Changes of epidural pressures after experimental occlusion of one middle cerebral artery in cats.

Journal of the Neurological Sciences
T Hayakawa, A G Waltz

Abstract

Epidural pressures (EDP) were measured in 29 cats. Twenty cats had the left middle cerebral artery (MCA) occluded; pentobarbital was used for anesthesia for 10 of these, and halothane was used for the other 10. Two cats had sham operations: the MCA was manipulated but not occluded. Seven cats were used for testing the reliability of the EDP devices. EDP was measured successfully and was directly related to the swelling of the brain and to the size of the cerebral infarct resulting from MCA occlusion. Side-to-side pressure gradients were demonstrated in 7 cats with marked increases of EDP after occlusion; in these cats, EDP may have reflected the pressure of compressed cerebral tissue rather than the pressure of cerebrospinal fluid. Cats anesthetized with pentobarbital had greater increases of EDP and died before the end of the period of observation more frequently than cats anesthetized with halothane, probably because of respiratory depression and slower recovery with pentobarbital. Measurements of EDP may be useful for studies of the treatment of cerebral edema in experimental models of acute cerebral ischemia.

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