- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01864317
Assessment of Optic Nerve Radiation in Patients With Glaucoma and Ocular Hypertension by 7 Tesla Diffusion Tensor Imaging
Glaucoma is among the leading causes for blindness in the western world. Elevated intraocular pressure (IOP) has been identified as the most important risk factor. However, some patients progress despite adequate IOP lowering while some subjects with elevated IOP never develop glaucoma. Other patients develop glaucoma although IOP measurements were always in the normal range. Therefore, other factors must be involved. In the last years, studies using MRI have been performed and evidence has accumulated that also changes in retrobulbar structures are present, in particular in the lateral geniculate nucleus and the visual cortex. However, these studies were limited by the low spatial resolution of the MRI instruments used.
The investigators propose to overcome this problem by using an ultrahigh-field Magnetom 7T whole-body MR scanner (Siemens Medical, Germany) installed at the MR Centre of Excellence at the Medical University of Vienna. This scanner is equipped with a 32-channel head coil and the SC72 high-performance gradient system and is thus perfectly suited for structural and functional imaging. The aim of the present study is to investigate whether structural and functional parameters are altered in patients with primary open angle glaucoma (POAG), normal tension glaucoma (NTG), ocular hypertension (OHT) compared to healthy control subjects. The exact topographical survey of intracranial structures such as the LGN and the assessment of neuronal structures by DTI may allow for the better assessment of therapeutic responses to new neuroprotective agents.
Study Overview
Status
Study Type
Enrollment (Anticipated)
Phase
- Phase 2
Contacts and Locations
Study Locations
-
-
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Vienna, Austria, 1090
- Department of Clinical Pharmacology
-
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
Healthy controls
- Men and women aged over 18 years
- Normal findings in the medical history unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings
Patients with ocular hypertension
- Men and women aged over 18 years
- Normal findings in the medical history unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings except presence of ocular hypertension (defined as untreated IOP ≥ 21 mmHg on at least three measurements in the medical history, no signs of glaucomatous damage in the optic disc or the glaucoma hemifield test)
Patients with primary open angle glaucoma
- Men and women aged over 18 years
- Normal findings in the medical history unless the investigator considers an abnormality to be clinically irrelevant
- Diagnosis of manifest primary open angle glaucoma (defined as pathological optic disc appearance, glaucoma hemifield test outside normal limits and untreated IOP > 20 mmHg on at least three measurements in the medical history)
- Mean Deviation in the visual field test ≥ 10dB
Patients with normal-tension glaucoma
- Men and women aged over 18 years
- Normal findings in the medical history unless the investigator considers an abnormality to be clinically irrelevant
- Diagnosis of normal-tension glaucoma (defined as pathological optic disc appearance, glaucoma hemifield test outside normal limits and untreated IOP ≤ 20 mmHg on at least three measurements in the medical history)
- Mean Deviation in the visual field test ≥ 10dB
Exclusion Criteria:
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- Presence or history of a severe medical condition as judged by the clinical investigator
- Abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study
- Exfoliation glaucoma, pigmentary glaucoma, history of acute angle closure
- Intraocular surgery within the last 6 months
- Ocular inflammation or infection within the last 3 months
- Pregnancy, planned pregnancy or lactating
- Any metallic, electric, electronic or magnetic device or object not removable except dental fillings
- Claustrophobia
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Primary Open Angle Glaucoma
30 patients with primary open angle glaucoma
|
High resolution functional and structural imaging of the visual pathway
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Visual Field Testing
Measurement of Intraocular Pressure
|
Experimental: Normal Tension Glaucoma
30 patients with normal tension glaucoma
|
High resolution functional and structural imaging of the visual pathway
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Visual Field Testing
Measurement of Intraocular Pressure
|
Experimental: Ocular Hypertension
30 patients with ocular hypertension
|
High resolution functional and structural imaging of the visual pathway
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Visual Field Testing
Measurement of Intraocular Pressure
|
Other: Healthy subjects
30 healthy control subjects
|
High resolution functional and structural imaging of the visual pathway
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Measurement of retinal nerve fiber thickness
Visual Field Testing
Measurement of Intraocular Pressure
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
High resolution functional and structural imaging of the visual pathway
Time Frame: once on the study day (approximately 1 hour)
|
The visual pathway will be imaged with 7-Tesla MRI.
The images will be compared between the study groups.
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once on the study day (approximately 1 hour)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Retinal nerve fiber thickness
Time Frame: once on the study day (approximately 10 minutes)
|
Parameters obtained from GDX and OCT measurements will be compared between groups.
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once on the study day (approximately 10 minutes)
|
Visual field test
Time Frame: once on the study day (approximately 20 minutes)
|
Parameters from the Humphrey visual field test will be used for classification of severity of glaucoma or to prove that subjects are healthy.
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once on the study day (approximately 20 minutes)
|
Intraocular Pressure
Time Frame: once on the study day (1 minute)
|
Goldmann applanation tonometry will be used for measurement of intraocular pressure.
|
once on the study day (1 minute)
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- OPHT-220213
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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