Subjective and Electrophysiologic Tests in Brain-Stem Lesions

Auditory function in adrenomyeloneuropathy

“…The contralateral acoustic reflex may reflect brainstem pathology when ipsilateral reflexes are intact as was the case frequently in the present investigation. Contralateral acoustic reflex abnormalities, which were present in 50% of the AMN patients in this study, have also been reported in patients with a variety of neurological conditions including patients with multiple sclerosis [21]. It should be noted that while abnormalities in the acoustic reflex were found, in no case were reflexes entirely absent for stimulation of both ears for all reflex conditions.…”

Auditory Brain Stem Responses and Nonsense Monosyllable Perception Test Findings for Patients with Auditory Nerve and Brain Stem Lesions

“…The discrimination of monosyllables was worse in the ear contralateral to the abnormal ABR. Stephens, et al, 9 found that unilateral abnormalities in low redundancy speech tests were related to contralateral wave V abnormalities on the ABR. The generator of waves IV and V in humans is presumed to be the up· per brain stem which is beyond the decussation at the level of superior olivary complex.…”

“…The right ear showed only wave I and normal maximum intelligibility scores without rollover. However, Stephens, et al, 9 reported that unilateral abnormalities in low redundancy speech tests were related to ipsilateral wave IV abnormalities. Some group B patients had only wave I elicited bilaterally, but other audiologic data were normal.…”

Reversible Audiological Results in a Patient with an Extra-Axial Brain Stem Tumor

“…'5' l9 ment. !% 14, 16 The final comment on the present case is one pertaining to use of a test battery approach. Many of the tests administered yielded normal results.…”