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- W2028758897 abstract "Part I of these studies (Artru, 1987) examined how cerebral blood volume (CBV), CSF volume, and brain tissue water and electrolytes determined CSF pressure during 4 h of hypocapnia in sedated dogs. The three groups reported were: hypocapnia (P a CO 2 20 mm Hg) with no intracranial mass (group 1), intracranial mass (epidural balloon, CSF pressure 35 cm H 2 O) but no hypocapnia (group 2), and intracranial mass with hypocapnia used to lower CSF pressure (group 3). It was found that in dogs with an intracranial mass (group 3) the CSF pressure-lowering effect of hypocapnia was sustained for 4 h due to improved reabsorption of CSF, decrease of CSF volume to offset reexpansion of CBV and no increase in the sum of CSF volume and CBV. The present Part II studies (groups 4–8) examine the effects of anesthetics on CSF pressure during conditions like those used for group 3, namely, intracranial mass present and hypocapnia used to lower CSF pressure. When halothane or enflurane were used for anesthesia, the CSF pressure-lowering effect of hypocapnia was not sustained. CSF pressure increased from 17.3 ± 4.7 and 19.0 ± 4.1 cm H 2 O, respectively (mean ± SD), at 10 min to 50.3 ± 12.8 and 43.2 ± 12.8 cm H 2 O, respectively at 4 h. Increase of CSF pressure was associated with increased resistance to reabsorption of CSF (R a ) and increase in the sum of CSF volume and CBV. With halothane the intracranial volume increase was comprised chiefly of cerebral blood and with enflurane the intracranial volume increase was comprised chiefly of CSE When isoflurane, fentanyl, or thiopental were used for anesthesia, the CSF pressure-lowering effect of hypocapnia was sustained. Ra did not increase and the sum of CBV and CSF volume remained reduced." @default.
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- W2028758897 date "1988-10-01" @default.
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- W2028758897 title "Reduction of Cerebrospinal Fluid Pressure by Hypocapnia: Changes in Cerebral Blood Volume, Cerebrospinal Fluid Volume and Brain Tissue Water and Electrolytes. II. Effects of Anesthetics" @default.
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- W2028758897 doi "https://doi.org/10.1038/jcbfm.1988.123" @default.
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