Results 251 to 260 of about 445,834 (292)

Cerebrovascular Reactivity in Normal Pregnancy and Preeclampsia

Obstetrics & Gynecology, 2001
To compare cerebrovascular reactivity in normotensive and preeclamptic pregnant women.Transcranial Doppler ultrasound was used to measure peak, end-diastolic, and mean velocities in the middle cerebral arteries of 45 normotensive and 36 preeclamptic women in the third trimester.
S, Riskin-Mashiah, M A, Belfort, G R, Saade, J A, Herd   +3 more
openaire   +2 more sources

The Variability of Cerebrovascular Reactivity with Posture and Time

Journal of Neurosurgical Anesthesiology, 1996
Transcranial Doppler (TCD) ultrasonography has been used in a variety of clinical contexts to assess cerebrovascular reserve by measuring carbon dioxide reactivity. Reproducibility with time and altered position of the patient is examined in the present study. Carbon dioxide reactivity was determined in 10 healthy volunteers using TCD.
T S, Mayberg, A M, Lam, B F, Matta, E, Visco   +3 more
openaire   +2 more sources

Reduction of cerebrovascular reactivity during hypercapnia

American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1982
The effects on cerebral blood flow of alpha- or beta-adrenergic receptor stimulation of cerebral vessels were examined in 13 unanesthetized goats before and during hypercapnia produced by inhalation of 10% CO2 in air. This procedure increased the PCO2 from 34 to 52 and was accompanied by a fall in pH from 7.39 to 7.26.
A L, López de Pablo, M C, González, G, Dieguez, B, Gómez, S, Lluch   +4 more
openaire   +2 more sources

Cerebrovascular reactivity and dynamic autoregulation in tetraplegia

American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2010
Humans with spinal cord injury have impaired cardiovascular function proportional to the level and completeness of the lesion. The effect on cerebrovascular function is unclear, especially for high-level lesions. The purpose of this study was to evaluate the integrity of dynamic cerebral autoregulation (CA) and the cerebrovascular reactivity in ...
Luke C, Wilson, James D, Cotter, Jui-Lin, Fan, Rebekah A I, Lucas, Kate N, Thomas, Philip N, Ainslie   +5 more
openaire   +2 more sources

Critical Thresholds for Cerebrovascular Reactivity: Fact or Fiction?

Neurocritical Care, 2012
To the Editor, We read with interest the recent publication by Sorrentino et al. [1] entitled: ‘‘Critical Thresholds for Cerebrovascular Reactivity after Traumatic Brain Injury’’. The study is based on the hypothesis that bedside real-time calculation of the pressure-reactivity index (PRx) allows a continuous estimation of cerebral pressure ...
Nordström, Carl-Henrik, Nielsen, Troels Halfeld   +1 more
openaire   +2 more sources

Cerebrovascular Reactivity in Atrial Fibrillation

The FASEB Journal, 2017
Atrial fibrillation is associated with substantial risk of severe stroke, cognitive decline and dementia. Elevated plasma biomarkers of vascular damage/dysfunction and reduced conduit (brachial) artery function have been reported in atrial fibrillation.
James P Fisher, Igor Dutra Braz, Samuel J E Lucas, Louisa Edwards, Johannes J van Lieshout, Gregory Y H Lip   +5 more
openaire   +1 more source

Cerebrovascular reactivity impairment in resistant hypertension

Journal of Human Hypertension
Resistant hypertension (RH) is defined as office systolic blood pressure (BP) that remains uncontrolled despite the concurrent use of three or more antihypertensive drug classes and may be associated with altered vasomotor responses to physiological stimuli.
G. Miceli, M. Velardo, A. Casuccio, M. Daidone, M. G. Basso, A. Tuttolomondo   +5 more
openaire   +2 more sources

Effects of Bypas's on CO 2 Cerebrovascular Reactivity in Ischaemic Cerebrovascular Diseases - Based on the Intra-Operative LCBF and CO 2 Cerebrovascular Reactivity Studies

Acta Neurochirurgica, 1999
The authors evaluated the effects of superficial temporal to middle cerebral artery (STA-MCA) bypass on CO2 cerebrovascular reactivity (CVR) in ischaemic cerebrovascular diseases (CVDs). Local cerebral blood flow (LCBF) and CO2 CVR in 19 patients with ischaemic CVD subjected to standard STA-MCA bypasses were examined during surgery.
S, Kawaguchi, T, Sakaki, R, Uranishi
openaire   +2 more sources

Effect of dotarizine on CO2-dependent cerebrovascular reactivity

Acta Neurochirurgica, 1995
Dotarizine is chemically related to calcium antagonist cinnarizine and flunarizine. The study presented investigates the influence of the drug on the diameter of cortical arteries and cerebral blood velocity measured in the MCA in two groups of anaesthetized cats.
J, Chomicki, J, Jurkiewicz, W, Zabolotny, Z, Czernicki, J, Cervos-Navarro   +4 more
openaire   +2 more sources

Cerebrovascular reactivity to CO2: Modulation by arterial pressure

Experientia, 1985
Cerebrovascular reactivity to CO2 (CO2R), measured in halothane-anesthetized rabbits, decreased as arterial pressure was increased either pharmacologically or mechanically. On the other hand, hypotension, induced by bleeding, led to an increase in CO2R. These responses were unaffected by denervation of baroreceptors.
J D, Lifson, E H, Rubinstein, O U, Scremin, R R, Sonnenschein   +3 more
openaire   +2 more sources