✓ High intracranial hypertension was induced in dogs by intracarotid injections of oil. Cerebrospinal fluid pressures continued to rise as Cushing pressor responses were evoked, but were not exceeded by the blood pressure. Transmission of blood pressure through a dilated vascular bed has been suggested as the mechanism. There was no correlation between levels of cerebral edema and the rise in intracranial pressure. This increase in pressure due to vascular blockade has been differentiated from that caused by subarachnoid blockade.