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Journal of Ultrasound in Medicine, Vol 9, Issue 7 403-409, Copyright © 1990 by American Institute of Ultrasound in Medicine
Side-to-side differences and day-to-day variations of transcranial Doppler parameters in normal subjects
W. Sorteberg, I. A. Langmoen, K. F. Lindegaard and H. Nornes
Department of Neurosurgery, Rikshospitalet, University of Oslo, Norway.
We investigated 35 normal adults to assess variations in cerebral artery
blood velocities, hemispheric blood velocity ratios, and pulsatility
indices, both with regard to changes between the sides and between days. We
found no significant variations between sides or days. Changes from one day
to the next exceeding 20% in blood velocity in the middle cerebral artery
(VMCA), the anterior cerebral artery (VACA), the distal extracranial
internal carotid artery (VICA), and in the hemispheric VMCA/VICA,
VACA/VICA, or VACA/VMCA ratios, may be considered significant at the 95%
level.
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