Auditory brain stem response results from 255 patients with suspected retrocochlear involvement

Area of Science:

• Audiology
• Neuroscience
• Otolaryngology

Background:

• Retrocochlear pathologies can present with subtle auditory symptoms.
• Auditory Brainstem Response (ABR) is a key diagnostic tool for evaluating the auditory pathway beyond the cochlea.

Purpose of the Study:

• To assess the diagnostic utility of ABR in patients with suspected retrocochlear involvement.
• To differentiate ABR findings in tumor versus non-tumor cases.

Main Methods:

• Conducted ABR evaluations on 255 patients with suspected retrocochlear pathology.
• Correlated ABR results with surgical confirmation of tumors and other medical diagnoses.

Main Results:

• Surgically confirmed tumors were identified in 10% of patients, with 96% showing abnormal ABRs.
• 25% of patients with non-tumor diagnoses also exhibited ABR abnormalities.
• Common non-tumor ABR abnormalities included interaural latency differences, poor waveform resolution, and delayed wave V latency, potentially influenced by peripheral hearing loss.

Conclusions:

• ABR is highly sensitive for detecting tumors in suspected retrocochlear cases.
• ABR abnormalities are not exclusive to tumors and can be present in other conditions, notably peripheral hearing loss.
• Careful interpretation of ABR findings, considering peripheral hearing status, is crucial for accurate diagnosis.