The X-strain technology in evaluating right ventricular systolic function in patients with pulmonary hypertension

HAOCai-fang; ZHENGMin; XINGYu-wei; SUNSu-li; LIShuo; HOULi-fang; WANGLing

Abstract：Objective To investigate the velocity vector imaging (X‐Strain) technique in evaluating right ventricular sys‐tolic function and its clinical significance in patients of different degrees of pulmonary hypertension (PH) .Methods We chose 60 cases of PH patients (sPAP=40 mmHg ,1 mmHg=0 .133 kPa) ,which be divided into mild PH group and se‐vere PH group according to the pulmonary artery systolic pressure (sPAP) severity ,at the same period ,30 control sub‐jects were recruited .We get the right ventricular anterior wall thickness at end diastole (RVAW) ,right ventricular diame‐ter (RVD) ,right atrial diameter (RAD) ,pulmonary artery diameter (MPA) at end systolic ,right ventricular wall seg‐ments of longitudinal peak systolic strain (LS) ,longitudinal peak systolic strain rate (LSR) ,and then ,the parameters be‐tween groups were compared by one‐way analysis of variance (ANOVA) .Results In severe PH group ,RVAW ,RVED , RAD ,MPA were lower than the control group and the mild PH group ( P<0 .05) ,while these parameters were no sta‐tistically significant difference between the mild PH group and the control group ( P >0 .05) .The LS in mild and severe PH group of right ventricular wall segments were less lower than the control group ( P<0 .05) ,in severe PH group ,the LS of right ventricular wall segments decreased than the mild group ( P <0 .05) ,in severe PH group ,right ventricular wall segments of LSR were lower than the control group and the mild PH group ( P<0 .05) ,the LSR of mild PH group only apical septal of right ventricular free wall and ventricular septal lower than the control group ( P <0 .05) ,the mild PH group right ventricular wall in basal ,middle section of LSR than in the control group had no statistical significance ( P>0 .05) .Conclusion X‐Strain technology can quantitatively evaluate regional systolic function of right ventricular ,sensi‐tively reflect the changes of each segment of right ventricular systolic function before a change in the overall right ventricu‐lar function ,which can provide the accurate basis for the clinical treatment of early intervention .