Effects of elastic compression stockings on wall shear stress in deep and superficial veins of the calf
| Autor: | Alun D. Hughes, X. Yun Xu, David N. Firmin, Steven P. Downie, John H.N. Wolfe, Kim H. Parker, S Raynor, Nigel B. Wood, Simon A. McG. Thom |
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| Rok vydání: | 2008 |
| Předmět: |
Adult
Male Materials science Time Factors Physiology Hemodynamics Stocking Reference Values Physiology (medical) Image Interpretation Computer-Assisted medicine Shear stress Prone Position Humans Computer Simulation Saphenous Vein Vein Leg Respiration Great saphenous vein Models Cardiovascular Anatomy Compression (physics) Tibial Vein medicine.anatomical_structure medicine.vein Regional Blood Flow Ultrasonography Doppler Pulsed cardiovascular system Posterior tibial vein Stress Mechanical Cardiology and Cardiovascular Medicine Blood Flow Velocity Magnetic Resonance Angiography Stockings Compression Biomedical engineering |
| Zdroj: | American journal of physiology. Heart and circulatory physiology. 294(5) |
| ISSN: | 0363-6135 |
| Popis: | The purpose of this study was to estimate wall shear stress (WSS) in individual vessels of the venous circulation of the calf and quantify the effects of elastic compression based on change of vessel geometry and velocity waveform. The great saphenous vein and either a peroneal or posterior tibial vein have been imaged in four healthy subjects using magnetic resonance imaging, with and without the presence of a grade 1 medical stocking. Flow through image-based reconstructed geometries was numerically simulated for both a range of steady flow rates and ultrasound-derived transient velocity waveforms, scaled to give a standardized time averaged flow rate. For steady flow, the stocking produced an average percentage increase in mean WSS of ∼100% in the great saphenous vein across a range of 0.125–1.25 ml/s. The percentage increase in the peroneal/posterior tibial veins varied from 490 to 650% across a range of 0.5–5 ml/s. In addition, application of the stocking eliminated periods of very low or zero flow from the transient waveforms. The average minimum value of WSS in all vessels without the stocking was |
| Databáze: | OpenAIRE |
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