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IN THE fitting of a hearing aid the conductive and the perceptive type of deafness offer less difficulty than the mixed type. To simplify matters, some audiologists have subdivided the patients with mixed deafness into conductive-perceptive and perceptive-conductive groups.
Most commonly in cases of mixed deafness the otoscopic picture is that of chronic adhesive otitis media. There is frequently a large perforation in the drum membrane with absence of the greater part of the malleus and incus. The inner wall of the middle ear is excessively thickened, and bands of adhesions run from one intratympanic structure to another. The accompanying illustration is the typical audiogram of mixed deafness. There is a profound hearing loss for the high tones, but bone conduction is better than air conduction for the lower frequencies.
From a study of 12 patients with mixed deafness, in regard to the selection of a hearing aid, several generalities
SALTZMAN M, ERSNER MS. THE HEARING AID IN MIXED DEAFNESS. Arch Otolaryngol. 1949;50(3):249–250. doi:10.1001/archotol.1949.00700010259002
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