During the past year we have made a clinical study of severe deafness in adults in an attempt to add a few definite facts to our meager store of knowledge concerning progressive deafness. How important is chronic sinus infection or nasal obstruction in the etiology of progressive deafness? How many adults with a severe defect in hearing suffer from primary nerve deafness and how large a proportion from obstruction to sound conduction? Is a combination of factors responsible for severe deafness in a considerable number of cases? How large a proportion of severely deafened adults suffer from otosclerosis? Finally, how many severely deafened adults have lost their hearing as the result of middle ear disease which began in childhood and which might have been prevented? These and other causes for severe deafness have long been recognized, but accurate statistics on the relative importance and frequency of each of these factors
SHAMBAUGH GE, WALLNER LJ, GREENE LD, SHAMBAUGH GE. SEVERE DEAFNESS IN ADULTS: A CLINICAL STUDY. Arch Otolaryngol. 1933;18(4):430–448. doi:10.1001/archotol.1933.03580060462003
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