Two-component versus admittance tympanometry.
The probe tone frequency of electro-acoustic bridges has a direct effect on the shape of the tympanograms obtained. At higher frequencies (800 Hz) typical patterns are generated for eardrum abnormalities and ossicular discontinuities. The 625- and 660-Hz frequencies sometimes prove to be not quite high enough to obtain the expected 'W' or undulating admittance tympanograms. Our investigation proves that much more certainty is given even at 660-Hz probe tone when components B and G are both recorded. The same information for ossicular disruption is found in an admittance (Y) together with a new kind of tympanogram, namely the phase tympanogram.
D001299:Audiometry / Q000295:instrumentation; D004427:Ear Diseases / Q000175:diagnosis; D004429:Ear Ossicles / Q000502:physiology / Q000503:physiopathology; D004432:Ear, Middle / Q000502:physiology* / Q000503:physiopathology; D006801:Humans; D014432:Tympanic Membrane / Q000502:physiology* / Q000503:physiopathology