Advantage of Using Intraoperative Visual Evoked Potentials to Preserve Visual Function During Surgical Procedures Near the Optical Pathways (VISUOPEV)
Visual morbidity (visual acuity and/or visual field deficit) must be taken into account during neurosurgical procedures for lesions near the optical pathways. Part of this morbidity is due to surgical manipulation. There is no validated tool for intraoperative visual monitoring and few publications have studied this issue.
In a preliminary work based on analysis of these publications, we defined technical, anaesthetic and analytical parameters in order to optimise intraoperative visual evoked potentials monitoring. These parameters are special devices used for transpalpebral stimulation, complete intravenous anaesthesia without halogen or nitrous oxide, and pertinent analysis criteria of visual evoked potential (VEP). We suppose that these improvements will increase reliability of intraoperative VEP.
|Surgery Optic Nerve and Pathway Injury||Device: Visual evoked potentials monitoring during neurosurgery - Vision monitor MonOpera®|
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
|Official Title:||Advantage of Using Intraoperative Visual Evoked Potentials to Preserve Visual Function During Surgical Procedures Near the Optical Pathways|
- Evolution of visual function six months after surgery. [ Time Frame: Month 6 after surgery ]Visual function : visual field and visual acuity six months after surgery.
- Score of the visual field. [ Time Frame: Month 6 after surgery ]
- Score of visual acuity [ Time Frame: Month 6 after surgery ]
- Average diameter of the optic nerve fibers measured with Optical coherence tomography [ Time Frame: Month 6 after surgery ]
|Study Start Date:||January 2012|
|Study Completion Date:||September 2014|
|Primary Completion Date:||September 2014 (Final data collection date for primary outcome measure)|
Device: Visual evoked potentials monitoring during neurosurgery - Vision monitor MonOpera®
Visual assessment (visual field, visual acuity, pattern visual evoked potential) are realised before and after surgery.
Flash and steady state visual evoked potential are measured during the surgical procedure at different times.
This genuine optimised monitoring in France, set up in association with Metrovision company, should help increasing intraoperative VEP reliability as a monitoring tool for visual pathways function.
In this study, we assess the predictive value of relevant intraoperative variations of VEP (more than 50% variation of latency and amplitude) on the visual prognosis at six months after surgery The visual assessment consisting of a visual field, a visual acuity, and the performance of pattern transient VEP, will be performed by an ophthalmologist before surgery, and at three and six months after surgery. An electroencephalogram with photostimulatory lighting will be used in pre-operative and will validate the absence of photo-induced epilepsy risk.
During the intervention, VEPs associated to an electroretinogram will be performed by a neurosurgeon trained to the use of these tools by Metrovision company:
- Under general anaesthesia, but before any surgery.
- During the surgery, at predetermined surgical times (while performing the craniotomy or the sphenoid opening, at various times during the perioptic lesion dissection, after the lesion resection, when closing).
Please refer to this study by its ClinicalTrials.gov identifier: NCT01517789
|CHU Bordeaux - hôpital Pellegrin|
|Bordeaux, France, 33000|
|Principal Investigator:||Daniel LAGUERRE, Dr||University Hospital, Bordeaux, France|
|Study Chair:||Paul PEREZ, Dr||University Hospital, Bordeaux, France|