Contributions of different components of myocardial motion to left ventricular contraction by two‐dimensional speckle tracking echocardiography / 中华超声影像学杂志

ABSTRACT

Objective To decompose left ventricular contractile motions and analyze the corresponding contributions of different components to left ventricular systolic function . Methods Sixty‐nine healthy adults with normal left ventricular eject fraction ( LVEF ) were recruited . T wo‐dimensional speckle tracking echocardiography was performed by GE Vivid E 9 system ,and strain parameters were analyzed by EchoPac software . Correlation and multiple stepwise regression analysis were performed to analyze the contributions of different components of myocardial motion to left ventricular contraction . Results Global longitudinal strain ( GLS) ,global circumferential strain ( GCS ) ,global radial strain ( GRS ) and twist were all significantly correlated with LVEF ( r ＝ －0 .668 , P ＜0 .001 ; r ＝ －0 .552 , P ＜0 .001 ;r ＝0 .335 , P ＝0 .006 ; r ＝0 .428 , P ＜0 .001) . Significant correlations were found between all the strain parameters ,except for GRS and twist . M ultiple stepwise regression adjusted for sex ,and age showed that the uni‐contributions of GLS , GCS , GRS and twist to LVEF were 21 .3% , 13 .0% , 7 .5% , 8 .8% , respectively . However ,with all strain parameters in the general regression model ,only GLS and twist were still significantly related with LVEF ( R2 ＝0 .566 , P ＜0 .001) . Conclusions T he contributions of various components of myocardial motion to left ventricular contraction in healthy adults are different . Although every component is significantly related with LVEF ,the longitudinal and twist motion are most important in the integrated view .