Intraoperative continuous monitoring of facial motor evoked potentials in acoustic neuroma surgery

Abstract

The preservation of facial nerve function is one of the primary objectives in acoustic neuroma surgery. We detail our method of continuous intraoperative facial motor evoked potential (MEP) monitoring and present criteria for the preservation of facial nerve function to avoid postoperative facial nerve palsy. Our study population was comprised of 15 patients who did not (group 1), and 20 who did (group 2) undergo facial MEP monitoring during surgery to remove acoustic neuromas. In group 2, we continuously stimulated the facial motor cortex at 5- or 10-s intervals throughout surgery. Electromyograms (EMGs) were recorded from the contralateral orbicularis oculi- and orbicularis oris muscles. Optimal anode and cathode placement was at the facial motor cortex and the vertex, respectively. Postoperative facial palsy occurred in 8 of the 15 group 1 patients; in 2 it improved to grade II at 6 months after the operation. Of the 20 group 2 patients, 7 suffered postoperative facial palsy. At 6 months after the operation, their facial nerve function was normal. At the end of the operation, the ratio of the amplitude of the supramaximal EMG to the amplitude at the dural opening was 39.6 % in patients with- and 94.3 % in patients without transient postoperative facial palsy. Continuous facial MEP monitoring not only alerts to surgical invasion of the facial nerves but also helps to predict postoperative facial nerve function. To preserve a minimum amplitude ratio of 50 %, even transient postoperative facial palsy must be avoided. MEP monitoring is an additional useful modality for facial nerve monitoring during acoustic neuroma surgery.

Peripheral nerve function estimation by linear model of multi‐ CMAP responses for surgical intervention in acoustic neuroma surgery

“…; Tokimura et al. ). The HB grading system ranges from grades of I to VI, where grade I refers to normal function, and grade VI indicates complete paralysis.…”

“…; Tokimura et al. ), and poor postoperative nerve outcomes are observed with an absence of CMAP responses (Colletti et al. ; Dong et al.…”

“…; Tokimura et al. ). Greater stimulus intensities allow more electrical current to penetrate through the axon in the nerve trunk, causing motor recruitment (Fig.…”

“…; Tokimura et al. ). However, the CMAP baseline generally cannot be recorded at the beginning of surgery in the presence of a large acoustic tumor (>2.5 cm diameter) because the tumor mass fully covers the operative area.…”

“…; Tokimura et al. ). This property may be a useful basis for investigating facial nerve functional preservation.…”