| Evaluation of blood access dysfunction based on a wavelet transform analysis of shunt murmurs. | |
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MedLine Citation:
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PMID: 16807812 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated shunt murmurs based on wavelet transform analysis as a new method for assessing vascular access function. In the present study, in patients with venous stenosis near an arteriovenous fistula (A-V fistula), a sensor was placed at different positions around the stenosis and shunt murmur signals obtained using a measurement system were subjected to time-frequency analysis based on wavelet transforms. The shunt murmurs obtained from the stenotic region closely represented some features of murmurs that are often referred to as "high-pitch" murmurs in the clinical setting. In contrast, shunt murmurs obtained about 5 cm downstream of the stenotic region closely represented some features of murmurs that are often referred to as "low-pitch" murmurs in the clinical setting. Furthermore, with the aim of extending the lifespan of arteriovenous grafts (A-V grafts) by detecting and treating stenotic lesions before the A-V graft becomes occluded, we evaluated the possibility of utilizing the present shunt murmur analysis for monitoring stenosis in such A-V grafts. When shunt murmurs from patients with A-V grafts were analyzed, the results suggested that the blood flow through the venous anastomosis of the graft was the most turbulent. This present method whereby blood flow in an A-V fistula is assessed based on the frequency distribution on a time-frequency plane by wavelet transform analysis is advantageous because findings are not markedly affected by sensor attachment. Furthermore, because the sensor is attached using an adhesive collar, measurements can be taken over a short period of time before each dialysis session. |
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Authors:
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Toshio Sato; Kiichi Tsuji; Norimichi Kawashima; Tetsuzo Agishi; Hiroshi Toma |
Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: Journal of artificial organs : the official journal of the Japanese Society for Artificial Organs Volume: 9 ISSN: 1434-7229 ISO Abbreviation: J Artif Organs Publication Date: 2006 |
Date Detail:
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Created Date: 2006-06-29 Completed Date: 2006-11-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9815648 Medline TA: J Artif Organs Country: Japan |
Other Details:
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Languages: eng Pagination: 97-104 Citation Subset: IM |
Affiliation:
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Department of Clinical Engineering, Faculty of Biomedical Engineering, Toin University of Yokohama, Yokohama 225-8502, Japan. toshio@cc.toin.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Anastomosis, Surgical* Blood* Heart Murmurs* Humans |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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