| Phasic flow patterns at a hemodialysis venous anastomosis. | |
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MedLine Citation:
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PMID: 3502767 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A phase-by-phase analysis of local flow patterns at the venous anastomosis of an arteriovenous hemodialysis angioaccess loop graft (AVLG) was made. The study was carried out in an elastic, transparent Silastic in vitro flow model, which duplicates the detail geometry of the AVLG obtained from an animal model (30+ kg dogs with 12 weeks bilateral femoral AVLG implantation). The flow model was installed in a mock pulsatile flow loop system designed to simulate physiological conditions. Flow visualization was made in laser-illuminated flow fields using a high-speed cine camera. Analysis of the high-speed cine indicates there is a distinct separation region downstream of the anastomotic toe in the median plane and a stagnation region that oscillates along the opposite wall. During inward motion of the vessel wall, accumulation of particles in the separation region and the nearby stagnation region is observed. A large swirl appears in the distal vein during end-systolic period. A double-helical flow pattern occurs further down in the distal vein. Retrograde flow in the distal vein occurs in an "oscillating" manner following each cardiac cycle. |
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Authors:
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M C Shu; G P Noon; N H Hwang |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Biorheology Volume: 24 ISSN: 0006-355X ISO Abbreviation: Biorheology Publication Date: 1987 |
Date Detail:
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Created Date: 1988-11-23 Completed Date: 1988-11-23 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0372526 Medline TA: Biorheology Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 711-22 Citation Subset: IM |
Affiliation:
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Cardiovascular Flow Dynamics Laboratory, University of Houston, Texas 77004. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arteriovenous Anastomosis / physiology* Blood Flow Velocity Dogs Models, Biological Pulsatile Flow Renal Dialysis* |
| Grant Support | |
ID/Acronym/Agency:
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HL33089/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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