Abstract
280 tympanograms were recorded in sound-conductive hearing loss to assess their value in the differential diagnosis of otosclerosis and adhesive processes. A normal tympanogram can be recorded in otosclerosis. In 48% of adhesive processes a more or less normal impedance pattern can be demonstrated. Therefore, in evaluating tympanograms in adhesive processes, one must take into consideration the microscopic picture of the eardrum and its mobility.