Calculation of hearing results after tympanoplasty

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Abstract
There is no universally accepted method for calculating hearing results after chronic ear surgery [in humans]. The methods most frequently used were applied to a material of 105 tympanoplasties and compared to each other. In addition, a comparison between pre- and postoperative bone conduction (BC) thresholds for calculating postoperative air-bone gaps was performed using multiple regression analysis. Apparently, BC thresholds will improve with surgery in successful cases, and the postoperative BC threshold is a closer approximation of the cochlear function than the preoperative one and should be used for gap calculations. Until the masking procedures in audiometry are standardized, hearing gain may be regarded as the most satisfactory alternative for describing hearing results as it is based on the air conduction thresholds only. This method requires a careful description of preoperative air and bone conduction thresholds.

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