| Interobserver variation in duplex scanning of infrainguinal arterial bypass grafts. | |
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MedLine Citation:
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PMID: 12623333 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: to determine the degree of interobserver variation of color-flow duplex scanning of infrainguinal arterial bypass grafts. METHODS: two experienced vascular technologists randomly assessed bypass grafts in 32 consecutive patients, using a color-flow duplex scan. In pre-defined segments the highest peak systolic velocity (PSV(max)) and end-diastolic velocity (EDV) were measured and a peak systolic velocity ratio (PSV ratio) was calculated. Results were analyzed as continuous variables (Bland and Altman plots and Intraclass Correlation Coefficient=ICC) and also as categorical data (weighted Kappa coefficient) for the PSV ratio 1-2.5, > or =2.5-4, > or =4.0. RESULTS: the ICC for the PSV(max), PSV ratio and EDV indicated "almost perfect" agreement for all three parameters. However, the Bland and Altman plots showed impressive interobserver variation for the higher values of all three parameters. For the PSV ratio categories a weighted kappa of 0.31 was calculated, indicating only fair agreement. Substantial variation was found for the categories with PSV ratios > or =2.5-4.0 and > or =4.0. CONCLUSION: though performing accurately for the lower values of the assessed parameters, duplex scanning shows considerable interobserver variation for the clinically significant higher values. Particularly in the PSV ratio interval > or =2.5-4.0, most relevant for clinical decision-making, the interobserver variability is unacceptable. |
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Authors:
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M E R Gomes; J C de Graaff; J A van Gurp; I Zwiers; D A Legemate |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery Volume: 25 ISSN: 1078-5884 ISO Abbreviation: Eur J Vasc Endovasc Surg Publication Date: 2003 Mar |
Date Detail:
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Created Date: 2003-03-07 Completed Date: 2003-03-31 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9512728 Medline TA: Eur J Vasc Endovasc Surg Country: England |
Other Details:
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Languages: eng Pagination: 224-8 Citation Subset: IM |
Affiliation:
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Department of Surgery, Academical Medical Center, Amsterdam, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Arterial Occlusive Diseases / surgery, ultrasonography Arteries / transplantation, ultrasonography* Blood Flow Velocity Blood Vessel Prosthesis Blood Vessel Prosthesis Implantation* Graft Occlusion, Vascular / physiopathology, ultrasonography* Humans Lower Extremity / blood supply* Observer Variation Reproducibility of Results Ultrasonography, Doppler, Color* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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