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June 1972

Tympanic Membrane Perforation: Effect on Audiogram

Author Affiliations

Fort Worth, Tex
From Harris Hospital, Fort Worth Medical Center, Fort Worth, Tex.

Arch Otolaryngol. 1972;95(6):506-510. doi:10.1001/archotol.1972.00770080796003

The effects of both size and location of tympanic membrane perforations on hearing loss were studied. Using only those cases in which the air-bone gap was closed by myringoplasty, the variable of ossicular chain defects was controlled. Definite trends appeared in averages of the groups which tend to confirm two generalizations: (1) Effectiveness of the tympanic membrane decreases with loss of total area and (2) loss of membrane contact with the manubrium of the malleus affects its abiliy to move. A useful formula for predicting hearing loss on the basis of size and location of perforation is impossible because of wide variations of individual cases within any particular group.

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