title: Reproducibility of arterial elasticity parameters derived from radial artery diastolic pulse contour analysis: the multi-ethnic study of atherosclerosis.
abstract: OBJECTIVE
  The aim of this report was to describe the reproducibility of arterial elasticity parameters derived from radial artery diastolic pulse contour analysis.
  
  
  METHODS
  Two measurements were taken on the same day by the same technician with the HDI/Pulsewave CR-2000 System on each of a subset of participants selected randomly from the Multi-Ethnic Study of Atherosclerosis. Large and small artery elasticities (C1 and C2), C1 and C2 each multiplied by systemic vascular resistance (C1xR and C2xR, which are functions of the radial artery pulse waveform only), and systolic and diastolic blood pressures (SBP and DBP) were evaluated.
  
  
  RESULTS
  Two measurements were taken of each of the 131 participants. The mean difference±standard deviation of the difference was -0.13±3.5 mmHg ×10 for C1, -0.03±1.5 mmHg ×100 for C2, 0.10±4.6 s ×10 for C1xR, 0.05±1.8 s ×100 for C2xR, 2.8±8.2 mmHg for SBP, and 1.5±5.0 mmHg for DBP. The between-measure correlation was 0.74 for C1, 0.84 for C2, 0.58 for C1xR, 0.74 for C2xR, 0.90 for SBP, and 0.86 for DBP.
  
  
  CONCLUSIONS
  The reproducibility of arterial elasticity measurements is less than that of SBP and DBP . Multiple measurements of arterial elasticity of a participant are recommended.
authors.affiliation: Department of Biostatistics, University of Washington, Seattle, WA 98195, USA. lynb@u.washington.edu
authors.forename: Lyndia C
authors.initials: LC
authors.lastname: Brumback
authors.forename: David R
authors.initials: DR
authors.lastname: Jacobs
authors.forename: Norma
authors.initials: N
authors.lastname: Dermond
authors.forename: Haiying
authors.initials: H
authors.lastname: Chen
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Duprez
mesh_terms: D000368:Aged; D050197:Atherosclerosis / Q000503:physiopathology*; D001794:Blood Pressure / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011674:Pulse; D017534:Radial Artery / Q000502:physiology*; D014655:Vascular Resistance / Q000502:physiology*