Auditory brain stem response (ABR) evaluations were conducted on 255 patients with suspected retrocochlear involvement. Twenty-six patients (10%) had surgically confirmed tumors, and ABRs were abnormal in 25 (96%) of these cases. The remaining 229 patients had nontumor medical diagnoses, but 25% of these were found to have abnormalities in ABR recordings. The most common ABR abnormality in the nontumor patients was large wave V interaural latency difference, followed by no response or poor waveform resolution and delayed absolute wave V latency. Peripheral hearing loss, including decreased sensitivity at 2000 and 4000 Hz, appears to have influenced waveform morphology and component latency.
No takes yet. Share an insight, caveat, or question.
Bauch et al. (1982) studied this question.