Neuroanesthesia & neurocritical care
Intraoperative transcranial facial motor evoked potential in vestibular schwannoma reflects short-term post operative facial nerve function
Authors' conclusion
Intraoperative Tc-fMEP monitoring may reflect facial nerve function one week to one month after surgery. In addition, in our study cystic tumors had significantly higher deterioration in postoperative facial nerve function than for solid tumors.
Study context
- Population
- Patients undergoing vestibular schwannoma surgery, January 2013 to July 2022
- Participants
- 45 consecutive cases
- Exposure
- Intraoperative transcranial facial motor evoked potential (Tc-fMEP) results vs postoperative facial nerve function
- Outcome
- Correlation of intraoperative Tc-fMEP results (warning criterion: decrease of 50% or more from baseline amplitude) with postoperative facial nerve function
- Follow-up
- Immediately after surgery to one year
Methodological detailsconsecutive cases, single-centre
- Consecutive cases
- Single-centre
Main finding
As reported in the abstract
Correlation of Tc-fMEP results with facial nerve function
- Tc-fMEP results significantly correlated with facial nerve function one week after surgery
- P < 0.01
- Tc-fMEP results significantly correlated with facial nerve function one month after surgery
- P < 0.01
- NPV one month after surgery
- 89%
Observational data: associations, not effects.
Further findings
Facial nerve function preservation rate (House and Brackmann grade I-II) · one year
- Preservation rate
- 88%
Facial nerve function, cystic vs solid tumors · one year
- Significantly worse with cystic than solid tumors
- P = 0.04
Feasibility of Tc-fMEP monitoring
- Successfully performed in all cases
- 45
Original publication
Intraoperative transcranial facial motor evoked potential in vestibular schwannoma reflects short-term post operative facial nerve function. J Clin Monit Comput. Published 5 June 2025. doi:10.
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