Monitoring of brain-stem trigeminal evoked potentials. Clinical applications in posterior fossa surgery

Jean F. Soustiel, Hava Hafner, Andrei V. Chistyakov, Joseph N. Guilburd, Menashe Zaaroor, Elliot Yussim, Moshe Feinsod

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Brain-stem trigeminal evoked potentials (BTEPs) were monitored intraoperatively in 17 patients during posterior fossa surgery. Satisfactory BTEP recording was performed in all patients without technical problems or interfering with the activity of the operating team. The BTEP was not altered by anesthetic agents or muscle relaxants. Intraoperative monitoring of the BTEP showed wave form alterations or increasing peak latencies in 10 patients. Among these patients, the BTEP demonstrated a dynamic correlation with the surgical process in 8 instances. Two major causative surgical manipulations were identified: cerebellar retraction in 4 cases and tumor dissection from the brain-stem in 6 cases. Withholding the dissection of the tumor, readjusting a cerebellar retractor or further modifying the surgical attitude resulted in partial or complete return of the wave form in 7 patients. The BTEP at the end of surgery proved to correlate with the immediate surgical outcome in most instances. We concluded that the intraoperative monitoring of the BTEP was feasible and suggested, despite the small number of patients, a potential value in the survey of brain-stem functions during posterior fossa surgery.

Original languageEnglish
Pages (from-to)255-260
Number of pages6
JournalElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Issue number4
StatePublished - 1993
Externally publishedYes


  • Brain-stem trigeminal evoked potentials
  • Intensive care
  • Intraoperative
  • Monitoring
  • Posterior fossa


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