title: [Velocity vector imaging for left ventricular diastolic function assessment and the reference values].
abstract: OBJECTIVE
  To study value of velocity vector imaging (VVI) in assessment of normal left ventricular diastolic function and the corresponding reference values.
  
  
  METHODS
  Ninety-seven healthy subjects were selected by combined clinical, ultrasound, and NT-proBNP examinations. Using a Siemens Acuson Sequoia C512 echocardiograph, VVI was adopted to examine the myocardial early diastolic velocity (E) of the septal, lateral, anterior, inferior, anterior septum, and posterior wall of the left ventricle at the level of mitral annulus. The images were analyzed for VVI and the mean diastolic velocity (E(m)) and hence the E/E(m) ratio was calculated based on the offline workstation interface.
  
  
  RESULTS
  The reference range of E/E(m) ratio derived from the data of the 97 healthy subjects was (unilateral boundaries with 95% limit) and (1, 22.935), was (1, 22.300) in male subjects and (1, 24.766) in female subjects. The reference E/E(m) range was (0, 22.413) in male subjects under 50 years of age, (1, 24.766) in female subjects under 50 years, (1, 22.300) in male subjects over 50 years, and (1, 24.766) in female subjects over 50 years.
  
  
  CONCLUSIONS
  VVI is a good method for non-invasive evaluation of the left ventricular diastolic function and provides an accurate and reliable means for clinical assessment of the left ventricular diastolic function.
authors.affiliation: Department of Cardiology, Southern Medical University, Guangzhou, China. lshhappy521@126.com
authors.forename: Sheng-hui
authors.initials: SH
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.forename: Dao-gang
authors.initials: DG
authors.lastname: Zha
authors.forename: Chuan
authors.initials: C
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: Hu
authors.forename: Yi-li
authors.initials: YL
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology; D003971:Diastole / Q000502:physiology*; D004452:Echocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D016277:Ventricular Function, Left / Q000502:physiology*; D055815:Young Adult