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Effect of Rapid Mannitol Infusion on Middle Cerebral Artery Blood Flow Velocity and Pulsatility Index : A Transcranial Doppler Ultrasonography Study in Monkeys Katsuhiko Harada 1 , Takashi Hayashi 1 , Shigetaka Anegawa 1 , Ryuichiroh Torigoe 1 , Nobuaki Nishio 2 , Takumi Moriyama 3 , Kenji Maeda 3 , Keisuke Toda 3 1Department of Neurosurgery, Institute of Neurosciences, St Mary's Hospital 2Department of Neurosurgery, Syakaihoken Tagawa Hospital 3Department of Neurosurgery, Fuchu Keijinkai General Hospital Keyword: Mannitol , Transcranial Doppler , pulsatility index , vasoconstriction , autoregulation pp.649-654
Published Date 1993/7/1
DOI https://doi.org/10.11477/mf.1406900508

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  • Abstract
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Hemodynamic changes immediately after the administration of mannitol were investigated in monkeys (Macaca Fuscata) using transcranial Doppler ultrasound (TC2-64) and were compared with those after CO2 loading. The CO2 loading group was hyperventilated to an end-tidal PCO2 of 36.5±2.21 and hypoventilated to an end-tidal PCO2 of 46.3 ±2.69. Mean flow velocity in the middle cerebralartery (MCA-FV), Pulsatility index (PI) and blood flow in the internal carotid artery (IC-BF) studies were performed twice before and after hypercap-nea. In the Mannitol group, Mannitol (2 g/kg) was infused at a rate 20 to 30 ml/min. MCA-FV, PI, IC -BF and intracranial pressure (ICP) studies were performed twice before administration and 10 min-utes after administration of Mannitol. In the Man-nitol group (n=8), MCA-FV and IC-BF and ICP increased significantly after administration of Man-nitol (p<0.005, p<0.005, p<0.025) , but there was no significant difference in the PI. In the CO2 loading group (n=15) , MCA-FV and IC-BF increasedsignificantly (both p<0.005) and PI decreased significantly (p<0.005). These results indicated that, in the presence of normal autoregulation without intracranial hypertension, there was no change in the resistance of the peripheral cerebral vessels, while a decrease in viscosity after adminis-tration of Mannitol caused an increase in cerebral blood flow. Hence, acording to Poiseuille's law, peripheral vasoconstriction occurred in the early period after administration of Mannitol. This change was considered to be due to autoregulation of the cerebral vessels.


Copyright © 1993, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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