[A Significant Increase in Intraoperative Flash Visual Evoked Potential Amplitude during XXXX Surgery-Case Report].

@entity1 @entity227 @entity1276 @entity5 @entity73 @entity772 @entity2554 @entity976 @entity1662 @entity393
UNASSIGNED: The flash visual evoked potential(VEP)is a useful diagnostic modality for visual preservation during surgery. @entity393 is recognized to indicate @entity227 ;however, whether intraoperative VEP can detect visual improvement remains unclear. We describe a @entity976 case with a significant increase in VEP amplitude during surgery. A 67-year-old @entity1 presented with progressive gait disturbance and @entity1662 . Head magnetic resonance imaging demonstrated a @entity5 compressing the optic chiasm upward with significant @entity2554 . Her Glasgow @entity772 Scale was E3V3M5. Visual fields and acuity could not be examined because of @entity1662 , and she could not see/recognize objects on a table. Preoperative VEP showed reproducible waveforms. @entity5 removal by the extended transsphenoidal approach was performed with VEP monitoring. Increased VEP amplitude was observed after dural incision and persisted until the surgery ended. Postoperative VEP waveforms were also reproducible, but visual fields/acuity could not be examined because of @entity73 . Useful visual function was restored, and she became independent in daily life. The histological diagnosis was @entity976 . The @entity1 underwent ventriculo-peritoneal shunting for @entity1276 16 days after @entity5 removal. The postoperative course was uneventful and she was transferred to another hospital for rehabilitation. Intraoperative VEP may indicate visual improvement during surgery, which is a useful objective assessment for visual function in @entity1 with @entity1662 and @entity73 .
