Intraoperative Brainstem Auditory Evoked Potential Observations After Trigeminocardiac Reflex During Cerebellopontine Angle Surgery

• DOI: 10.1097/ana.0b013e3181eac551
• Publication Date: 2010-08-11T11:53:57Z
• Authors: Marcus André Acioly; Carlos Henrique C...; Andrei Koerbel; Hubert Löwenheim; Marcos Tatagiba; Alireza Gharabaghi
• Keywords: Acoustic reflex

Background The occurrence of trigeminocardiac reflex (TCR) is known to be a negative prognostic factor for hearing preservation in cerebellopontine angle tumor surgery. Our study was conducted investigate brainstem auditory evoked potential (BAEP) changes after this surgery and evaluate their impact on postoperative function. Methods Five 102 consecutive patients had an intraoperative TCR (4.9%) were retrospectively evaluated the BAEP function (7 10 d surgery). One 5 preoperatively deaf therefore excluded from analysis. Results Four with preoperative functional developed one or more episodes TCR. Intraoperative maintained 1 patient, whereas 3 cases acute deterioration occurred within 2:04 3:27 minutes (mean 2:44 min) increased wave latency, decreased amplitude, even loss. Two deteriorated waves until surgical completion postoperatively deaf. Conclusions Although no direct cause-effect relationship has yet been shown, we suggest as additional event that may cause changes. observed alterations rather than seconds incident leading both temporary permanent deterioration. This association occurrence, however, remains proven justifying further field.