Mechanism of Hearing Disturbance after Microvascular Decompression

Takayuki Ohira, Shigeo Toya, Yoshiki Nakamura, Hiromichi Mlyazaki, Masashi Nakatsukasa, Yukio Ibata, Takeshi Kawase, Jin Kanzaki, Moriichirou Takase

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In 35 posterior fossa operations with intraoperative brain-stem auditory evoked potential (BAEP) monitoring, there were seven microvascular decompression (MVD) operations performed for five cases of hemifacial spasm and two of trigeminal neuralgia. Among these seven patients, three cases, two of hemifacial spasm and one of trigeminal neuralgia, showed postoperative hearing disturbance. In these cases, intraoperative BAEPs showed aggravations of all waveform components including wave I. Otoneurological examinations revealed the hearing disturbances were caused not only by retrocochlear lesions but also by cochlear lesions. These findings suggest that postoperative hearing disturbance after MVD surgery is deeply related to circulatory disturbance of the internal auditory artery.

Original languageEnglish
Pages (from-to)749-755
Number of pages7
JournalNeurologia medico-chirurgica
Issue number8
Publication statusPublished - 1987


  • auditory evoked potentials
  • auditory nerve
  • hearing loss
  • internal auditory artery
  • microvascular decompression

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology


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