Results 31 to 40 of about 29,744 (154)

The aging brain and cerebrovascular reactivity

NeuroImage, 2018
Cerebrovascular reactivity (CVR) is a measure of vascular response to a vasoactive stimulus, and can be used to assess the health of the brain vasculature. In this current study we used different analyses of BOLD fMRI responses to CO2 to provide a number of metrics including ramp and step CVR, speed of response and transfer function analysis (TFA).
Larissa McKetton, Olivia Sobczyk, James Duffin, Julien Poublanc, Kevin Sam, Adrian P. Crawley, Lakshmikumar Venkatraghavan, Joseph A. Fisher, David J. Mikulis   +8 more
openaire   +2 more sources

Cerebrovascular reactivity in migraineurs

Headache Medicine, 2011
Cerebrovascular reactivity (CR) assessed by transcranial Doppler (TCD) has been evaluated among migraineurs with conflicting results. We assessed the CR using the breath holding index (BHI) among 228 migraineurs during ictal or interictal phase and 56 controls.
Arthur de Carvalho Jatobá e Sousa, Ciro Martins Gomes, Rodolfo de Souza Coelho, Ricardo Afonso Teixeira   +3 more
openaire   +1 more source

Neckties and Cerebrovascular Reactivity in Young Healthy Males: A Pilot Randomised Crossover Trial

Stroke Research and Treatment, 2011
Background. A necktie may elevate intracranial pressure through compression of venous return. We hypothesised that a tight necktie would deleteriously alter cerebrovascular reactivity. Materials and Methods.
Mark Rafferty, Terence J. Quinn, Jesse Dawson, Matthew Walters   +3 more
doaj   +1 more source

Impaired Cerebrovascular Reactivity in Multiple Sclerosis [PDF]

JAMA Neurology, 2014
Cerebrovascular reactivity (CVR) is an inherent indicator of the dilatory capacity of cerebral arterioles for a vasomotor stimulus for maintaining a spontaneous and instant increase of cerebral blood flow (CBF) in response to neural activation. The integrity of this mechanism is essential to preserving healthy neurovascular coupling; however, to our ...
Olga, Marshall, Hanzhang, Lu, Jean-Christophe, Brisset, Feng, Xu, Peiying, Liu, Joseph, Herbert, Robert I, Grossman, Yulin, Ge   +7 more
openaire   +2 more sources

Evaluation of cerebrovascular reactivity in chronic hepatitis C patients using transcranial color Doppler.

PLoS ONE, 2019
Hepatitis C viral (HCV) infection is associated with systemic inflammation and metabolic complications that might predispose patients to atherosclerosis, including cerebrovascular atherosclerosis.
Mirela Pavicic Ivelja, Ivo Ivic, Kresimir Dolic, Antonio Mestrovic, Nikola Perkovic, Stipan Jankovic   +5 more
doaj   +1 more source

Associations Between Intracranial Pressure Extremes and Continuous Metrics of Cerebrovascular Pressure Reactivity in Acute Traumatic Neural Injury: A Scoping Review

Neurotrauma Reports
Cerebrovascular pressure reactivity plays a key role in maintaining constant cerebral blood flow. Unfortunately, this mechanism is often impaired in acute traumatic neural injury states, exposing the already injured brain to further pressure-passive ...
Kevin Y. Stein, Fiorella Amenta, Logan Froese, Alwyn Gomez, Amanjyot Singh Sainbhi, Nuray Vakitbilir, Younis Ibrahim, Abrar Islam, Tobias Bergmann, Izabella Marquez, Frederick A. Zeiler   +10 more
doaj   +3 more sources

Exercise breaks prevent attenuation in cerebrovascular function following an acute bout of uninterrupted sitting in healthy children

Experimental Physiology, 2023
The purpose of this study was to examine the effect of an acute bout of prolonged sitting with and without exercise breaks on cerebrovascular function in 7‐ to 13‐year‐old children.
Christine M. Tallon, Daniela Nowak‐Flück, Mathew G. Reiger, Daniel J. Green, Mark S. Tremblay, Phil N. Ainslie, Ali M. McManus   +6 more
doaj   +1 more source

The effect of age on cerebral blood flow responses during repeated and sustained stand to sit transitions

Physiological Reports, 2020
Introduction Aging is associated with impaired cerebrovascular blood flow and function, attributed to reduced vasodilatory capacity of the cerebrovascular network.
Timo Klein, Tom G. Bailey, Petra Wollseiffen, Stefan Schneider, Christopher D. Askew   +4 more
doaj   +1 more source

Factors affecting the determination of cerebrovascular reactivity

Brain and Behavior, 2014
AbstractBackground and PurposeCerebrovascular reactivity (CVR), measures the ability of the cerebrovasculature to respond to vasoactive stimuli such as CO2. CVR is often expressed as the ratio of cerebral blood flow change to CO2 change. We examine several factors affecting this measurement: blood pressure, stimulus pattern, response analysis and ...
Regan, Rosemary E, Fisher, Joseph A, Duffin, James   +2 more
openaire   +2 more sources

The dependence of CO₂ cerebrovascular reactivity (CVR) on caffeine. [PDF]

Imaging Neurosci (Camb)
Abstract Cerebrovascular reactivity (CVR) represents an important marker of brain vascular health, particularly in the context of small and large vessel diseases. However, an undesired feature of this measure is that there exist large variations in CVR values across individuals, which is mainly attributed to physiological factors.
Sankaralayam DS, Xu C, Hu Z, Moghekar A, Jiang D, Hu C, Liu P, Lu H.   +7 more
europepmc   +4 more sources