A transcranial Doppler study of blood flow velocity in the middle cerebral arteries performed at rest and during mental activities.

In this study, blood flow velocity in the basilar artery and both vertebral and middle cerebral arteries was measured with a transcranial Doppler device in 23 migraineurs during and outside a migraine attack. The aim of the study was to compare blood flow velocities during and outside an attack and to examine vascular reactivity to voluntary hyperventilation during both conditions. No differences in blood flow velocity were found. Although blood pressure was increased and end-expiratory CO2 decreased during the attack, this exerted no influence on blood flow velocity. Neither was a difference in vascular reactivity to voluntary hyperventilation detected between the two conditions. These findings support the notion of functional integrity of the examined large arteries during migraine attacks without aura.

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Transcranial Doppler Ultrasonography for Diagnosis of Cerebral Vasospasm After Aneurysmal Subarachnoid Hemorrhage: Mean Blood Flow Velocity Ratio of the Ipsilateral and Contralateral Middle Cerebral Arteries

Neurosurgery ◽

10.1227/neu.0b013e318222dc4c ◽

2011 ◽

Vol 69 (4) ◽

pp. 876-883 ◽

Cited By ~ 27

Author(s):

Ryuta Nakae ◽

Hiroyuki Yokota ◽

Daizo Yoshida ◽

Akira Teramoto

Keyword(s):

Blood Flow ◽

Subarachnoid Hemorrhage ◽

Flow Velocity ◽

Cerebral Vasospasm ◽

Transcranial Doppler ◽

Blood Flow Velocity ◽

Predictive Value ◽

Cerebral Arteries ◽

Absolute Flow ◽

Middle Cerebral Arteries

Abstract BACKGROUND: Transcranial Doppler (TCD) is widely accepted to monitor cerebral vasospasm after subarachnoid hemorrhage (SAH); however, its predictive value remains controversial. OBJECTIVE: To investigate the predictive reliability of an increase in the mean blood flow velocity (mBFV) ratio of the ipsilateral to contralateral middle cerebral arteries (I/C mBFV) compared with the conventional absolute flow velocity. METHODS: We retrospectively investigated the clinical and radiologic data of consecutive patients with SAH admitted from July 2003 to August 2009 who underwent TCD ultrasonography. The highest mBFV value in bilateral middle cerebral arteries was recorded, while delayed cerebral ischemia (DCI) was defined as neurological deficits or computed tomographic evidence of cerebral infarction caused by vasospasm. The ipsilateral side was defined as the side with higher mBFV value when evaluating the I/C mBFV. We thus elucidated the reliability of this rate in comparison with the conventional method for predicting DCI with receiver operating characteristic (ROC) analysis. RESULTS: One hundred and forty-two patients were retrospectively analyzed with specific data from 1262 TCD studies. The ROC curve showed that the overall predictive value for DCI had an area under the curve of 0.86 (95% confidence interval: 0.76-0.96) when the I/C mBFV was used vs 0.80 (0.71-0.88) when the absolute flow velocity was used. The threshold value that best discriminated between patients with and without DCI was I/C mBFV of 1.5. CONCLUSION: In patients with SAH, the I/C mBFV demonstrated a more significant correlation to vasospasm than the absolute mean flow velocity.

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Visually Evoked Changes of Blood Flow Velocity and Pulsatility Index in the Posterior Cerebral Arteries: A Transcranial Doppler Study

Zentralblatt für Neurochirurgie ◽

10.1055/s-2004-44887 ◽

2004 ◽

Vol 65 (01) ◽

pp. 13-17 ◽

Cited By ~ 1

Author(s):

R. Wiedensohler ◽

J. Kuchta ◽

A. Aschoff ◽

A. Harders ◽

N. Klug

Keyword(s):

Blood Flow ◽

Flow Velocity ◽

Transcranial Doppler ◽

Blood Flow Velocity ◽

Pulsatility Index ◽

Cerebral Arteries ◽

Doppler Study

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

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2021/9319413 ◽

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).

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