J Korean Neurosurg Soc.  1987 Dec;16(4):1061-1072.

Significance of Brainstem Auditory Evoked Potentials in Posterior Fossa Surgery

• Roh SW
• Chung SS
• Park YG
• Rhim SC
• Lee KC

Abstract

To preserve function of the acoustic nerve and brainstem during posterior fossa surgery, the authors monitored(brainstem auditory evoked potentials) in 42 cases of posterior fossa surgery who were operated at the Department of Neurosurgery of Yonsei University College of Medicine from March, 1983 to February, 1987. The results were summarized as followings : 1) There were 28 cases of hemifacial spasm, 13 cases of trigeminal neuralgia and 1 case of cerebellopontine angle tumor. 2) Among the 41 cases of neurovascular decompression, there were 10 cases(24%) with hearing impairment postoperatively. But there was no postoperative auditory dysfunction in 13 cases of hemifacial spasm in which caudal approach was utilized. 3) There was no postoperative auditory dysfunction in the patients who showed intraoperative BAEPs of Types I, II, and III which were characterized by no loss of waves, but 10 cases(77%) who showed BAEPs of types IV, V and VI which were characterized by loss of the waves showed auditory dysfunction postoperatively.

Keyword

Brainstem auditory evoked potential; Intraoperative monitoring; Neurovascular decompression; Auditory dysfunction

MeSH Terms

Brain Stem*
Cochlear Nerve
Decompression
Evoked Potentials, Auditory, Brain Stem*
Hearing Loss
Hemifacial Spasm
Humans
Monitoring, Intraoperative
Neuroma, Acoustic
Neurosurgery
Trigeminal Neuralgia