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Pathogenesis of Hearing Loss in Head InjuryStudies in Man and Experimental Animals
Kazumi Makishima, MD;
James B. Snow, Jr., MD
Arch Otolaryngol. 1975;101(7):426-432.
Abstract
This study reports on the histopathologic findings in the temporal bones and brain of a patient who died of head injury.
A common type of head injury in man was simulated in guinea pigs by shaking them. A hearing loss was demonstrated with Preyer reflex audiometry although the cochlear potential thresholds remained normal. Only minor pathologic changes were found in the membranous labyrinths. Laceration and hemorrhage in and around the cerebrum, rhombencephalon, and eighth nerves were noted in most of the experimental animals.
Auditory manifestations following head injury may very frequently be due to damage to the central auditory pathways rather than to the end organ.
Author Affiliations
From the Department of Otorhinolaryngology and Human Communication, University of Pennsylvania School of Medicine, Philadelphia.
Footnotes
Accepted for publication Feb 25, 1975.
Read before the Forum on Fundamental Surgical Problems of the 60th Annual Clinical Congress of the American College of Surgeons, Miami, Fla, Oct 22, 1974.
Reprint requests to the Department of Otorhinolaryngology and Human Communication, University of Pennsylvania School of Medicine, 3400 Spruce St, Philadelphia, PA 19104 (Dr. Makishima).
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