- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02088151
Selective Retinal Pigment Epithelium Laser Therapy for Macular Disease of the Retina
Selective Retinal Pigment Epithelium Laser Therapy (SRT) for Macular Disease of the Retina
Laser photocoagulation of the retina targeting the outer layers is an established therapy for proliferative retinopathy and macular edema from diabetic microangiopathy or retinal vein occlusion, centrals serous retinopathy, and extrafoveal subretinal neovascular membranes. However, collateral damage occurs and scotomas can result when using conventional lasers with pulse duration of 100ms and more. This is particularly relevant for laser treatments of the macula where the main therapeutic effect results from stimulation of the retinal pigment epithelium cells and photoreceptor damage is thought to be an unnecessary side effect. Recent experimental research with new laser devices using much shorter pulse duration has shown that photoreceptor damage can be greatly reduced and the retinal pigment epithelium selectively targeted, hence the term selective retinal pigment epithelium laser therapy (SRT). Investigators hypothesize that SRT is equally effective as standard laser photocoagulation for macular disease but minimizes local visual field defects.
In this study, patients with central serous retinopathy, macular edema from diabetic microangiopathy or branch vein occlusion, and non-exudative age-related macular degeneration will be treated with SRT. Patients will be assessed 1, 3 and 6 months after treatment.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Background
Laser photocoagulation of the retina targeting the outer layers is an established therapy for proliferative retinopathy and macular edema from diabetic microangiopathy or retinal vein occlusion, centrals serous retinopathy, and extrafoveal subretinal neovascular membranes. However, collateral damage occurs and scotomas can result when using conventional lasers with pulse duration of 100ms and more. This is particularly relevant for laser treatments of the macula where the main therapeutic effect results from stimulation of the retinal pigment epithelium cells and photoreceptor damage is thought to be an unnecessary side effect. Recent experimental research with new laser devices using much shorter pulse duration has shown that photoreceptor damage can be greatly reduced and the retinal pigment epithelium selectively targeted, hence the term selective retinal pigment epithelium laser therapy (SRT). In age-related macular degeneration, regression of drusen has been observed after laser treatment with convention laser or SRT. Investigators hypothesize that SRT is equally effective as standard laser photocoagulation for macular disease but minimizes local visual field defects.
Objective
To assess the efficacy of SRT in patients with central serous retinopathy, macular edema from diabetic microangiopathy or branch vein occlusion, and non-exudative age-related macular degeneration. Up to five patients with proliferative diabetic retinopathy can optionally be treated with SRT too.
Methods
At baseline and during follow-up patients will receive a full ophthalmic examination including optical coherence tomography, fundus autofluorescence imaging, fluorescein angiography (FA), and visual acuity testing. SRT (R:GEN Laser System by Lutronic Corporation, Korea) will be delivered under topical anesthesia. For titration of energy spots will first be applied outside the major arcades. Immediately thereafter FA will be performed for extrapolation of the laser dose, since the treatment is sub-threshold and laser spots will not be visible biomicroscopically. The patient will then be treated at the discretion of the ophthalmologist with up to 500 laser burns. One hour after the laser treatment FA will be repeated to confirm the treatment effect. Patients will be assessed 1, 3 and 6 months after treatment. Pulse duration can be chosen between 200ns and 2μs. The maximum pulse energy will be 1mJ. 1-30 pulses will be applied for every laser burn at a frequency of 100Hz.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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-
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Bern, Switzerland, 3010
- Department of Ophthalmology, Bern University Hospital
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Age 18 or over
- Written informed consent
- Willingness to attend follow-up visits
- Central serous chorioretinopathy affecting visual acuity
- Macular edema from branch retinal vein occlusion
- Macular edema from diabetic microangiopathy
- Age-related macular degeneration with confluent soft drusen
- Age-related macular degeneration with geographic atrophy
Exclusion Criteria
- Macular ischemia
- Retinal hemorrhage impeding retinal laser treatment
- Subretinal neovascular membrane
- Vitreous hemorrhage
- Allergy to fluorescein
- Participation in other clinical trials
Study Plan
How is the study designed?
Design Details
- Primary Purpose: TREATMENT
- Allocation: NA
- Interventional Model: SINGLE_GROUP
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
EXPERIMENTAL: Treatment
Patients receive selective retinal pigment epithelium laser treatment
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Patients receive selective retinal pigment epithelium laser treatment using the R:GEN Laser System by Lutronic Corporation, Korea.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Visual Acuity according to ETDRS protocol
Time Frame: 6 months
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6 months
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Retinal thickness measured by optical coherence tomography
Time Frame: 6 months
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6 months
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Leakage of fluorescein in fluorescein angiography
Time Frame: 6 months
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6 months
|
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Area of absent fundus autofluorescence
Time Frame: 6 months
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Measured via fundus autofluorescence imaging
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6 months
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Collaborators and Investigators
Publications and helpful links
General Publications
- Roider J, Michaud NA, Flotte TJ, Birngruber R. Response of the retinal pigment epithelium to selective photocoagulation. Arch Ophthalmol. 1992 Dec;110(12):1786-92. doi: 10.1001/archopht.1992.01080240126045.
- Roider J, Hillenkamp F, Flotte T, Birngruber R. Microphotocoagulation: selective effects of repetitive short laser pulses. Proc Natl Acad Sci U S A. 1993 Sep 15;90(18):8643-7. doi: 10.1073/pnas.90.18.8643.
- Roider J, Lindemann C, el-Hifnawi el-S, Laqua H, Birngruber R. Therapeutic range of repetitive nanosecond laser exposures in selective RPE photocoagulation. Graefes Arch Clin Exp Ophthalmol. 1998 Mar;236(3):213-9. doi: 10.1007/s004170050067.
- Roider J, Brinkmann R, Wirbelauer C, Birngruber R, Laqua H. Variability of RPE reaction in two cases after selective RPE laser effects in prophylactic treatment of drusen. Graefes Arch Clin Exp Ophthalmol. 1999 Jan;237(1):45-50. doi: 10.1007/s004170050193.
- Roider J, Brinkmann R, Wirbelauer C, Laqua H, Birngruber R. Subthreshold (retinal pigment epithelium) photocoagulation in macular diseases: a pilot study. Br J Ophthalmol. 2000 Jan;84(1):40-7. doi: 10.1136/bjo.84.1.40.
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 (ESTIMATE)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Pathologic Processes
- Cardiovascular Diseases
- Vascular Diseases
- Eye Diseases
- Retinal Degeneration
- Retinal Diseases
- Embolism and Thrombosis
- Venous Thrombosis
- Thrombosis
- Metaplasia
- Macular Degeneration
- Macular Edema
- Retinal Vein Occlusion
- Neovascularization, Pathologic
- Central Serous Chorioretinopathy
- Retinal Neovascularization
Other Study ID Numbers
- 003/10
- 2011-MD-0006 (OTHER: Swissmedic)
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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