Cortical blood flow and epidural intracranial pressure have been measured in the two supratentorial compartments of the intracranial space in experimental baboons during the acute expansion of a parieto-occipital epidural balloon. Differential pressures between the two halves of the supratentorial space have been found, and these have been associated with evidence that flow has fallen more quickly in the hemisphere most compressed. The evidence points to a more rapid exhaustion of the autoregulatory capacity in the hemisphere subjected to greater compression, a fall in perfusion pressure to below critical autoregulatory levels occurring slightly before that in the opposite hemisphere, and the establishment of a differential flow pattern for a short time during a critical phase of compression. The displacements induced by inflation of the parieto-occipital balloon have been described.
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↵2 Address for reprints: Mr. Lindsay Symon, FRCS, Department of Neurosurgical Studies, The National Hospital, Queen Square, London WC1N 3BG, England.
↵3 Dr. Pasztor was the recipient of a research fellowship from the Wellcome Foundation. Present address: The Institute of Neurosurgery, 1145 Budapest, Amerikai -u57, Hungary.
↵1 The study was supported by the Medical Research Council and by the Wellcome Foundation.