Results 51 to 60 of about 1,347,814 (421)

Abnormal Cerebrovascular Reactivity in Patients with Parkinson’s Disease

Parkinson's Disease, 2015
Background. Orthostatic hypotension (OH) is an important nonmotor manifestation of Parkinson’s disease (PD). Changes in cerebrovascular reactivity may contribute to this manifestation and can be monitored using transcranial Doppler. Objective.
Carlos Henrique Ferreira Camargo, Eduardo Antunes Martins, Marcos Christiano Lange, Henrique Alvaro Hoffmann, Jissa Jeanete Luciano, Marcelo Rezende Young Blood, Marcelo Derbli Schafranski, Marcelo Machado Ferro, Edmar Miyoshi   +8 more
doaj   +1 more source

Reference ranges of fetal superior vena cava blood flow velocities and pulsatility index in the second half of pregnancy: a longitudinal study

BMC Pregnancy and Childbirth, 2021
Background Fetal superior vena cava (SVC) is essentially the single vessel returning blood from the upper body to the heart. With approximately 80-85% of SVC blood flow representing cerebral venous return, its interrogation may provide clinically ...
Maria Stefopoulou, Lotta Herling, Jonas Johnson, Peter Lindgren, Torvid Kiserud, Ganesh Acharya   +5 more
doaj   +1 more source

Extracorporeal Membrane Oxygenation and Cerebral Blood Flow Velocity in Children

Pediatric Critical Care Medicine, 2013
Objective: To determine how extracorporeal membrane oxygenation affects cerebral blood flow velocity and to determine whether specific changes in cerebral blood flow velocity may be associated with neurologic injury.
N. O'Brien, M. Hall
semanticscholar   +1 more source

Impaired endothelial function of the retinal vasculature in hypertensive patients [PDF]

, 2004
<p><b>Background and Purpose:</b> Arterial hypertension constitutes a central factor in the pathogenesis of stroke. We examined endothelial function of the retinal vasculature as a model of the cerebral circulation.</p> <p ...
Delles, C., Harazny, J., Hilgers, K.F., Michelson, G., Oehmer, S., Schmieder, R.E.   +5 more
core   +1 more source

Comparison of Blood Flow Velocity Quantification by 4D Flow MR Imaging with Ultrasound at the Carotid Bifurcation

American Journal of Neuroradiology, 2013
BACKGROUND AND PURPOSE: 4D flow MR imaging is an emerging technique that allows visualization and quantification of 3D blood flow in vivo. However, representative studies evaluating its accuracy are lacking.
A. Harloff, T. Zech, F. Wegent, C. Strecker, C. Weiller, M. Markl   +5 more
semanticscholar   +1 more source

Shape Optimization of hemolysis for shear thinning flows in moving domains [PDF]

arXiv, 2023
We consider the $3$D problem of shape optimization of blood flows in moving domains. Such a geometry is adopted to take into account the modeling of rotating systems and blood pumps for instance. The blood flow is described by generalized Navier-Stokes equations, in the particular case of shear-thinning flows.
arxiv  

Intracranial Flow Velocity Quantification Using Non-Contrast Four-Dimensional Flow MRI: A Prospective Comparative Study with Transcranial Doppler Ultrasound

Diagnostics, 2021
Four-dimensional (4D) flow magnetic resonance imaging (MRI) allows three-dimensional velocity encoding to measure blood flow in a single scan, regardless of the intracranial artery direction. We compared blood flow velocity quantification by non-contrast
Sam-Yeol Ha, Yeonah Kang, Ho-Joon Lee, Moonjung Hwang, Jiyeon Baik, Seongho Park   +5 more
doaj   +1 more source

INCREASED RETINAL BLOOD FLOW VELOCITY IN PATIENTS WITH EARLY DIABETES MELLITUS

Retina, 2012
Purpose: To compare retinal blood flow velocity in small vessels of patients with early diabetes mellitus (DM), without any morphologic changes related to diabetic retinopathy, with that in a control group.
Z. Burgansky-Eliash, A. Barak, Hila Barash, Darin A. Nelson, O. Pupko, A. Lowenstein, A. Grinvald, A. Rubinstein   +7 more
semanticscholar   +1 more source

Flow‐based immunomagnetic enrichment of circulating tumor cells from diagnostic leukapheresis product

Molecular Oncology, EarlyView.
The number of circulating tumor cells obtained from prostate cancer patients was increased approximately 5‐fold compared to regular CellSearch when processing 2 mL diagnostic leukapheresis material aliquots and increased by 44‐fold when processing 20 mL DLA aliquots using the flow enrichment target capture Halbach‐array.
Michiel Stevens, Anouk Mentink, Frank A. W. Coumans, Eshwari Dathathri, Khrystany T. Isebia, Jaco Kraan, Ronald de Wit, John W. M. Martens, Leon W. M. M. Terstappen   +8 more
wiley   +1 more source

Mathematical modeling of blood flow through arterial bifurcation [PDF]

arXiv, 2020
The blood vascular system consists of blood vessels such as arteries, arterioles, capillaries and veins that convey blood throughout the body. The pressure difference which exists between the ends of the vessels provides the living force required to the flow of blood.
arxiv