Daily rhythm of cerebral blood flow velocity
Journal of Circadian Rhythms, 2005 BACKGROUND: CBFV (cerebral blood flow velocity) is lower in the morning than in the afternoon and evening. Two hypotheses have been proposed to explain the time of day changes in CBFV: 1) CBFV changes are due to sleep-associated processes or 2) time of day changes in CBFV are due to an endogenous circadian rhythm independent of sleep.
Conroy, Deirdre A +2 more
openaire +6 more sources
The Importance of Velocity Acceleration to Flow-Mediated Dilation [PDF]
International Journal of Vascular Medicine, 2012 The validity of the flow-mediated dilation test has been questioned due to the lack of normalization to the primary stimulus, shear stress. Shear stress can be calculated using Poiseuille's law.
Stoner, Lee +3 more
core +3 more sources
Relationship between vascular resistance and sympathetic nerve fiber density in arterial vessels in children with sleep disordered breathing [PDF]
Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2017 Sleep disordered breathing in children is associated with increased blood flow velocity and sympathetic overactivity. Sympathetic overactivity results in peripheral vasoconstriction and reduced systemic vascular compliance, which increases blood flow ...
Baumert, M. +12 more
core +3 more sources
Computational fluid dynamicaccuracy in mimicking changes in blood hemodynamics in patients with acute type IIIb aortic dissection treated with TEVAR [PDF]
, 2018 Background: We aimed to verify the accuracy of the Computational Fluid Dynamics (CFD) algorithm for blood flow reconstruction for type IIIb aortic dissection (TBAD) before and after thoracic endovascular aortic repair (TEVAR).
Domenig, Christoph +5 more
core +1 more source
Confocal micro-PIV measurements of blood flow in microchannels [PDF]
, 2006 The detail measurements of velocity profiles of blood flow in microchannels are fundamental for a better understanding on the biomechanics of the microcirculation.
Lima, R. +3 more
core +1 more source
Pulsatile blood flow through a constricted porous artery [PDF]
, 2020 In this paper a speculative study of an incompressible Newtonian blood flow through a constricted porous channel and pulsatile nature is inspected. Porosity parameter λ is incorporated in the momentum equation.
Jamil, D. F. +5 more
core +1 more source
Comparison of reduced models for blood flow using Runge-Kutta discontinuous Galerkin methods
, 2016 One-dimensional blood flow models take the general form of nonlinear hyperbolic systems but differ greatly in their formulation. One class of models considers the physically conserved quantities of mass and momentum, while another class describes mass ...
Canic, Suncica +3 more
core +1 more source
Inert gas clearance from tissue by co-currently and counter-currently arranged microvessels [PDF]
, 2012 To elucidate the clearance of dissolved inert gas from tissues, we have developed numerical models of gas transport in a cylindrical block of tissue supplied by one or two capillaries. With two capillaries, attention is given to the effects of co-current
Bailey HR +15 more
core +2 more sources
Numerical-experimental observation of shape bistability of red blood cells flowing in a microchannel [PDF]
, 2017 Red blood cells flowing through capillaries assume a wide variety of different shapes owing to their high deformability. Predicting the realized shapes is a complex field as they are determined by the intricate interplay between the flow conditions and ...
Gekle, Stephan +4 more
core +2 more sources
In vivo photoacoustic flowmetry in the optical diffusive regime based on saline injection [PDF]
, 2016 We propose a saline-injection-based method to quantify blood flow velocity in vivo with acoustic-resolution photoacoustic tomography. By monitoring the saline-blood-interface propagating in the blood vessel, we can resolve the flow velocity.
Li, Guo +3 more
core +1 more source