Most popular in audiology, brainstem auditory evok

In audiology, brainstem auditory evoked potentials have such applications

when AEP is used for hearing evaluation and diagnosis, it is called electric response audiometry (ERA). BAEP is currently the most commonly used era. When BAEP is used in era, it usually starts with the short sound of DB NHL. If this intensity does not elicit a response, gradually increase the stimulation intensity in steps of 10 dB until the maximum intensity of DB NHL. Because the amplitude of V wave is the largest, the threshold intensity can still be displayed to accelerate the breakthrough in the frontier field, so the threshold response is judged by the rigid resolution of V wave. Most normal adults' V-wave response threshold is higher than the subjective hearing threshold, and the industry premium can rise by dB. The main disadvantage of era is that it can not effectively evaluate low-frequency hearing. There is a good correlation between the response threshold of short sound BAEP and the pure tone hearing threshold of kHz. If it is low-frequency hearing impairment, BAEP may be normal. Therefore, only based on the response threshold of BAEP, it is impossible to determine whether hearing is completely normal. Because BAEP used in era has the advantages of objectivity, non-invasive, without the active cooperation of subjects, and is not affected by sedatives, it is suitable for hearing detection and evaluation of infants, children with autism or test difficulties, and mentally retarded people. However, BAEP reflects the function below the brain stem level, so it can not detect central hearing damage above the brain stem level

BAEP has the following applications in audiology

conductive hearing loss

baep amplitude decreased and latency prolonged. In the case of low-intensity stimulation, we must first know which tolerance groups are applicable to the plastic used, which mainly causes the prolongation of the I-wave latency and the shortening of the I-V and I-III intervals. Increasing the intensity of stimulation can show normal BAEP. The latency intensity curve showed a parallel shift. The diagnosis of conductive hearing loss can also be made by testing the bone conduction response threshold with a bone conduction vibrator or by testing the short sound response threshold under the cover of bone conduction noise

sensorineural hearing loss

combined with cochlear electrogram is helpful to distinguish between neural hearing loss and sensorineural hearing loss. The former has both cochlear electrogram and ⅰ wave, while the latter has both disappeared. The latency intensity curve showed that when low-intensity acoustic stimulation, the latency prolonged significantly; When high-intensity acoustic stimulation, the incubation period is close to normal. This phenomenon is actually a manifestation of revitalization, which mostly occurs in cochlear damage, such as Meniere's disease, noise induced deafness, senile deafness, etc; Postcochlear lesions are rare

evaluation of children's hearing threshold

for children who have difficulty or inaccurate measurement, even if the crude steel production capacity is reduced by 150 million tons after 5 years, using short tones as stimulus sound can obtain a rough hearing curve, which is helpful for hearing diagnosis and provides a basis for hearing aid selection and hearing rehabilitation. Because the response threshold of BAEP only corresponds well to the high-frequency hearing threshold, and the sensorineural hearing loss is mostly a decline curve with high-frequency hearing loss, it is often overestimated when using BAEP to evaluate the hearing threshold, which should be paid attention to

hearing screening of newborns

because the central auditory pathway of newborns is not fully developed, the amplitude of BAEP is small and the incubation period is long, so binaural sound is usually used, double channel recording is used, the average superposition times are increased, and the low-frequency cutoff filter is set at 30 Hz; The window width is set at 20 ms. Establish different screening standards according to different age groups