The Doppler Principle Applied to Measurement of Blood Flow Velocity in Cerebral Arteries

1986 ◽  
pp. 22-38 ◽  
Author(s):  
R. Aaslid
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Arteries

scholarly journals Antimigraine drug sumatriptan increases blood flow velocity in large cerebral arteries during migraine attacks

Neurology ◽  
1992 ◽  
Vol 42 (8) ◽  
pp. 1522-1522 ◽  
Author(s):  
J.F.V. Caekebeke ◽  
M. D. Ferrari ◽  
C. P. Zwetsloot ◽  
J. Jansen ◽  
P. R. Saxena
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Arteries

scholarly journals Effects of GV14 Acupuncture on Cerebral Blood Flow Velocity in the Basilar and Middle Cerebral Arteries and CO2 Reactivity during Hypercapnia in Normal Individuals

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Hyun Ku Lee ◽  
Sang-Kwan Moon ◽  
Chul Jin ◽  
Seung-Yeon Cho ◽  
Seong-Uk Park ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Arteries ◽  
Transcranial Doppler Sonography ◽  
Cerebrovascular Reactivity ◽  
Acupuncture Points ◽  
Co2 Reactivity ◽  
Middle Cerebral Arteries

The Governing Vessel 14 (GV14) (Dazhui) is one of the acupuncture points referred to as “seven acupoints for stroke.” Nevertheless, there is a scarcity of research on the effects of acupuncture treatment at GV14. This study investigated the effects of acupuncture at GV14 on cerebral blood flow (CBF), especially that in the basilar artery (BA) and the middle cerebral arteries (MCA). Sixteen healthy men aged 20 to 29 years were enrolled in this study. CBF velocity and cerebrovascular reactivity (CVR) were measured using transcranial Doppler sonography (TCD). The following were assessed: closed circuit rebreathing- (CCR-) induced carbon dioxide (CO2) reactivity, modified blood flow velocity at 40 mmHg (CV40) on BA and MCAs, blood pressure (BP), and heart rate (HR). Observed results were obtained after comparison with the baseline evaluation. Statistically significant elevations in CO2 reactivity were recorded in the BA (3.28 to 4.70, p < 0.001 ) and MCAs (right: 3.81 to 5.25, p = 0.001 ; left: 3.84 to 5.12, p = 0.005 ) after acupuncture at GV14. The CV40 increased statistically significantly only in the BA (45.49 to 50.41, p = 0.003 ). No change was observed in BP (106.83 to 107.08 (mmHg), p = 0.335 ) and HR (77 to 75 (bpm), p = 0.431 ). Acupuncture at GV14 improved CBF velocity. These results could be explained by the regulation of endothelium-dependent vessel dilation effected by acupuncture. This trial is registered with Korean Clinical Trial Registry (http://cris.nih.go.kr; registration number: KCT0004787).

Changes in blood flow velocity in the middle and anterior cerebral arteries evoked by walking

2002 ◽  
Vol 30 (3) ◽  
pp. 132-138 ◽  
Author(s):  
Krassen Nedeltchev ◽  
Marcel Arnold ◽  
Arto Nirkko ◽  
Mathias Sturzenegger ◽  
Frank Rihs ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Arteries

Influence of ethanol on blood flow velocity in main cerebral arteries: Experimental transcranial doppler study in humans

1997 ◽  
Vol 99 ◽  
pp. S138
Author(s):  
T. Pietilä ◽  
R. Stendel ◽  
B. Irnich ◽  
A. Abo al Hassan ◽  
J. Zabramski ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Transcranial Doppler ◽  
Blood Flow Velocity ◽  
Cerebral Arteries ◽  
Doppler Study

scholarly journals HEMODYNAMIC AND BIOELECTRICAL PROPERTIES OF THE BRAIN IN YOUNGER ADULTS WITH NONSTABLE BLOOD PRESSURE

2014 ◽  
Vol 13 (2) ◽  
pp. 12-17
Author(s):  
G. G. Efremushkin ◽  
T. V. Filippova ◽  
A. G. Kharlova ◽  
V. V. Dekhar
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Arteries ◽  
Bioelectrical Activity ◽  
Younger Adults ◽  
Flow Energy ◽  
Blood Filling ◽  
The Brain

Aim.To study macro- and microhemodynamics and bioelectrical properties of the brain in younger adults with nonstable blood pressure (BP).Material and methods.A population of 79 adults at the age of 19–24 (average 19,9±0,9 years) was examined. According to the BP level they were divided into two groups: 1–46 (58,5%) with stable normal BP (SNBP), and 2–33 (41,5%) with high normal BP inside the range for 1stlevel arterial hypertension, whose BP was not stable (UsBP), but changing from normal values to 1st level hypertension. All patients undergone investigation of brachiocephal and intracerebral vessels with blood flow velocity measurement along the vessel direction, the blood sectional volumetric flow and specific kinetic energy. Microcirculation in the brain was measured by rheoencephalography including parameters of the velocity, time and volumetric parameters. Bioelectricity studied by electroencephalography.Results.In patients with UsBP we found the increase of blood flow velocity, blood volume and specific kinetic flow energy in vertebral and general carotid arteries as in basilar and middle cerebral arteries to. In the area of microcirculation in patients with UsBP the blood filling of frontal lobes was decreased comparing to SNBP patients in whom blood filling showed “mosaic” pattern. In UsBP patients we found changes of bioelectrical activity which are related to the functioning of cortical and subcortical portions of the brain.Conclusion.In younger patients with UsBP there is developed discirculatory encephalopathy with damage of cortex and subcortical portions of the brain due to impaired hemodynamic and microcirculation.

Influence of Smoking Cigarettes on Cerebral Blood Flow Parameters

2013 ◽  
Vol 17 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Jan Kochanowicz ◽  
Jolanta Lewko ◽  
Robert Rutkowski ◽  
Grzegorz Turek ◽  
Andrzej Sieskiewicz ◽  
...  
Keyword(s):  
Blood Flow ◽  
Flow Velocity ◽  
Cerebral Artery ◽  
Blood Flow Velocity ◽  
Cerebral Arteries ◽  
Velocity Ratio ◽  
Peak Systolic Velocity ◽  
Flow Parameters ◽  
Diastolic Velocity ◽  
Increased Risk

Introduction: While chronic cigarette smoking can lead to increased risk of stroke, the acute effects of smoking have not been established. We studied the changes in blood flow parameters in the major cerebral arteries caused by smoking one cigarette. Method: Using transcranial color-coded sonography (TCCS), we studied the anterior cerebral artery (ACA), middle cerebral artery (MCA), posterior cerebral artery (PCA), and the internal carotid artery (ICA) of 36 healthy male volunteers before and after they smoked one cigarette. Results: Blood flow velocity increased to a different degree in all but one of the arteries examined after participants smoked a single cigarette: The end diastolic velocity increased significantly by 7.8% in the PCA, 8% in the ACA, and 14.4% in the MCA. The peak systolic velocity increased significantly by 7.5% in the MCA. Blood flow velocity remained unchanged in the ICA only. Blood pressure and heart rate increased as did the flow velocity ratio for the MCA/ICA. The pulsatility index decreased after smoking from 0.92 ± 0.13 to 0.87 ± 0.14 in the MCA, 0.93 ± 0.15 to 0.87 ± 0.13 in the ACA, and 0.95 ± 0.17 to 0.89 ± 0.16 in the PCA. Conclusions: The results suggest that the direct effect of smoking on cerebral circulation includes peripheral vasodilatation with possible constriction of the main trunk of the basal cerebral arteries.

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