Comparison of Echocardiographic and Electrocardiographic Mapping for Cardiac Resynchronisation Therapy Optimisation

Table 4

Effects of VV intervals on mean ventricular parameters.

	LVOT VTI (cm)	VaT10-90 index (ms)	TVaT (ms)
LV40	14.5 ± 5	65.3 ± 21	141.6 ± 28
LV30	16.1 ± 6	63.1 ± 19	140.3 ± 26
LV20	14.3 ± 5	65.8 ± 21	140.5 ± 29
LV15	16.6 ± 9	63.4 ± 19	132.0 ± 25
SIM	15.0 ± 6	68.1 ± 19	138.1 ± 25
RV20	14.8 ± 6	66.5 ± 17	135.1 ± 26
RV40	14.6 ± 6	67.3 ± 14	136.6 ± 21

LVOT VTI, left ventricular outflow tract velocity time integral; LVx, intraventricular pacing interval with the left ventricle paced first by x milliseconds; RVx, intraventricular pacing interval with the right ventricle paced first by x milliseconds; SIM, intraventricular pacing interval with the right and left ventricles paced simultaneously; TVaT, total ventricular activation time; VaT_10-90, ventricular activation time_10-90. Values were compared by ANOVA and the Kruskal–Wallis test. No between-group comparisons were significant (Tukey’s HSD).