scholarly journals Surfactant Bolus Instillation: Effects of Different Doses on Blood Pressure and Cerebral Blood Flow Velocities

Neonatology ◽  
1994 ◽  
Vol 66 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Martin Rey ◽  
Hugo Segerer ◽  
Christiane Kiessling ◽  
Michael Obladen
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Blood Flow Velocities ◽  
Different Doses ◽  
Flow Velocities

Patterns of Cerebral Blood Flow and Systemic Hemodynamics During Arithmetic Processing

2008 ◽  
Vol 22 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Natalie Werner ◽  
Neval Kapan ◽  
Gustavo A. Reyes del Paso
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Time Course ◽  
Doppler Sonography ◽  
Transcranial Doppler Sonography ◽  
Systemic Hemodynamics ◽  
Heart Period ◽  
Blood Flow Velocities ◽  
Flow Velocities

The present study explored modulations in cerebral blood flow and systemic hemodynamics during the execution of a mental calculation task in 41 healthy subjects. Time course and lateralization of blood flow velocities in the medial cerebral arteries of both hemispheres were assessed using functional transcranial Doppler sonography. Indices of systemic hemodynamics were obtained using continuous blood pressure recordings. Doppler sonography revealed a biphasic left dominant rise in cerebral blood flow velocities during task execution. Systemic blood pressure increased, whereas heart period, heart period variability, and baroreflex sensitivity declined. Blood pressure and heart period proved predictive of the magnitude of the cerebral blood flow response, particularly of its initial component. Various physiological mechanisms may be assumed to be involved in cardiovascular adjustment to cognitive demands. While specific contributions of the sympathetic and parasympathetic systems may account for the observed pattern of systemic hemodynamics, flow metabolism coupling, fast neurogenic vasodilation, and cerebral autoregulation may be involved in mediating cerebral blood flow modulations. Furthermore, during conditions of high cardiovascular reactivity, systemic hemodynamic changes exert a marked influence on cerebral blood perfusion.

Whole blood viscosity and cerebral blood flow velocities in obese hypertensive or obese normotensive adolescents

2018 ◽  
Vol 31 (3) ◽  
pp. 275-281 ◽  
Author(s):  
Meltem Akcaboy ◽  
Bijen Nazliel ◽  
Tayfun Goktas ◽  
Serdar Kula ◽  
Bülent Celik ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebral Artery ◽  
Blood Viscosity ◽  
Whole Blood ◽  
Artery Blood Flow ◽  
Whole Blood Viscosity ◽  
Blood Flow Velocities ◽  
Flow Velocities

AbstractBackground:Obesity affects all major organ systems and leads to increased morbidity and mortality. Whole blood viscosity is an important independent regulator of cerebral blood flow. The aim of the present study was to evaluate the effect of whole blood viscosity on cerebral artery blood flow velocities using transcranial Doppler ultrasound in pediatric patients with obesity compared to healthy controls and analyze the effect of whole blood viscosity and blood pressure status to the cerebral artery blood flow velocities.Methods:Sixty patients with obesity diagnosed according to their body mass index (BMI) percentiles aged 13–18 years old were prospectively enrolled. They were grouped as hypertensive or normotensive according to their ambulatory blood pressure monitoring. Whole blood viscosity and middle cerebral artery velocities by transcranial Doppler ultrasound were studied and compared to 20 healthy same aged controls.Results:Whole blood viscosity values in hypertensive (0.0619±0.0077 poise) and normotensive (0.0607±0.0071 poise) groups were higher than controls (0.0616±0.0064 poise), with no significance. Middle cerebral artery blood flow velocities were higher in the obese hypertensive (73.9±15.0 cm/s) and obese normotensive groups (75.2±13.5 cm/s) than controls (66.4±11.5 cm/s), but with no statistical significance.Conclusions:Physiological changes in blood viscosity and changes in blood pressure did not seem to have any direct effect on cerebral blood flow velocities, the reason might be that the cerebral circulation is capable of adaptively modulating itself to changes to maintain a uniform cerebral blood flow.

Longitudinal changes in cerebral blood flow velocities in different clinical courses of migraine

Cephalalgia ◽  
2016 ◽  
Vol 37 (10) ◽  
pp. 927-937 ◽  
Author(s):  
Mi Ji Lee ◽  
Min Kyung Chu ◽  
Hanna Choi ◽  
Hyun Ah Choi ◽  
Chungbin Lee ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebral Artery ◽  
Posterior Cerebral Artery ◽  
Clinical Course ◽  
Episodic Migraine ◽  
Longitudinal Changes ◽  
Blood Flow Velocities ◽  
Headache Clinic ◽  
Flow Velocities

Objective To assess longitudinal changes in cerebral blood flow velocities (ΔCBFVs) according to the clinical course of migraine. Methods We retrospectively included migraine patients with two or more attacks per month at baseline who were followed up within 2 years with transcranial Doppler in a tertiary headache clinic. ΔCBFVs were analyzed in relation to clinical courses, defined as remission (0–1 headache days/month), persistence (2–14/month), or progression (≥15/month) in episodic migraine (EM), and conversion to EM (<15/month) and persistence (≥15/month) in chronic migraine (CM). Results A total of 166 patients (90 EM and 76 CM) were included. In EM, the remission group ( n = 30) showed a decrease in CBFV in the middle cerebral artery (MCA) and the basilar artery (BA). The progression group ( n = 10) showed increasing CBFVs in the bilateral MCAs. Patients with the persistence course ( n = 50) showed generally unchanged CBFVs. In CM, ΔCBFVs decreased in the BA and increased in the posterior cerebral artery (PCA) after conversion to EM ( n = 61), whereas they remained unchanged in the persistence group ( n = 15). In all patients, % change in headache days was positively correlated with the %ΔCBFVs of the bilateral MCAs and the BA. Conclusions CBFV changes are associated with the different clinical courses of migraine. The association is more prominent in EM than CM.

scholarly journals Cerebral blood flow velocities and cerebrovascular resistance in normal-term neonates in the first 72 hours

2017 ◽  
Vol 54 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Danielle E Forster ◽  
Emmanuel Koumoundouros ◽  
Virginia Saxton ◽  
Gabrielle Fedai ◽  
James Holberton
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Term Neonates ◽  
Cerebrovascular Resistance ◽  
Normal Term ◽  
Blood Flow Velocities ◽  
Flow Velocities

scholarly journals Relationship Between Cerebral Blood Flow Velocities and Cerebral Electrical Activity in Sleep

SLEEP ◽  
1994 ◽  
Vol 17 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Göran Hajak ◽  
Jürgen Klingelhöfer ◽  
Maria Schulz-Varszegi ◽  
Gernot Matzander ◽  
Dirk Sander ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Electrical Activity ◽  
Blood Flow Velocities ◽  
Flow Velocities
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