Initial exploration of evaluation of left ventricular twist and radial displacement in patients with hypertrophic cardiomyopathy by speckle-tracking imaging
- VernacularTitle:超声二维斑点追踪显像评价肥厚型心肌病左心室扭转和径向位移的初步研究
- Author:
Li ZHANG
;
Mingxing XIE
;
Xinfang WANG
;
Qing LU
;
Wei HAN
;
Jing ZHANG
;
Yingying LIU
;
Ming CHEN
;
Lei WANG
- Publication Type:Journal Article
- Keywords:
Echocardiography;
Cardiomyopathy,hypertrophic;
Ventricular function,left;
Torsion;
Speckle tracking imaging
- From:Chinese Journal of Ultrasonography
2008;17(8):645-648
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the left ventricular twist and radial displacement in patients with hypertrophic cardiomyopathy(HCM)by 2-dimensional(2D)ultrasound speckle-tracking imaging(STI).Methods 2D images of left ventricle at basal and apical short-axis views were acquired in 35 patients with HCM and 35 healthy subjects,and then were analysed off line to assess left ventricular(LV)rotation and radial displacement.Peak rotation(Prot)and the time to peak rotation in basal and apical short axis views were measured separately.Peak twist(Ptw),twist at aortic valve closure(AVCtw),twist at mitral valve opening(MVOtw),untwisting rate(Untw R),half time of untwisting(HTU),radial displacement were also calculated and compared and compared between HCM group and the control group.Based on the value of radial displacement,the LV twist-displacement loop was established and the features of the loop were analyzed.Results ①Compared with the control group,the value of Prot-MV,Prot-AP,Ptw,AVCtw,MVOtw and HTU increased significantly(all P＜0.05)and the Untw R decreased(P＜0.05)in the HCM group.②In HCM group,time to Prot in apical view was higher than that in basal.③ Twist-displacement loops could be constructed noninvasively.The liner slope changed significantly in HCM group compared with that of the control group.Conclusions The characteristics of LV rotation in patients with HCM were significantly different from the normals,and the STI measurement could be used noninvasively to evaluate the characteristics of LV twist and radial displacement.
