title: [Two-dimensional ultrasound speckle tracking imaging in detection of myocardial torsion for patients with chronic pulmonary heart disease].
abstract: OBJECTIVE
  To evaluate the application of two-dimensional ultrasound speckle tracking imaging (STI) in assessment of myocardial torsion and left ventricular function for patients with chronic pulmonary heart disease (CPHD).
  
  
  METHODS
  Thirty six patients with CPHD and 38 normal subjects were enrolled in the study,and STI examinations were performed. The left ventricular short-axis views (mitral level,apical level) were observed,the rotation angles of the standardized time point were measured at each short-axis views and the corresponding left ventricular torsion angles were calculated. Simultaneously, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were recorded. The correlations of left ventricular ejection fraction (LVEF) with left ventricular torsion peak, end-systolic left ventricular twist value in patients were analyzed.
  
  
  RESULTS
  Compared to normal controls, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were significantly lower (P<0.01) in CPHD patients. The LVEF was highly correlated with left ventricular twist peak and end-systolic left ventricular twist value in CPHD patients (r=0.967, 0.952,P<0.001).
  
  
  CONCLUSIONS
  STI is sensitive to detect left ventricular myocardial torsion change; left ventricular torsion peak and end-systolic left ventricular twist value can be used to assess the left ventricular function in patients with CPHD.
authors.affiliation: Department of Ultrasonography, Zhejiang Hospital, Hangzhou 310013, China.
authors.forename: Jing-Yuan
authors.initials: JY
authors.lastname: Huang
authors.forename: Zhe-Lan
authors.initials: ZL
authors.lastname: Zheng
authors.forename: Meng
authors.initials: M
authors.lastname: Ye
mesh_terms: D000368:Aged; D004452:Echocardiography; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011660:Pulmonary Heart Disease / Q000000981:diagnostic imaging*; D014102:Torsion Abnormality / Q000000981:diagnostic imaging*