932 Feasibility and accuracy of single-beat three-dimensional tissue synchronization imaging (TSI) in comparison with two-dimensional TSI in heart failure patients

Abstract

Eur J Echocardiography Abstracts Supplement, December 2006 chrony Index (DI), obtained from 3D echo, has been proposed as a global, accurate and useful parameter. We sought to determine the correlation between currently used parameters of LV dyssynchrony with the DI in patients with systolic dysfunction. Methods: 45 consecutive pts with a LV Ejection Fraction 130 msec, a septal-to-lateral delay >60 msec, the presence of Post-systolic contraction >50 msec of the LV ejection time or a intraLV electromechanical delay >40 msec. From the 3D derived time-volumecurves, the DI, defined as the standard deviation of the time for all the LV segments to reach their minimum volumes was obtained. Correlation was assessed between the DI and conventional parameters of dyssynchrony. Results: Mean age was 65±13 years. The presence of LV dyssynchrony was observed in 29, 47, 32, and 82.4% of patients using the SPWMD, the septalto-lateral delay, the presence of p ost-systolic contraction and the intra-LV electromechanical asynchrony respectively. Average DI was 8.5±4%. No correlation was found between parameters of LV dyssynchrony and the DI. Conclusions: The prevalence of LV dyssynchrony is variable depending on the method used. There is no correlation between the parameters of LV dyssynchrony and the DI. This variability should be considered when applying specific echo-Doppler criteria in cardiac resynchronization.