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October 1966

Head In jury With Suspected Subdural Hematoma: Effect on EEG

Author Affiliations

From the Section of Neurologic Surgery (Dr. MacCarty) and Section of Physiology and Clinical Electroencephalography (Dr. Klass), Mayo Clinic and Mayo Foundation; Department of Neurology (Dr. Gutierrez-Luque), Mayo Graduate School of Medicine, University of Minnesota, Rochester.

Arch Neurol. 1966;15(4):437-443. doi:10.1001/archneur.1966.00470160103013

MORE than a century ago, Virchow1 pointed out the difficult problems often encountered when attempting to diagnose subdural hemorrhage. Unfortunately, not all of the problems have been solved.

The electroencephalogram now has become a valuable and practical supplement to the clinical neurologic evaluation for diagnosis of intracranial lesions, and it has been widely used for assessment of cerebral function after head injury. In 1940 Jasper and co-workers2 found low-amplitude activity in EEGs recorded from scalp areas overlying subdural hematomas; in the same year Walter3 reported the occurrence of abnormal slow (delta) activity overlying epidural hematomas. Since that time, most investigators have found a high proportion of abnormal EEGs associated with either subdural or epidural hematomas,4,5 but there has been disagreement regarding the relative importance of the different types of EEG abnormality for diagnosis and localization of these lesions. Some authors6-12 have emphasized the localizing

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