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. © 1988 American Heart Association, Inc.
Brass, L. M., Pavlakis, S. G., Devivo, D., Piomelli, S., & Mohr, J. P. (1988). Original contributions transcranial doppler measurements of the middle cerebral artery: Effect of hematocrit. Stroke, 19(12), 1466–1469. https://doi.org/10.1161/01.STR.19.12.1466