Grundy B L, Procopio P T, Jannetta P J, Lina A, Doyle E
Neurosurgery. 1982 Jun;10(6 Pt 1):766-70. doi: 10.1227/00006123-198206010-00019.
Reversible changes in brain stem auditory evoked potentials (BAEPs) occurred in a patient with hemifacial spasm when she was positioned for retromastoid craniectomy. The peak latencies increased and the amplitudes decreased. These alterations persisted for 3 hours, but returned immediately toward normal when the head was removed from pin fixation and the neck was returned to a neutral position. Similar BAEP changes were documented during a second procedure. Audiograms were normal pre- and postoperatively, although minimal BAEP changes were seen after operation. Our observation sheds light on possible mechanisms of intraoperative BAEP alteration and provides new information about the degree and duration of intraoperative BAEP distortion that can be tolerated in at least some cases without permanent neurological sequelae.
一名面肌痉挛患者在接受乳突后颅骨切除术摆放体位时，脑干听觉诱发电位（BAEPs）出现可逆性变化。峰潜伏期延长，波幅降低。这些改变持续了3小时，但当头部从针固定中移出且颈部恢复到中立位置后，立即恢复正常。在第二次手术过程中也记录到了类似的BAEP变化。术前和术后听力图均正常，尽管术后可见轻微的BAEP变化。我们的观察揭示了术中BAEP改变的可能机制，并提供了关于术中BAEP失真的程度和持续时间的新信息，至少在某些情况下，这种失真在没有永久性神经后遗症的情况下是可以耐受的。
