ABR (auditory brainstem response) is mainly used for:
To
It can be combined with other audiology tests to identify the nature of hearing loss; it is most commonly used to check for post-cochlear lesions: such as prolonged latency of each wave, prolonged wave interval, significant difference in latency or wave interval between ears, and waveform differentiation The difference indicates the possibility of post-cochlear lesions.
The main differential diagnosis of ABR:
①Transmissive deafness: The V-wave response threshold is increased but the threshold latency is in the normal range. The acoustic latency-intensity function curve shifts to the right.
② Meniere's disease: Deafness with reinstatement is manifested as an increase in the V-wave threshold, but when the acoustic stimulation is within 20dB above the threshold, the incubation period is shortened and reaches a normal value;
③Acoustic neuroma: I-V wave interval is prolonged or V wave disappears, but if the patient's I wave is not clear, the false positive rate is very high. At this time, the comprehensive analysis of cochlear electrogram should be combined to improve the diagnostic accuracy. The difference between the I-V interval between the two ears is greater than 0.4ms, or the I-V interval on one side is greater than 4.6ms (age and gender factors should be considered), it indicates that there is a posterior cochlear disease;
④Diagnosis of brainstem lesions: Multiple sclerosis, brainstem vascular lesions and brainstem tumors can also cause the amplitude of the evoked potential to decrease, the incubation period to prolong, or the waveform to disappear. It should be identified based on the medical history and related examinations. Functional deafness and pseudo-deafness: The hearing threshold can be assessed objectively, but it should be noted that short-latency potentials and short-sound examinations can easily underestimate residual hearing in the low-frequency domain.
BAEP (auditory evoked potential) is mainly used for:
Audiometry in otology (pediatric hearing screening, functional and organic deafness), auditory pathway nerves and brainstem functional or organic diseases (peripheral acoustic neuropathy, acoustic neuroma, brainstem intramedullary tumor, multiple sclerosis, Brainstem vascular disease, genetic metabolic and degenerative diseases, medullary cavitation), chronic viral infection and meningitis, encephalitis, epilepsy, tinnitus, sequelae of brain oscillation, hysteria and deafness, coma and brain death, hepatic encephalopathy, chronic Renal failure, diabetes, alcohol and smokers, and anesthesia.
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