Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF
Vascular access required to perform a dialysis treatment need to construct an arteriovenous fistula, though it has a problem of stenosis. It is considered to be caused by the influence of wall shear stress on the blood vessel wall. Recently, the influence of flow disturbance is also focused on as on...
| Main Authors: | , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2020-09-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/86/890/86_20-00198/_pdf/-char/en |
| _version_ | 1811308690144231424 |
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| author | Yuga NARA Kazuyuki TODA |
| author_facet | Yuga NARA Kazuyuki TODA |
| author_sort | Yuga NARA |
| collection | DOAJ |
| description | Vascular access required to perform a dialysis treatment need to construct an arteriovenous fistula, though it has a problem of stenosis. It is considered to be caused by the influence of wall shear stress on the blood vessel wall. Recently, the influence of flow disturbance is also focused on as one of the causes, and is usually evaluated by the indexes such as TAWSS, transWSS, OSI and RRT. However, the correspondence of these indexes to the characteristic of flow disturbance is not clear. In the present study, these indexes are investigated with two different turbulence intensities, one is composed of fluctuation from the time averaged velocity, and the other is from the phase (ensemble) averaged velocity. As a result, it was found that TAWSS could estimate the extent of pulsatile flow unsteadiness, but the flow disturbance could not. TransWSS could evaluate the intensity of flow disturbance, only under the condition of high correlation between fluctuating velocity perpendicular to the main-flow and that parallel to the main-flow. Therefore, we formulated a new index capable of evaluating the disturbance with any characteristics. The new index shows reasonable performance for the purpose, althought it requires further improvement such as a formulation without post-processing using historical data. |
| first_indexed | 2024-04-13T09:27:46Z |
| format | Article |
| id | doaj.art-6b3dcc96dbc449a3a6f305b1b7b91705 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T09:27:46Z |
| publishDate | 2020-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-6b3dcc96dbc449a3a6f305b1b7b917052022-12-22T02:52:22ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612020-09-018689020-0019820-0019810.1299/transjsme.20-00198transjsmeNumerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVFYuga NARA0Kazuyuki TODA1Graduate School of Engineering, Nagoya Institute of TechnologyFaculty of Risk and Crisis Management, Chiba Institute of ScienceVascular access required to perform a dialysis treatment need to construct an arteriovenous fistula, though it has a problem of stenosis. It is considered to be caused by the influence of wall shear stress on the blood vessel wall. Recently, the influence of flow disturbance is also focused on as one of the causes, and is usually evaluated by the indexes such as TAWSS, transWSS, OSI and RRT. However, the correspondence of these indexes to the characteristic of flow disturbance is not clear. In the present study, these indexes are investigated with two different turbulence intensities, one is composed of fluctuation from the time averaged velocity, and the other is from the phase (ensemble) averaged velocity. As a result, it was found that TAWSS could estimate the extent of pulsatile flow unsteadiness, but the flow disturbance could not. TransWSS could evaluate the intensity of flow disturbance, only under the condition of high correlation between fluctuating velocity perpendicular to the main-flow and that parallel to the main-flow. Therefore, we formulated a new index capable of evaluating the disturbance with any characteristics. The new index shows reasonable performance for the purpose, althought it requires further improvement such as a formulation without post-processing using historical data.https://www.jstage.jst.go.jp/article/transjsme/86/890/86_20-00198/_pdf/-char/enarteriovenous fistulapulsatile flowdisturbed flowwall shear stresstime averaged wall shear stresstransverse wall shear stressoscillatory shear index |
| spellingShingle | Yuga NARA Kazuyuki TODA Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF Nihon Kikai Gakkai ronbunshu arteriovenous fistula pulsatile flow disturbed flow wall shear stress time averaged wall shear stress transverse wall shear stress oscillatory shear index |
| title | Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF |
| title_full | Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF |
| title_fullStr | Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF |
| title_full_unstemmed | Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF |
| title_short | Numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in AVF |
| title_sort | numerical study on relationship of each index for disturbance to turbulence characteristics in hemodynamics in avf |
| topic | arteriovenous fistula pulsatile flow disturbed flow wall shear stress time averaged wall shear stress transverse wall shear stress oscillatory shear index |
| url | https://www.jstage.jst.go.jp/article/transjsme/86/890/86_20-00198/_pdf/-char/en |
| work_keys_str_mv | AT yuganara numericalstudyonrelationshipofeachindexfordisturbancetoturbulencecharacteristicsinhemodynamicsinavf AT kazuyukitoda numericalstudyonrelationshipofeachindexfordisturbancetoturbulencecharacteristicsinhemodynamicsinavf |