Left ventricular torsion and untwisting in patients with coronary artery disease by speckle tracking imaging
10.3760/cma.j.issn.1004-4477.2010.05.001
- VernacularTitle:斑点追踪显像技术对冠心病左心室扭转和解旋运动的研究
- Author:
Zhaohuan LI
;
Hong TANG
- Publication Type:Journal Article
- Keywords:
Echocardiography;
Coronary disease;
Torsion ％ Speckle tracking imaging
- From:
Chinese Journal of Ultrasonography
2010;19(5):369-373
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate left ventricular torsion and untwisting in patients with coronary artery disease by speckle tracking imaging. Methods Study population consisted of 48 patients, who were diagnosed coronary artery disease initially and received one of coronary arteriography, coronary artery spiral computerized tomography, radionuclide imaging, interventional therapy and bypass surgery. High frame rate (≥60 frame/s) two-dimensional dynamic images of the left ventricular apical long-axis views and parasternal short-axis views at basal and apical levels were recorded. Rotation was measured in the left ventricular short-axis views using 2D strain software. Left ventricular torsion was defined as relative rotation degree between the apical level and basal level. Patients were divided into three groups according to clinic final diagnosis [myocardial infarction ( MIN) group, n = 19; myocardial ischemia ( MIS) group, n =19; normal coronary artery (Contrast) group, n - 10]. Results In MIS group,peak rotation value and rotation value at aortic valve closure in basal level were smaller than those in apical level. Untwisting rate reduced in MIN group. There was linear correlation between left ventricular peak torsion and end-diastolic diameter. There was aslo linear correlation between left ventricular peak torsion and eject fraction. Left ventricular peak rotation at basal level was correlative to eject fraction. Left ventricular untwisting rate had linear correlation to eject fraction, and also had correlation to peak torsion. Conclusions In patients with myocardial ischemia, left ventricular rotation value at apical level is larger than that at basal level. Left ventricular diastolic function is injured severely in patients with myocardial infarction. Untwisting rate is a quantitative index to evaluate myocardial diastolic function.
