Document Detail

Duplex scanning for diagnosis of peripheral arterial disease.
MedLine Citation:
PMID:  3061918     Owner:  NLM     Status:  MEDLINE    
At the beginning of the 1970's, duplex scanning was developed to delineate arteriosclerotic changes in the region of the carotid bifurcation. Technical improvements subsequently enabled duplex scanning for evaluation of the peripheral arterial system, the mesenteric arteries and lastly, the renal arteries and the deep veins. Ultrasonic frequencies between 2.5 and 10 MHz are necessary for image processing. The B-image alone is not sufficient to assess the severity of stenoses, however, it serves as a guide for positioning the sample volume to analyze the segmental changes in velocity. Based on the flow profile, the degree of stenosis is classified as normal, 1 to 19%, 20 to 49%, 50 to 99% and total occlusion. The blood vessels of each leg are divided into seven segments and the results of duplex scanning and concurrently performed angiography in a total of 50 patients were compared. The duplex sonographic results were superior to those obtained with angiography as determined by two independent observers. Angiography remains the decisive method if surgical or angioplastic methods are considered. The angiographic assessment of stenosis severity in one plane only is however a matter regarded with increasing criticism. Consequently, duplex sonographic measurements of the pressure gradient at rest and after vasodilatation have been carried out and hemodynamic relevance specified by the criteria of a pressure gradient of more than 10 mm Hg at rest and 20 mm Hg after injection of papaverine. As compared with sonographic evaluation of aorto-iliac segments, the angiographic assessment yielded a relatively high rate of false positive and false negative findings. Duplex scanning appears to be a meaningful alternative for assessment of stenosis severity.
D E Strandness
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Herz     Volume:  13     ISSN:  0340-9937     ISO Abbreviation:  Herz     Publication Date:  1988 Dec 
Date Detail:
Created Date:  1989-02-17     Completed Date:  1989-02-17     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7801231     Medline TA:  Herz     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  372-7     Citation Subset:  IM    
University of Washington, School of Medicine, Department of Surgery, Seattle.
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MeSH Terms
Aorta, Abdominal
Aortic Diseases / diagnosis
Arterial Occlusive Diseases / diagnosis*
Arteriosclerosis / diagnosis
Blood Flow Velocity
Ischemia / diagnosis
Leg / blood supply
Prospective Studies
Ultrasonography / methods*

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

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