Study of left ventricular twisting in premature ventricular contraction from right ventricle by velocity vector imaging
- VernacularTitle:速度向量成像对右室起源室性期前收缩左心室收缩期旋转运动的研究
- Author:
Jing YAO
;
Di XU
;
Fengxiang LU
;
Yonghong YONG
;
Ling JI
;
Kejiang CAO
- Publication Type:Journal Article
- Keywords:
Echocardiography;
Ventricular premature complexes;
Ventricular function,left;
Velocity vector imaging
- From:
Chinese Journal of Ultrasonography
2008;17(6):479-483
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess left ventricular(LV)twisting parameters in different layers with velocity vector imaging(VVI)in both healthy subjects and premature ventricular contraction(PVC)bigeminy from right ventricle(RV)patients,and investigate the rules of LV myocardium dynamics in sinus rhythm and PVC from RV.Methods Ten patients with PVC bigeminy from RV and twelve healthy subj ects underwent the examination of two-dimensional ultrasound,in which the standard LV mitral valve(MV)and apical short-axis views were acquired.The twisting angle(TA)and untwisting starting time(UST)were measured.Results In healthy subjects myocardium of LV MV short-axis twisted in clockwise,while the myocardium of LV apical short-axis twisted in counter-clockwise.TA of endocardium was higher than that of epieardium(P＜0.01).In PVC bigeminy from RA patients,their TA during sinus contraction was lower than that of healthy subjects both in MV and apical short axis respectively(P＜0.05),and UST was earlier(P＜0.05).In PVC the TA curve is bidirectional.and in early systolic TA twisted reversely compared with that of healthy subjects and sinus contraction in PVC patients.Conclusions Twisting parameters could be used to assess myocardium dynamics during different ventricular mechanical activation.VVl was a novel tool to analyze myocardium twisting.
