Assessment of cardiac twist in hypertrophic cardiomyopathy using velocity vector imaging
10.3760/cma,j.issn.1004-4477.2009.11.003
- VernacularTitle:速度向量成像技术评价肥厚型心肌病心脏扭转运动
- Author:
Xiaowei LIU
;
Zhian LI
;
Ya YANG
- Publication Type:Journal Article
- Keywords:
Echocardiography;
Cardiomyopathy;
hypertrophic;
Torsion;
Ventricular function;
left;
Velocity vector imaging
- From:
Chinese Journal of Ultrasonography
2009;18(11):929-933
- CountryChina
- Language:Chinese
-
Abstract:
Objective To assess global and regional cardiac twist function in hypertrophic cardiomyopathy(HCM) patients by velocity vector imaging(VVl).Methods Thirty HCM patients and 33 normal subjects were enrolled into this study.Two dimensional echocardiographic images of parasternal left ventricular basal level,middle and apical level short axis plane,apical four-and two-chamber plane were obtained.Maximal rotation degree,peak rotation rate,circumferential strain (CS) and strain rate (CSR),radial strain(RS) and strain rate(RSR) in systole were measured using VVI offline software.In addition,diastolic peak un-rotation rate,untwisting rate(unTwR) were measured.Each parameters was analyzed both in subendocardial and subepicardial layer.Results There was no significant difference in left ventricular ejection fraction between two groups.EDV,ESV,SV were significantly decreased (P＜0.01) in HCM group.Left ventricular twist(LVtw),CS of subendocardial layer were higher in HCM group than control group(P＜0.05),while the peak rotation rate,un-rotation rate,CS,CSR were lower of subepicardial layer (P＜0.05).The RSR of each short axis level were significantly decreased in HCM group (P＜0.01).The diastolic unTwR was decreased in HCM group (P＜0.05).For further analysis of the two subgroups in HCM,more regional torsion deterioration occurred in patients with left ventricular outflow tract obstruction than those without obstruction.Conclusions The global cardiac twist angle of HCM was higher than normal person,but the circumferential deformation ability of regional myocardium was impaired,left ventricular outflow tract obstruction may aggravate the regional myocardial dysfunction.
