Abstract
Time requirements for achieving tonal sensation have been shown to be affected by the state of the blood supply to the brain stem. Of 57 patients selected for vertebral artery surgery, a fortuitous instance of a subclavian steal produced by automobile accident in a normal 23-year-old man was closely studied audiologically immediately after the trauma. The test for tonal sensation was grossly abnormal; all other audiological tests were normal. Following surgical repair of the steal, time scores returned to near normal; cortical-evoked potentials became more complex. Other audiologic test results remained unchanged. Arteriograms are presented. The presentation illustrates pre- and postoperative test results in 57 cases selected for vertebral artery surgery and current work utilizing specific brain-stem destruction in rhesus monkeys. [Supported in part by a United Cerebral Palsy grant and by the National Institutes of Health, U. S. Public Health Service, Department of Health, Education, and Welfare.]
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