 vs 2.21 vs 2.09; P < 0.001).


CONCLUSIONS
Dual-site right ventricular pacing in comparison to RVA pacing improved cardiac systolic function. RVOT appeared to be more advantageous than RVA pacing in patients with impaired, but not in those with preserved left ventricular function. No clear hemodynamic benefit of DuRV in comparison to RVOT pacing in patients with impaired systolic function was observed.
Department of Cardiology, Medical University of Lublin, Poland..
Andrzej
A
Rubaj
Piotr
P
Rucinski
Tomasz
T
Sodolski
Andrzej
A
Bilan
Marcin
M
Gulaj
Alicja
A
Dabrowska-Kugacka
Andrzej
A
Kutarski
D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D054537:Atrioventricular Block / Q000628:therapy*; D001794:Blood Pressure; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D058409:Cardiac Resynchronization Therapy Devices; D002307:Cardiography, Impedance / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D018487:Ventricular Dysfunction, Left; D016278:Ventricular Function, Right