Investigations into the relationship between hemodynamics and vascular alterations in an established arteriovenous fistula
| Autor: | Cécile Legallais, Marianne Fenech, I. Claude, J.M. Treutenaere, Zaher Kharboutly |
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| Přispěvatelé: | Biomécanique et génie biomédical (BIM), Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
medicine.medical_specialty
Finite Element Analysis 0206 medical engineering Biomedical Engineering Biophysics Arteriovenous fistula Hemodynamics 02 engineering and technology 030204 cardiovascular system & hematology 03 medical and health sciences Arteriovenous Shunt Surgical Imaging Three-Dimensional 0302 clinical medicine Internal medicine Laser-Doppler Flowmetry medicine Shear stress Humans ComputingMilieux_MISCELLANEOUS Computed tomography angiography medicine.diagnostic_test business.industry Extracorporeal circulation Angiography Models Cardiovascular Calcinosis Blood flow Laser Doppler velocimetry medicine.disease 020601 biomedical engineering Pulsatile Flow Arteriovenous Fistula Cardiology Radiology Shear Strength business Blood Flow Velocity Calcification |
| Zdroj: | Medical Engineering and Physics Medical Engineering and Physics, Elsevier, 2007, 29, pp.999-1007 |
| ISSN: | 1350-4533 |
| Popis: | Arteriovenous fistula are specific vessels created by a vascular operation in order to provide sufficient blood access for extracorporeal circulation in hemodialysis. They are subject to numerous pathologies that may be caused by hemodynamic effects. To better understand these effects, a specific patient's arteriovenous fistula was reconstructed from computed tomography angiography. Computational fluid dynamics software made it possible to solve fluid mechanics equations under physiological conditions. An accurate map of unsteady velocity profiles and wall shear stress was drawn up. The computed velocity profiles were successfully confronted with Echo Doppler investigation. Selected regions with or without calcification, the end stage of wall alteration, were examined in terms of the mechanical constraints generated by blood flow. In contrast with other authors, we did not observe any association between calcification and areas of oscillating shear stress. Nevertheless, a statistical analysis of the whole vessel envelop and specific sites of calcification suggested a potential association between calcification and high temporal wall shear stress gradients. |
| Databáze: | OpenAIRE |
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