SUBDURAL HEMATOMA

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Abstract
During the past years a large number of persons with recent and old head injuries have been referred to the electroencephalographic department for assistance in the differential diagnosis of subdural hematoma from other forms of intracranial lesions. At first the criterion of Jasper,1namely, decreased amplitude of electric activity over the region of hemorrhage, was relied on. However, it was soon recognized that verified cases of subdural hemorrhage often gave rise to generalized high voltage, slow waves with a focus of maximum abnormality over the region of the extravasation of blood. Moreover, occasional records were obtained in which no definite focal or general abnormality was demonstrated. It became imperative, therefore, to attempt to establish the basis for these observed electroencephalographic findings in man. For this purpose, animal experiments were designed in which the controlled introduction of the animal's own blood into the intracranial cavity simulated the condition of spontaneous

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