Normal Tension and Chronic Open Angle Glaucoma and Cerebrospinal Fluid Composition

Study Overview
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Brief Summary
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Normal tension glaucoma (NTG) and chronic open angle glaucoma (COAG) occurring progressively with optimal conventional or intraocular pressure reducing surgery are still unsolved problems in ophthalmology. The investigators would like to investigate whether or not the composition of cerebrospinal fluid (CSF) surrounding the optic nerve (ON) in these patients is pathologic under certain conditions. They therefore compare the CSF taken during optic nerve sheath fenestration with the CSF taken during a lumbar puncture. The investigators' hypothesis is that, in patients with NTG and COAG, the composition of CSF surrounding the affected ON plays an important role in promoting progressive visual function loss.

Detailed Description
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We will recruit 30 patients with progressive visual function loss, due to Normal tension glaucoma (NTG) or chronic open angle glaucoma (COAG), despite optimal conventional or intraocular pressure reducing surgery treatment so far. We will proceed with an optic nerve sheath fenestration (ONSF) (according to the studies in the literature, e.g. Wax MB, Barrett DA, Hart WM Jr, Custer PL. Optic nerve sheath decompression for glaucomatous optic neuropathy with normal intraocular pressure. Arch Ophthalmol. 1993;111(9):1219-28.) and compare the cerebrospinal fluid (CSF) taken from the subarachnoid space (SAS) of the optic nerve (ON) with the CSF taken during a lumbar puncture, on the same day. Concentrations of neurobioactive substances will especially be studied. Visual acuity and visual field development before and after ONSF will be studied. Quality of life assessment will be done before and several times after ONSF.

Official Title
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Normal Tension and Chronic Open Angle Glaucoma, Cerebrospinal Fluid Composition in Subarachnoid Space of Affected Optic Nerves

Conditions
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Glaucoma Open-Angle

Intervention / Treatment
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* Procedure: Optic nerve sheath fenestration


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Documented progressive visual function loss over 2 years (visual field or visual acuity) Intraocular pressure measured as a maximum of 25 mmHg Possibility of receiving general anaesthesia and optic nerve sheath fenestration. Exclusion Criteria: Secondary glaucoma Oral medication to lower intraocular pressure (carboanhydrase inhibitor) Visual acuity worse than 20/400 Any other type of glaucoma (pseudoexfoliation, narrow or closed angle).
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Procedure: Optic nerve sheath fenestration|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visual acuity |  |  | 
| Visual field |  |  | 
| Quality of life assessment |  |  | 
| Laboratory markers work-up |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Glaucoma Open-Angle, Normal tension glaucoma progressive, chronic open angle glaucoma progressive, optic nerve sheath fenestration, cerebrospinal fluid, Beta-Trace Protein