Cerebral Blood Flow Velocities After Subarachnoid Haemorrhage in Relation to the Amount of Blood Clots in the Initial Computed Tomography

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.

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RENAL VERSUS CEREBRAL BLOOD FLOW VELOCITIES IN PRETERM INFANTS WITH PATENT DUCTUS ARTERIOSUS

Pediatric Research ◽

10.1203/00006450-198911000-00037 ◽

1989 ◽

Vol 26 (5) ◽

pp. 505-505

Author(s):

T Bõrnelburg ◽

G Jorch

Keyword(s):

Blood Flow ◽

Cerebral Blood Flow ◽

Patent Ductus Arteriosus ◽

Preterm Infants ◽

Ductus Arteriosus ◽

Blood Flow Velocities ◽

Patent Ductus ◽

Flow Velocities

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

Cephalalgia ◽

10.1177/0333102416658715 ◽

2016 ◽

Vol 37 (10) ◽

pp. 927-937 ◽

Cited By ~ 5

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.

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

Journal of Paediatrics and Child Health ◽

10.1111/jpc.13663 ◽

2017 ◽

Vol 54 (1) ◽

pp. 61-68 ◽

Cited By ~ 7

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

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

SLEEP ◽

10.1093/sleep/17.1.11 ◽

1994 ◽

Vol 17 (1) ◽

pp. 11-19 ◽

Cited By ~ 54

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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Effects of antenatal magnesium sulfate treatment on cerebral blood flow velocities in preterm neonates

Journal of Perinatology ◽

10.1038/jp.2013.182 ◽

2014 ◽

Vol 34 (3) ◽

pp. 192-196 ◽

Cited By ~ 9

Author(s):

E Y Imamoglu ◽

T Gursoy ◽

G Karatekin ◽

F Ovali

Keyword(s):

Blood Flow ◽

Cerebral Blood Flow ◽

Magnesium Sulfate ◽

Preterm Neonates ◽

Blood Flow Velocities ◽

Flow Velocities

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Normal values of cerebral blood flow velocities in neonates

Srpski arhiv za celokupno lekarstvo ◽

10.2298/sarh1004186v ◽

2010 ◽

Vol 138 (3-4) ◽

pp. 186-191 ◽

Cited By ~ 4

Author(s):

Brankica Vasiljevic ◽

Miroslava Gojnic ◽

Svjetlana Maglajlic-Djukic ◽

Olga Antonovic

Keyword(s):

Blood Flow ◽

Cerebral Blood Flow ◽

Normal Values ◽

Color Doppler ◽

Ductus Arteriosus ◽

Resistance Index ◽

Severe Hypotension ◽

The Mean ◽

Blood Flow Velocities ◽

Flow Velocities

Introduction. There was used color Doppler ultrasonography (cD-USI), allowing simultaneous examination of parenchymal and vascular cerebral structures. The evaluation of blood flow velocities in cerebral arteries is important in the assessment of cerebral circulation in hypoxic-ischaemic and haemorrhagic brain damage in neonates. Objective. The aim of this study was to estimate normal values of cerebral blood flow velocities (CBFV) and Doppler indices - pulsatility index (PI) and resistance index (RI) - in the anterior cerebral artery (ACA) during the first days of life in infants. Methods. CBFV, PI and RI were obtained during the first week of life with cD-US in 70 infants divided in four groups of gestational age (GA): ?28 gestational weeks (GW); 29-32 GW; 33-36 GW; and ?37 GW. Infants with congenital malformations, severe perinatal asphyxia, cerebral haemorrhagic lesion, DAP or severe hypotension were excluded. Results. The mean GA of infants was 34.5?5.5 GW (range 26-40 GW) and the mean birth weight (BW) was 2540?950 g (range 750-4000 g). In the 1st group of 10 infants, ?28 GW, the mean BW was 950?110 g and values of RI were 0.59?0.10 and PI 1.06?0.080. In the 2nd group of 20 infants, 29-32 GW, the mean BW was 1350?290 g and values of RI were 0.60?0.10 and PI 1.10?0.15. In the 3rd group of 20 infants, 33-36 GW, the mean BW was 1950?750 g and values of RI were 0.63?0.08 and PI 1.15?0.30. In the 4th group of 20 infants, ?37 GW, the mean BW was 3540?950 g and values of RI were 0.65?0.05 and PI 1.18?0.35. Conclusion. Values of CBFV progressively increase with GA and BW due to progressive increase of cardiac output, blood pressure and closing of ductus arteriosus. Values of RI and PI gradually increase with GA and BW as a result of progressive maturation and opening of vascular cerebral bed with a reduction of the cerebrovascular resistance.

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