title: [Evaluation of left ventricular diastolic function in canine acute myocardial ischemia using velocity vector imaging and quantitative tissue velocity imaging].
abstract: OBJECTIVE
  To assess the value of velocity vector imaging (VVI) and quantitative tissue velocity imaging (QTVI) in assessing left ventricular diastolic function of the dogs with acute myocardial ischemia.
  
  
  METHODS
  Six healthy mongrel dogs were subjected to ligation of the left circumflex artery or left anterior descending artery to induce coronary artery stenosis of varying degrees. The mean peak diastolic velocity (Em) of the ventricular walls around the mitral annulus was recorded with VVI or QTVI in the coronary blood flow. The left ventricular end diastolic pressure (LVEDP) was measured with pigtail catheter in the left ventricle.
  
  
  RESULTS
  As the coronary blood flow decreased, LVEDP was gradually increased, and Em measured by VVI or QTVI were also gradually decreased. A good linear correlation was shown between Em measured by VVI or QTVI and LVEDP (r=-0.834, P<0.001, and r=-0.68, P<0.001, respectively). A significant difference was observed in the correlation coefficient between VVI and QTVI (Z=2.625, P=0.0087).
  
  
  CONCLUSIONS
  VVI and QTVI both provide good noninvasive means for measuring left ventricular diastolic function. VVI, a new echocardiographic modality without angular dependence, is better than QTVI in evaluating left ventricular diastolic function.
authors.affiliation: Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. zhanglang19991999@yahoo.com.cn
authors.forename: Chuan
authors.initials: C
authors.lastname: Zhang
authors.forename: Dao-Gang
authors.initials: DG
authors.lastname: Zha
authors.forename: Rong-Sheng
authors.initials: RS
authors.lastname: DU
authors.forename: Feng
authors.initials: F
authors.lastname: Hu
authors.forename: Sheng-Hui
authors.initials: SH
authors.lastname: Li
authors.forename: Xiao-Yuan
authors.initials: XY
authors.lastname: Wu
authors.forename: Yi-Li
authors.initials: YL
authors.lastname: Liu
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004285:Dogs; D004452:Echocardiography / Q000379:methods*; D008297:Male; D017202:Myocardial Ischemia / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D016277:Ventricular Function, Left