SU1732932A1 - Method of diagnosis of lesions of acoustic analyzer - Google Patents

Abstract

The invention relates to medicine, namely to otolaryngology. The method allows diagnostics of peripheral lesions of the auditory analyzer1, for which the threshold of audibility of the tonal stimulus of 1, 2 or 4 kHz with a duration of 5 ms is determined, the time of a simple motor response to stimulation with signals of 5 ms duration at above-threshold intensity 5 and 19 dB, the difference between the times of a simple motor reaction is calculated, the diagnostic criterion is determined using the formula given in the description, and at 3, the peripheral sound inimayuschego apparatus.

Description

WITH

WITH

The invention relates to medicine, namely to otolaryngology.

The aim of the invention is to improve the accuracy of detection of peripheral lesions.

The method is carried out as follows.

The study of the time of a simple motor reaction (WFD) is carried out at a frequency of 1.2 or 4 kg. After determining the value of the hearing threshold of a signal of a duration of 5 ms, the WFEL is measured at two intensity levels above the hearing threshold of a given duration of -5 and 10 dB.

The value of the WFD per stimulus with a duration of 5 ms at each intensity level is defined as the arithmetic average of 20

measurement of WFDD. After calculating the values, the difference in the WFDD is determined and the diagnostic criterion is calculated using the formula

VPRRb-VPRRU 77.5 - PS

where VPRDRb, VPRDRu - time of a simple motor reaction to a stimulus of duration 5 ms with a level of above-threshold intensity, respectively 5 and 10 dB, ms;

77.5 - constant, the value of which is equal to the coordinate on the abscissa axis of the intersection point of the abscissa axis with the upper limit of the 95% confidence interval, dB;

PS is the value of the threshold of hearing of a stimulus of a given frequency with a duration of 5 ms, dB,

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and at K 1.3 values, a peripheral lesion of the auditory analyzer is diagnosed.

Example. Patient K., 28 years old, bilateral sensorineural hearing loss.

The hearing threshold of a 4,000 Hz signal with a duration of 5 ms is 55 dB. The SPD for a stimulus of this duration, exceeding the threshold intensity level by 5 dB, is 238 ± 5.2 ms (20 measured values of the SPD are located in the range of 238–280 ms). The SPD for a stimulus of the same duration, exceeding the threshold intensity level by 10 dB, is 211 ± 4.7 ms (20 measured values of the SPD are located in the range of 188-241 ms). Diagnostic criterion, 3. Diagnosis: peripheral lesion of the sound-perceiving apparatus.

Claims (1)

The invention of a method for diagnosing a lesion of an auditory analyzer by determining the threshold of audibility of a tonal signal, conducting a stimulation and recording a response, characterized in 0 five 0 that, in order to increase the accuracy in detecting peripheral lesions, the stimulation is carried out with signals of 5 ms duration at levels of above-threshold intensity of 5 and 10 dB, the time of a simple motor reaction is recorded, the value of the diagnostic criterion K is calculated by the formula „ВПДР5 - ППДРю 77.5 - ПС where VPRDR, VPRDR - time of a simple motor reaction to a stimulus of duration 5 ms with a level of above-threshold intensity respectively 5 and 10 dB, ms; 77.5 is a constant whose value is equal to the coordinate along the abscissa of the intersection point of the abscissa with the upper limit of the 95% confidence interval, dB; PS is the threshold of hearing of a stimulus of this frequency with a duration of 5 ms, dB, and at values of K 1.3, peripheral lesion of the auditory analyzer is diagnosed.