Neuro-otologic evaluation of the patient with acute, severe head injuries: correlations among physical findings, auditory evoked responses, and computerized tomography.
Long-term clinical neurologic and otologic sequelae of traumatic head injury are well recognized. In this article, we describe the relationship among neurophysiologic, neuro-otologic, and neuroradiologic findings in a series of fifty patients with acute, severe head injury. Seventy percent of the patients had one or more otologic abnormalities, of which hemotympanum was most common. Outcome of computerized tomography (CT), auditory brainstem response (ABR), and otologic examination findings were not mutually dependent. For example, otologic disease was found in 50% of the patients with normal ABR. All but one patient in the series showed brain damage by CT; yet only 14% of the series had evidence of temporal bone fracture and, unexpectedly, one third of this group yielded normal otologic findings and a normal ABR. We conclude that combined application of otologic examination, CT scanning, and auditory evoked response assessment provides complementary information on structural and functional neuro-otologic status in persons with acute, severe head injury.