title: A reproducibility study of a TDI-based method to calculate indices of arterial stiffness.
abstract: The aim of the study was to investigate the reproducibility of estimation of Young's modulus E and pressure strain elastic modulus Ep, derived from a tissue Doppler imaging (TDI) wall motion technique. Healthy subjects had their arteries insonated at the same sitting by two different observers and at two different sittings by the same observer. From 32 subjects in the reproducibility study, within-scan coefficient of variation (CV) was 4.5%. Intraobserver between-scan CV for E was 12.7% and for Ep 11.0%. Interobserver CVs were 8.3% and 9.3%, respectively. TDI is a reproducible, valid and highly sensitive direct assessment of arterial wall parameters. It is at least as reproducible as other ultrasound based methods for assessing arterial stiffness and also provides increased information about the arterial distension waveform.
authors.affiliation: Department of Vascular Surgery, University of Birmingham, Heart of England NHS Foundation Trust, Birmingham, UK. martin@claridge.org.uk
authors.forename: Martin W
authors.initials: MW
authors.lastname: Claridge
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Bate
authors.forename: Jude A
authors.initials: JA
authors.lastname: Dineley
authors.forename: Peter R
authors.initials: PR
authors.lastname: Hoskins
authors.forename: Tim
authors.initials: T
authors.lastname: Marshall
authors.forename: Donald A
authors.initials: DA
authors.lastname: Adam
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Bradbury
authors.forename: Antonius B
authors.initials: AB
authors.lastname: Wilmink
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001795:Blood Pressure Determination; D001916:Brachial Artery / Q000503:physiopathology; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004548:Elasticity; D006801:Humans; D008875:Middle Aged; D015588:Observer Variation; D015203:Reproducibility of Results; D017539:Tunica Intima / Q000000981:diagnostic imaging; D017540:Tunica Media / Q000000981:diagnostic imaging; D018608:Ultrasonography, Doppler / Q000379:methods*