FIELD: medicine.
SUBSTANCE: invention relates to medicine, namely to otolaryngology, and can be used in determining the form of hearing loss in patients with bilateral hearing changes. For this purpose, determine the bone (BC) and air conduction (AC), as well as bone-air interval (BAI) by audiological examination of each ear. In addition, a threshold of audibility of an ultrasound (US) signal common to both ears is determined, for which an ultrasonic emitter is placed on the patient's forehead along the sagittal line of the head at the border of hair growth with preliminary application of vaseline oil on the skin surface. US signal is applied at a frequency of 100 kHz and the threshold of hearing of ultrasonic signals and lateralization of the US signal at the threshold of hearing of US signals are determined, and at a louder sound – by 5–7 dB more than the threshold of hearing of US (suprathreshold lateralization), better hearing ear is determined. Next, masking a better hearing ear with narrow-band noise +40 dB is performed over air conduction (AC) of better hearing ear, and the thresholds of AC, bone conduction (BC) and BAI is re-determined for a worse hearing ear. With a combination of lateralization of audible sounds and US in the direction of a worse hearing ear, there is no difference in BC thresholds on a worse hearing ear before and after masking a better hearing ear, maintaining the same BAI on a worse hearing ear before and after masking a better hearing ear diagnose conductive hearing loss on a worse hearing ear. With a combination of lateralization of audible sounds in the direction of a worse hearing ear, the lack of lateralization of the threshold and above-threshold US or the presence of lateralization of US towards a better hearing ear, increased BC thresholds of worse hearing ear and decreased BAI thereof after masking a better hearing ear reveal the presence of a hidden cochlear component in the worse hearing ear and, accordingly, diagnose mixed hearing loss on it.
EFFECT: method provides the most accurate determination of the form of hearing loss in patients with a bilateral hearing change due to a specific hearing test complex, which allows confirming or disproving the presence of a latent cochlear component.
1 cl, 3 ex
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