Change of Cerebral Blood Flow Velocity in Hyperventilation Observed by Simultaneous and Continuous Measuring of Healthy Persons' Internal Carotid and Vertebral Arteries by Using Fixed Ultrasonic Doppler Probes

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We recorded the change of blood flow velocity before, during and after hyperventilation (HV) in bilateral Internal Carotid Arteries (ICA) and Vertebral Arteries (VA) simultaneously and continuously of 4 healthy males.<BR>The MULTI-DOPPLER-SYSTEM (HAYASHI ELECTRIC, Inc. Kawasaki, JAPAN) and four ultrasonic probes fixed by a cervical brace (KAWAMURA ARTIFICIAL LIMB, Inc.Osaka, JAPAN) were used to obtain data.<BR>We calculated Averaged Maximum Velocity (AMV) for every heart beat as the Index of blood flow and visualized them in 4 subjects.<BR>AMV repeatedly increased and decreased every several seconds. HV induced a statistically significant AMY decrease. The AMY interrelations between any two vessels in each subject were all statistically significant. The coefficients of correlation were largest during HV and smallest before HV.