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• W1995694703 abstract "Background and Purpose —The vasomotor response can be tested by means of transcranial Doppler sonography. If a constant vessel diameter is assumed, the flow velocity changes will reflect blood flow volume changes. This hypothesis is difficult to verify. Simultaneous assessment of intracranial flow velocity and extracranial flow volume changes may solve this problem. Methods —We tested vasomotor response in 32 volunteers (age, 42±18 years) with 5% CO 2 . Acetazolamide (1 g) was tested in 15 volunteers (age, 28±8 years). To evaluate drug-dependent flow changes in the external carotid artery territory, acetazolamide was administered in 7 patients with unilateral occlusion of the internal carotid artery without evidence of collateralization through the ophthalmic artery (age, 67±12 years). Simultaneous recording included measurements of flow volume in the common carotid arteries (M-mode color duplex system) and flow velocity in the middle cerebral arteries. Results —With CO 2 and acetazolamide, intracranial flow velocity increased by 31% and 39%, respectively, with a simultaneous increase of common carotid artery flow volume of 47% and 50%, respectively. No change in extracranial flow volume was observed in patients with an occluded internal carotid artery. Conclusions —These data show not only the expected increase of flow velocity in the middle cerebral artery but also suggest an increase in cross-sectional vessel diameter of 6% and 4% with CO 2 and acetazolamide, respectively. It remains unresolved whether this observation is due to a direct effect of the drug on the vessel walls or is simply pressure dependent." @default.
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• W1995694703 date "1999-01-01" @default.
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• W1995694703 title "Influence of Acetazolamide and CO ₂ on Extracranial Flow Volume and Intracranial Blood Flow Velocity" @default.
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• W1995694703 doi "https://doi.org/10.1161/01.str.30.1.76" @default.
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