Transcranial doppler measurements of the middle cerebral artery: effect of hematocrit

We evaluated the effects of hematocrit on blood velocity in the middle cerebral artery measured by transcranial Doppler ultrasonography in 45 patients. Hematocrits ranged from 16% to 46%, and systolic blood velocities ranged from 70 to 190 (mean 40 to 140) cm/sec. Decreases in hematocrit correlated...

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Veröffentlicht in:	Stroke (1970) 1988-12, Vol.19 (12), p.1466-1469
Hauptverfasser:	BRASS, L. M, PAVLAKIS, S. G, DEVIVO, D, PIOMELLI, S, MOHR, J. P
Format:	Artikel
Sprache:	eng
Schlagworte:	Adolescent Adult Aged Biological and medical sciences Blood Flow Velocity Cerebral Arteries - physiology Child Child, Preschool Female Hematocrit Humans Investigative techniques, diagnostic techniques (general aspects) Male Medical sciences Middle Aged Nervous system Ultrasonic investigative techniques Ultrasonography
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Zusammenfassung:	We evaluated the effects of hematocrit on blood velocity in the middle cerebral artery measured by transcranial Doppler ultrasonography in 45 patients. Hematocrits ranged from 16% to 46%, and systolic blood velocities ranged from 70 to 190 (mean 40 to 140) cm/sec. Decreases in hematocrit correlated with increases in blood velocity in the middle cerebral artery. These results suggest that transcranial Doppler measurements made in the presence of anemia may need correction.
ISSN:	0039-2499 1524-4628
DOI:	10.1161/01.str.19.12.1466