Abstract
Transcranial Doppler ultrasonography was used to measure the linear blood velocity (LBV) in the middle cerebral artery (MCA) of the right and left hemispheres in right-handers and left-handers who were breathing a gas mixture with 10% oxygen through a mask at normal barometric pressure. No interhemispheric differences were found in left-handers before hypoxia. The maximum systolic velocity was higher in the MCA of the left hemisphere in right-handers. Left-handers had a higher LBV in the right hemisphere than did right-handers. LBV in the MCA of both hemispheres increased in both left-handers and right-handers as a result of hypoxia. Aggravation of hypoxia caused a decrease in LBV in the left hemisphere in right-handers.
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