scholarly journals Characteristics of arterial wall shear stress which cause endothelium‐dependent vasodilatation in the anaesthetized dog

2001 ◽  
Vol 531 (3) ◽  
pp. 843-848 ◽  
Author(s):  
H. M. Snow ◽  
F. Markos ◽  
D. O'Regan ◽  
K. Pollock
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Arterial Wall ◽  
Wall Shear ◽  
Anaesthetized Dog

scholarly journals Direct Assessment of Wall Shear Stress by Signal Intensity Gradient from Time-of-Flight Magnetic Resonance Angiography

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Kap-Soo Han ◽  
Sang Hyuk Lee ◽  
Han Uk Ryu ◽  
Se-Hyoung Park ◽  
Gyung-Ho Chung ◽  
...  
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Signal Intensity ◽  
Arterial Wall ◽  
Screening Method ◽  
Time Of Flight ◽  
Blood Flow Rate ◽  
Intensity Gradient ◽  
Tof Mra ◽  
Wall Shear

The aim of the study was to calculate the arterial wall signal intensity gradient (SIG) from time-of-flight MR angiography (TOF-MRA) and represent arterial wall shear stress. We developed a new algorithm that uses signal intensity (SI) of a TOF-MRA to directly calculate the signal intensity gradient (SIG). The results from our phantom study showed that the TOF-MRA SIG could be used to distinguish the magnitude of blood flow rate as high (mean SIG ± SD, 2.2 ± 0.4 SI/mm for 12.5 ± 2.3 L/min) and low (0.9 ± 0.3 SI/mm for 8.5 ± 2.6 L/min) in vessels (p<0.001). Additionally, we found that the TOF-MRA SIG values were highly correlated with various flow rates (β=0.96, p<0.001). Remarkably, the correlation coefficient between the WSS obtained from the computational fluid dynamics (CFD) analysis and the TOF-MRA SIG was greater than 0.8 in each section at the carotid artery (p<0.001 for all β values). This new technique using TOF-MRA could enable the rapid calculation of the TOF-MRA SIG and thereby the WSS. Thus, the TOF-MRA SIG can provide clinicians with an accurate and efficient screening method for making rapid decisions on the risk of vascular disease for a patient in clinical practice.

Computational modeling of coupled blood-wall mass transport of LDL: effects of local wall shear stress

2008 ◽  
Vol 294 (2) ◽  
pp. H909-H919 ◽  
Author(s):  
Ufuk Olgac ◽  
Vartan Kurtcuoglu ◽  
Dimos Poulikakos
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Arterial Wall ◽  
Density Lipoprotein ◽  
Filtration Velocity ◽  
Solute Flux ◽  
Ldl Transport ◽  
Low Shear Stress ◽  
Wall Shear ◽  
Low Shear

The work herein represents a novel approach for the modeling of low-density lipoprotein (LDL) transport from the artery lumen into the arterial wall, taking into account the effects of local wall shear stress (WSS) on the endothelial cell layer and its pathways of volume and solute flux. We have simulated LDL transport in an axisymmetric representation of a stenosed coronary artery, where the endothelium is represented by a three-pore model that takes into account the contributions of the vesicular pathway, normal junctions, and leaky junctions also employing the local WSS to yield the overall volume and solute flux. The fraction of leaky junctions is calculated as a function of the local WSS based on published experimental data and is used in conjunction with the pore theory to determine the transport properties of this pathway. We have found elevated levels of solute flux at low shear stress regions because of the presence of a larger number of leaky junctions compared with high shear stress regions. Accordingly, we were able to observe high LDL concentrations in the arterial wall in these low shear stress regions despite increased filtration velocity, indicating that the increase in filtration velocity is not sufficient for the convective removal of LDL.

Determination of arterial wall shear stress

2001 ◽  
Vol 44 (10) ◽  
pp. 1312-1321 ◽  
Author(s):  
Zhaorong Liu ◽  
Feng He ◽  
Gang Xu ◽  
Yong Chen
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Arterial Wall ◽  
Wall Shear

Loud Snores Reduce Carotid Peak Systolic Blood Velocity And Arterial Wall Shear Stress

2011 ◽  
Author(s):  
Jin Gun Cho ◽  
Manish Verma ◽  
George Larcos ◽  
Terence Amis ◽  
John Wheatley
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Arterial Wall ◽  
Blood Velocity ◽  
Wall Shear

Volumetric arterial wall shear stress calculation based on cine phase contrast MRI

2014 ◽  
Vol 41 (2) ◽  
pp. 505-516 ◽  
Author(s):  
Wouter V. Potters ◽  
Pim van Ooij ◽  
Henk Marquering ◽  
Ed vanBavel ◽  
Aart J. Nederveen
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Phase Contrast ◽  
Arterial Wall ◽  
Phase Contrast Mri ◽  
Stress Calculation ◽  
Wall Shear ◽  
Cine Phase Contrast

Measurement of systolic and diastolic arterial wall shear stress in the ascending aorta

2008 ◽  
Vol 24 (4) ◽  
pp. 196-203 ◽  
Author(s):  
Efstathios P. Efstathopoulos ◽  
George Patatoukas ◽  
Ioannis Pantos ◽  
Odysseas Benekos ◽  
Demosthenes Katritsis ◽  
...  
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Arterial Wall ◽  
Ascending Aorta ◽  
Wall Shear

The effect of wall motion on arterial wall shear stress

2006 ◽  
Vol 39 ◽  
pp. S445
Author(s):  
T. Fukui ◽  
K.H. Parker ◽  
K. Tsubota ◽  
S. Wada ◽  
T. Yamaguchi
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Wall Motion ◽  
Arterial Wall ◽  
Wall Shear
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