[Diagnostic implications of examination of the middle ear resonance frequency].

Resonance frequency of the middle ear was examined in 24 persons with normal hearing, 10 patients with otosclerosis and 4 patients subjected to stapedioplasty. It is shown that shift of the resonance frequency is important for differential diagnosis. In particular, in otosclerosis resonance frequency shifts to higher values, while in mass increases (rupture of acoustic bones chain) there is a shift to lower frequencies.