Results 181 to 190 of about 3,313,018 (220)

Comparison of Static and Dynamic Cerebral Autoregulation Measurements

Stroke, 1995
Background and Purpose Cerebral autoregulation can be evaluated by measuring relative blood flow changes in response to a steady-state change in the blood pressure (static method) or during the response to a rapid change in blood pressure (dynamic method).
Rune Aaslid, David W Newell, Arthur M Lam   +2 more
exaly   +4 more sources

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Dynamic cerebral autoregulation in healthy adolescents

Acta Anaesthesiologica Scandinavica, 2002
Background: There is little information on the limits of cerebral autoregulation and the autoregulatory capacity in children. The aim of this study was to compare dynamic cerebral autoregulation between healthy adolescents and adults.Methods: Seventeen healthy volunteers 12–17 years (n = 8) and 25–45 years (n = 9) were enrolled in this study. Bilateral
M S, Vavilala, D W, Newell, E, Junger, C M, Douville, R, Aaslid, F P, Rivara, A M, Lam   +6 more
exaly   +3 more sources

Dynamic cerebral autoregulation is preserved in neurally mediated syncope

Journal of Applied Physiology, 2001
To test whether cerebral autoregulation is impaired in patients with neurally mediated syncope (NMS), we evaluated 15 normal subjects and 37 patients with recurrent NMS. Blood pressure (BP), heart rate, and cerebral blood velocity (CBV) (transcranial Doppler) were recorded at rest and during 80° head-up tilt (HUT).
R, Schondorf, R, Stein, R, Roberts, J, Benoit, W, Cupples   +4 more
openaire   +3 more sources

Impaired dynamic cerebral autoregulation in patients with cerebral amyloid angiopathy

Brain Research, 2019
Cerebral amyloid angiopathy (CAA) might disturb the sensitive mechanism of cerebral pressure autoregulation. This study examines whether dynamic cerebral autoregulation (CA) is impaired in the posterior or anterior circulation of CAA patients. Fifteen patients with known CAA on magnetic resonance imaging (MRI) and 14 age-matched controls were examined ...
Horst Urbach, Arthur Allignol, Cornelius Weiller   +2 more
exaly   +4 more sources

Dynamic cerebral autoregulation during exhaustive exercise in humans

American Journal of Physiology - Heart and Circulatory Physiology, 2005
We investigated whether dynamic cerebral autoregulation is affected by exhaustive exercise using transfer-function gain and phase shift between oscillations in mean arterial pressure (MAP) and middle cerebral artery (MCA) mean blood flow velocity ( Vmean).
Shigehiko Ogoh, Ellen Dawson, David M Keller   +2 more
exaly   +3 more sources

Phase dynamics in cerebral autoregulation

American Journal of Physiology-Heart and Circulatory Physiology, 2005
Complex continuous wavelet transforms are used to study the dynamics of instantaneous phase difference Δφ between the fluctuations of arterial blood pressure (ABP) and cerebral blood flow velocity (CBFV) in a middle cerebral artery. For healthy individuals, this phase difference changes slowly over time and has an almost uniform distribution for the ...
Miroslaw, Latka, Malgorzata, Turalska, Marta, Glaubic-Latka, Waldemar, Kolodziej, Dariusz, Latka, Bruce J, West   +5 more
openaire   +2 more sources

Cerebral Autoregulation Dynamics in Premature Newborns

Stroke, 1995
Background and Purpose Autoregulation of cerebral blood flow is easily disrupted, and loss of this normal physiological reflex may worsen the neurological outcome for patients undergoing intensive care. We studied the response of cerebral blood flow velocity to changes in mean arterial blood pressure.
R B, Panerai, A W, Kelsall, J M, Rennie, D H, Evans   +3 more
openaire   +2 more sources

Dynamic cerebral autoregulation is impaired in glaucoma

Journal of the Neurological Sciences, 2004
Autonomic and endothelial dysfunction is likely to contribute to the pathophysiology of normal pressure glaucoma (NPG) and primary open angle glaucoma (POAG). Although there is evidence of vasomotor dysregulation with decreased peripheral and ocular blood flow, cerebral autoregulation (CA) has not yet been evaluated.
Marcin, Tutaj, Clive M, Brown, Miroslaw, Brys, Harald, Marthol, Martin J, Hecht, Matthias, Dutsch, Georg, Michelson, Max J, Hilz   +7 more
openaire   +2 more sources

Assessment of dynamic changes in cerebral autoregulation

Biomedizinische Technik/Biomedical Engineering, 2007
Cerebral autoregulation (CA) is a control mechanism that adjusts cerebral vasomotor tone in response to changes in arterial blood pressure (ABP) to ensure a nearly constant cerebral blood flow. Patient treatment could be optimized if CA monitoring were possible.
Frank, Noack, Melanie, Christ, Sven-Axel, May, Ralf, Steinmeier, Ute, Morgenstern   +4 more
openaire   +2 more sources

Impaired dynamic cerebral autoregulation in eclampsia

Ultrasound in Obstetrics & Gynecology, 2003
AbstractEclampsia is frequently associated with brain edema, cerebral infarction or hemorrhage. Its underlying cerebrovascular pathophysiology is still poorly understood. We examined cerebral autoregulation by a non‐invasive multimodal assessment in a 28‐year‐old primaparous woman with postpartal eclampsia.
E, Oehm, M, Reinhard, C, Keck, T, Els, J, Spreer, A, Hetzel   +5 more
openaire   +2 more sources