Clinical trial NCT06495580: Optic Nerve Stimulation To Prevent Visual Deficits After Endoscopic Cranial Approaches
Official title: Optimizing Visual Outcomes: Use of Optic Nerve Stimulation in Endoscopic Cranial Approaches
Study type: INTERVENTIONAL
Overall status: NOT_YET_RECRUITING
Phase: NA
Conditions: Optic Nerve Injuries
Sellar Tumor
Skull Base Neoplasms
Lead sponsor: University of California, San Francisco
Sponsor class: OTHER
First posted: 2024-07-10
Enrollment: 20
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: SINGLE_GROUP
Intervention model description: The study will enroll adult (18 y.o. and older) patients undergoing open or endonasal endoscopic surgery for suprasellar tumors including meningiomas, craniopharyngiomas and pituitary adenomas
Primary purpose: PREVENTION

Brief summary: Assessing the function of the optic nerve is paramount during various neurosurgical procedures. Effective optic nerve monitoring has remained elusive as Visual Evoked Potentials (the current existing tool) provides only diffuse and delayed assessment of nerve function. Here, the investigators propose a prospective study involving adult patients (aged 18 years and older) undergoing endonasal or open cranial approaches around the optic nerves, who will receive pre- and post-operative visual evaluations. During surgery, the optic nerve and chiasm will be stimulated, and the response will be recorded in both eyes and the occipital cortex via skin electrodes. The investigators aim to utilize anterograde optic nerve microstimulation to assess the nerve's integrity during open and endoscopic cranial approaches. Electrophysiological readings will be acquired, as is routine in the operating room, by our team of experts, and intraoperative findings will be correlated with post- surgical clinical outcomes. Our objective is to utilize existing technology in the operating room to safely and effectively monitor optic nerve function during surgery.

Detailed description: Our hypothesis is that utilizing anterograde optic nerve microstimulation during open and endoscopic cranial approaches will allow for more accurate and real-time assessment of optic nerve function compared to the current standard of Visual Evoked Potentials. The investigators predict that this novel approach will lead to improved intraoperative monitoring and better correlation with post- surgical clinical outcomes.

The study design proposed is interventional and prospective. It involves implementing a novel approach, anterograde optic nerve microstimulation, during surgical procedures to assess optic nerve integrity. This design entails actively intervening during the surgical process to stimulate the optic nerve and record responses, indicating an interventional approach.

Eligibility criteria: Inclusion Criteria:

* Patients diagnosed with suprasellar tumors including meningiomas, craniopharyngiomas and pituitary adenomas.
* Must not present with any permanent or temporal visual deficit.
* Must receive an open or endoscopic endonasal procedure as part of their care.

Exclusion Criteria:

* Preexisting visual impairments unrelated to the tumor.
* History of prior cranial surgeries or radiation therapy.
* Significant cognitive impairment or inability to provide informed consent
* Contraindications to microstimulation procedures such as uncontrolled coagulopathy or active infection.
* Patients with tumors located outside the sellar region or those requiring emergent or urgent surgery due to life-threatening complications.
* Additionally, individuals with systemic conditions or comorbidities that may significantly impact visual function or surgical outcomes, such as uncontrolled diabetes mellitus or severe cardiovascular disease.

Primary outcomes:
measure: Visual Deficits
timeFrame: 6 weeks after surgery date.
Secondary outcomes:
Other outcomes:
Locations:
city: San Francisco
country: United States
facility: University of California, San Francisco
state: California
Study officials:
affiliation: UCSF Department of Neurological Surgery
name: Ezequiel Goldschmidt, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Margalit NS, Lesser JB, Moche J, Sen C. Meningiomas involving the optic nerve: technical aspects and outcomes for a series of 50 patients. Neurosurgery. 2003 Sep;53(3):523-32; discussion 532-3. doi: 10.1227/01.neu.0000079506.75164.f4.
citation: Cohen AR, Cooper PR, Kupersmith MJ, Flamm ES, Ransohoff J. Visual recovery after transsphenoidal removal of pituitary adenomas. Neurosurgery. 1985 Sep;17(3):446-52. doi: 10.1227/00006123-198509000-00008.
citation: Jashek-Ahmed F, Cabrilo I, Bal J, Sanders B, Grieve J, Dorward NL, Marcus HJ. Intraoperative monitoring of visual evoked potentials in patients undergoing transsphenoidal surgery for pituitary adenoma: a systematic review. BMC Neurol. 2021 Jul 23;21(1):287. doi: 10.1186/s12883-021-02315-4.
citation: Newman S. A prospective study of cavernous sinus surgery for meningiomas and resultant common ophthalmic complications (an American Ophthalmological Society thesis). Trans Am Ophthalmol Soc. 2007;105:392-447.
citation: Carnevale JA, Babu CS, Goldberg JL, Fong R, Schwartz TH. Visual deterioration after endonasal endoscopic skull base surgery: causes, treatments, and outcomes. J Neurosurg. 2021 Oct 1;136(4):1103-1113. doi: 10.3171/2021.3.JNS204378. Print 2022 Apr 1.
citation: Sakata K, Komaki S, Takeshige N, Negoto T, Kikuchi J, Kajiwara S, Orito K, Nakamura H, Hirohata M, Morioka M. Visual Outcomes and Surgical Approach Selection Focusing on Active Optic Canal Decompression and Maximum Safe Resection for Suprasellar Meningiomas. Neurol Med Chir (Tokyo). 2023 Sep 15;63(9):381-392. doi: 10.2176/jns-nmc.2021-0142. Epub 2023 Jul 10.
citation: Chung SB, Park CW, Seo DW, Kong DS, Park SK. Intraoperative visual evoked potential has no association with postoperative visual outcomes in transsphenoidal surgery. Acta Neurochir (Wien). 2012 Aug;154(8):1505-10. doi: 10.1007/s00701-012-1426-x. Epub 2012 Jun 29.
citation: Qiao N, Yang X, Li C, Ma G, Kang J, Liu C, Cao L, Zhang Y, Gui S. The predictive value of intraoperative visual evoked potential for visual outcome after extended endoscopic endonasal surgery for adult craniopharyngioma. J Neurosurg. 2021 May 7;135(6):1714-1724. doi: 10.3171/2020.10.JNS202779. Print 2021 Dec 1.
citation: Benedicic M, Bosnjak R. Intraoperative monitoring of the visual function using cortical potentials after electrical epidural stimulation of the optic nerve. Acta Neurochir (Wien). 2011 Oct;153(10):1919-27. doi: 10.1007/s00701-011-1098-y. Epub 2011 Aug 5.
citation: Sasaki T, Itakura T, Suzuki K, Kasuya H, Munakata R, Muramatsu H, Ichikawa T, Sato T, Endo Y, Sakuma J, Matsumoto M. Intraoperative monitoring of visual evoked potential: introduction of a clinically useful method. J Neurosurg. 2010 Feb;112(2):273-84. doi: 10.3171/2008.9.JNS08451.
citation: Benedicic M, Bosnjak R. Optic nerve potentials and cortical potentials after stimulation of the anterior visual pathway during neurosurgery. Doc Ophthalmol. 2011 Apr;122(2):115-25. doi: 10.1007/s10633-011-9265-2. Epub 2011 Mar 16.