OTOACOUSTIC EMISSION DISTORTION PRODUCT IN VIOLATION SOUND CONDUCTION AND SOUND PERCEPTION. DIAGNOSIC SUBSTANTIATION OF THE EFFECT
In this article, the possibility of using the method of otoacoustic emission at the frequency of the distortion product is estimated based on the principle of changes in the reactance of the elasticity and / or viscosity of the sound-conducting media of the middle and inner ear. In the first part of the work, a biophysical model of the reactivity of the stiffness and / or viscosity of the middle and inner ear systems is theoretically substantiated. The second part is based on the presented theoretical model of mechanoacoustic transformations and confirms experimentally the influence of changes in sound conditions in the middle and / or inner ear system on the registration of the distortion product. The presented work allows to understand the nature of the distortion product as a complex combined mechanoacoustic reaction of the sound-conducting systems of the middle and inner ear and the active response (motility) of the outer hair cells. Evaluation of the nature of the product distortion of otoacoustic emission and change in the parameters of its registration makes it possible to develop diagnostic criteria for the pathology of sound conduction and sound perception. For this purpose, a comparative classification of DP-grams has been developed. The presented classification reflects well the various real clinical conditions. It is convenient to use and can facilitate the work of a doctor-otorhinolaryngologist, narrowing the range of diagnostic search.