title: Usefulness of aortic strain analysis by velocity vector imaging as a new echocardiographic measure of arterial stiffness.
abstract: BACKGROUND
  The role of velocity vector imaging (VVI) in evaluating arterial stiffness is not well known. We investigated the usefulness of vascular strain analysis by VVI in evaluating arterial stiffness.
  
  
  METHODS
  Heart-femoral and brachial-ankle pulse wave velocities (PWVs) were measured as standard parameters of arterial stiffness. Intima-media thickness (IMT), fractional shortening (FS), fractional area change (FAC) by two-dimensional (2D) and VVI methods, and peak circumferential strain (PS) of the descending thoracic aorta were measured as echocardiographic parameters of arterial stiffness and compared with PWV in 137 patients (53.8 +/- 13.4 years, 71 male).
  
  
  RESULTS
  Heart-femoral PWV was 9.0 +/- 2.4 m/s, and brachial-ankle PWV was 14.1 +/- 3.0 m/s. Aortic IMT was 0.97 +/- 0.23 mm, and FS was 10.0% +/- 4.0%. FAC was 10.9% +/- 5.2% by 2D tracing and 10.3% +/- 5.1% by the VVI method. PS was 5.4% +/- 3.0%. PS showed significant negative correlation with aortic IMT (r = -0.49, P < .01) and PWV (heart-femoral: r = -0.67, brachial-ankle: r = -0.75, P < .01). PS showed significant positive correlation with FS (r = 0.80, P < .01) and FAC (2D tracing: r = 0.86, VVI: r = 0.88, P < .01). Aortic IMT showed significant positive correlation with PWV (heart-femoral: r = 0.44, brachial-ankle: r = 0.60, P < .01) and negative correlation with FS (r = -0.61, P < .01) and FAC (2D tracing: r = -0.51, VVI: r = - 0.51, P < .01). FS showed significant negative correlation with PWV (heart-femoral: r = -0.54, brachial-ankle: r = -0.72, P < .01). FAC showed significant negative correlation with heart-femoral (2D method: r = -0.61, VVI: r = -0.62, P < .01) and brachial-ankle (2D tracing: r = -0.71, VVI: r = -0.73, P < .01) PWV.
  
  
  CONCLUSIONS
  PS and FAC measured by VVI were significantly associated with parameters of arterial stiffness and thus can be used as new echocardiographic parameters of arterial stiffness.
authors: The Heart Center of Chonnam National University Hospital, Chonnam National University Research Institute of Medical Sciences, Gwangju, Korea.
authors: Kye Hun
authors: KH
authors: Kim
authors: Jong Chun
authors: JC
authors: Park
authors: Hyun Ju
authors: HJ
authors: Yoon
authors: Nam Sik
authors: NS
authors: Yoon
authors: Young Joon
authors: YJ
authors: Hong
authors: Hyung Wook
authors: HW
authors: Park
authors: Ju Han
authors: JH
authors: Kim
authors: Youngkeun
authors: Y
authors: Ahn
authors: Myung Ho
authors: MH
authors: Jeong
authors: Jeong Gwan
authors: JG
authors: Cho
authors: Jung Chaee
authors: JC
authors: Kang
mesh_terms: D001011:Aorta / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D004452:Echocardiography / Q000379:methods*; D055119:Elastic Modulus; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity