Characteristics of surface electrocardiogram in patients with pacing at different sites of right ventricular outflow tract
HU Jun
JIANG Li-cheng
LI Yang
YU Bo
Abstract：Objective To discuss the relationship between characteristics of surface electrocardiogram (ECG) and pacing at different sites of right ventricular outflow tract (RVOT).Methods The patients undergone pacing of RVOT (n=186) were chosen, and then divided into upper interval group (n=45), lower interval group (n=24), anterior wall group (n=101) and free wall group (n=16). The difference in characteristics of surface ECG was compared among 4 groups under right ventricular pacing condition.Results The difference in general clinical data had no statistical significance among 4 groups (P>0.05). QRS duration was (173±14) ms in free wall group, which was longer than that in other 3 groups (P=0.014). QRS group frontal plane axis was (61±47) ° in upper interval group and (-18±52) ° in lower interval group (P=0.01). The precordial lead transitional zone index (TZI) was the minimum in upper interval group and the maximum in free wall group (P=0.01). The comparison in QRS main wave vector in limb leads among 4 groups showed that the percentage of upward QRS main wave in inferior wall leads (Ⅱ, Ⅲ and aVF) was the maximum in upper interval group.Conclusion The characteristics of surface ECG is conducive to locating the different sites of RVOT pacing, but more studies with larger sample size are needed to confirm the conclusion.
Keywords：Ventricular septalPacingSurface electrocardiogramRight ventricular outflow tractPrecordial lead transitional zone index
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 305-307 )