From Big Medical Encyclopedia

BING TEST (A. Bing, is mute. the otorhinolaryngologist, 1844 — 1922) — a method of a research of hearing for the purpose of differential diagnosis between dysfunction of the sound carrying out and sound perceiving systems.

B. is offered by Bing in 1910 items carry out by method tone audiometriya (see). Compare the level of hearing during the carrying out sounds through a bone to the closed and open acoustical pass. By bp it is based that at a normality of a middle ear bone conductivity of a sound from the tuning fork placed on a mastoid is more long at the closed outside acoustical opening, than at open.

A technique of carrying out Bing of test

the Sounding tuning fork is established on a mastoid of investigated. At normal hearing or at defeat of the sound perceiving device (e.g., at cochlear neuritis) after investigated ceases to hear a tuning fork, he begins to perceive its sounding again if he closes to himself outside acoustical pass (positive B. of the item); at dysfunction of the sound carrying out system of lengthening of time of sounding of a tuning fork at the closed outside acoustical pass does not occur (negative B. of the item). For the quantitative characteristic of B. of the item at a research measure by tuning forks duration of the closing of an ear of perception of sounding of a tuning fork which appeared later in seconds. The more this time, the is less than bases to assume dysfunction of the sound carrying out system.

During the closing of an ear at some patients the feeling of noise in an ear appears or amplifies. The patient can not always differentiate clearly this feeling from feeling of perception of a sound of a tuning fork, especially low. In order that to avoid it, Ya. S. Temkin suggested to alter B. of the item. In the beginning at the patient investigate bone conductivity, having established a leg of the sounding tuning fork on area of a mastoid. When the patient ceases to perceive a sound, the doctor establishes a leg of a tuning fork to himself on area of a mastoid. At the same time two options are possible: 1) the doctor perceives a sound, therefore, at the patient carrying out a sound through a bone is lowered that demonstrates dysfunction of the sound perceiving system (B. of the item positive); 2) the doctor does not perceive a sound; in this case it a finger closes the acoustical pass. If at the patient function of the sound carrying out device is broken, the doctor will not perceive a sound of a tuning fork at the closed ear (B. of the item negative). This fact, as at the doctor is explained by that, and the patient had an obstacle for carrying out sounds. At the first it is created artificially, at the second — is a consequence of a disease. Such technique of performance of B. of the item is possible only at normal hearing at the doctor.

Items apply tuning forks to B. from C 128 to C 1024 . The tuning fork of C is more suitable for identification of initial stages of disturbance of functions of the sound carrying out device 128 , since his perception at bone conductivity is extended already when perception of higher tuning forks is not changed yet.

Bibliography: At N d r and V. F. c, Temkin Ya. S. and H e y m and L. V N. Guide to a clinical audiology, page 109, M., 1962; Bing A. Ziir Theorie der hor-bessemden Wirkung des kiinstlichen Trom-melfells, Mschr. Ohrenheilk., S. 1021, 1910.

H. A. Preobrazhensky.