Tympanometry Before and After Tubal Inflation

Abstract

Stapedius reflex, static compliance, type of mpanogram and shift of pressure peak were exa ined before and after tubal inflation for a total of 1 ears of 97 adults aged from 21 to 87 years for jective evaluation of the effect of tubal inflation nd for predicting presence or absence of middle ear fusion in the cases in which air-fluid level was not etected otoscopically.
Concerning the judgement of the effect of tubal flation, change of type of tympanogram was found seful for the cases with type B and C before infla on, and pressure peak shift for those with type A efore inflation. The efficacy was 80.0 and 100% espectively for the cases with type B and C before flation which altered to type A after inflation. n the cases with type A before inflation the efficacy f tubal inflation varied with the extent of pressure eak shift, and it was proved that the tubal inflation was always useful when the pressure peak shifted toward positive pressure exceeded 35mmH₂O.
The change of tympanogram type before and after inflation could predict the presence of effusion in the middle ear, and the cases with type B before and after inflation were suspected of the presence of effusion, but tympanostomy was not necessary in the cases with type A after inflation unless air-fluid level was observed.