Document Detail


Ultrasonic measurement of abdominal aortic aneurysm wall compliance: a reproducibility study.
MedLine Citation:
PMID:  10709064     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The purpose of this study was to examine the intraobserver and interobserver error associated with ultrasonic echo-tracking compliance measurement in patients with abdominal aortic aneurysm.
METHODS: Two observers independently measured brachial blood pressure by sphygmomanometer and maximum aortic diameter, pressure strain elastic modulus (Ep) and stiffness using an ultrasonic echo-tracker. The observer was blind to several variables: pulse pressure, diameter change, Ep, and stiffness. In study 1, observer A measured compliance in 13 patients at 30 to 60 minutes apart. In study 2, observers A and B each measured compliance on 23 patients at two visits, 2 weeks apart.
RESULTS: There were no significant differences within observer A's compliance measurements. The coefficients of variation of method error (CV(ME)) for directly measured variables were systolic blood pressure, 7.3%; diastolic blood pressure, 5.4%; and maximum aortic diameter, 2.6%. CV(ME) values for derived variables were Ep, 21.2%, and stiffness, 17.6%. No differences were found between observers A and B and visits 1 and 2. CV(ME) values were 7.9% or less for directly measured variables and 32.7% or less for derived variables. These CV(ME) values were greatly reduced when the calculation was made with the use of log transformed data.
CONCLUSION: The high CV(ME) value for derived variables is largely due to their wide variation within this population. This technique can measure abdominal aortic aneurysm diameter and compliance with an acceptable level of intraobserver and interobserver error.
Authors:
K A Wilson; P R Hoskins; A J Lee; F G Fowkes; C V Ruckley; A W Bradbury
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of vascular surgery     Volume:  31     ISSN:  0741-5214     ISO Abbreviation:  J. Vasc. Surg.     Publication Date:  2000 Mar 
Date Detail:
Created Date:  2000-04-25     Completed Date:  2000-04-25     Revised Date:  2012-10-03    
Medline Journal Info:
Nlm Unique ID:  8407742     Medline TA:  J Vasc Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  507-13     Citation Subset:  IM    
Affiliation:
Vascular Surgery Unit, University Department of Clinical and Surgical Sciences, Royal Infirmary of Edinburgh, Edinburgh, Scotland, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Aorta, Abdominal / ultrasonography
Aortic Aneurysm, Abdominal / ultrasonography*
Blood Pressure
Brachial Artery / physiology
Humans
Observer Variation
Reproducibility of Results
Vascular Resistance

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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