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  • Title: Hypocapnia and intracranial volume-pressure relationship. A clinical and experimental study.
    Author: Rowed DW, Leech PJ, Reilly PL, Miller JD.
    Journal: Arch Neurol; 1975 Jun; 32(6):369-73. PubMed ID: 1131071.
    Abstract:
    The effect of induced hypocapnia was observed, during intraventricular pressure monitoring, in five patients with chronically increased intracranial pressure (ICP) and in five baboons with acutely raised ICP. The volume-pressure response (VPR) was used as a measure of intracranial elastance (inverse compliance), an index of residual compensatory capacity. The VPR is the acute increase in mean ICP that occurs in response to a constant volume increment to ventricular cerebrospinal fluid. In the patients, hypocapnia produced a decrease in the VPR that was proportional to the decrease in ICP; in the baboons, ICP was substantially decreased with minimal change in the VPR. Both observations indicate that hypocapnia, though it decreases ICP, does not selectively decrease intracranial elastance. This may be a limiting factor in the use of hypocapnia in the management of raised ICP.
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