Laser and Medical Treatment of Diabetic Macular Edema

Completed · Phase 3

Conditions studied: Macular Degeneration

In brief

This study will compare the side effects of two laser treatments for diabetic macular edema, a common condition in patients with diabetes. In macular edema, blood vessels in the retina, a thin layer of tissue that lines the back of the eye become leaky and the retina swells. The macula, the center part of the retina that is responsible for fine vision may also swell, causing vision loss. Traditional laser treatment (argon blue or green or yellow) for macular swelling, or edema, causes scarring that can expand and possibly lead to more loss of vision. Studies with a different type of laser (diode) may be less damaging. The results of this study on side effects of the treatments will be used to design a larger study of effectiveness. This study will also examine whether celecoxib (Celebrex® (Registered Trademark)), an anti-arthritis drug that reduces inflammation and swelling, can reduce inflammation and swelling of the retina. Patients with elevated cholesterol levels will be invited to participate in a cholesterol reduction part of the study to compare normal-pace cholesterol reduction with accelerated reduction. Patients 18 years of age and older with type 1 or type 2 diabetes and macular edema that requires laser treatment may be eligible for this study. Candidates will be screened with the following tests and procedures: * Medical history: to review past medical conditions and treatments. * Physical examination: to measure vital signs (pulse, blood pressure, temperature, breathing rate) and examine the head and neck, heart, lungs, abdomen, arms and legs. * Eye examination: to assess visual acuity (eye chart test) and examine pupils, lens, retina, and eye movements. The pupils will be dilated with drops for this examination. * Blood tests: to measure cholesterol, blood clotting time, hemoglobin A1C (a measure of diabetes control), and to evaluate liver and kidney function. * Eye photography: to help evaluate the status of the retina and changes that may occur in the future. Special photographs of the inside of the eye are taken using a camera that flashes a bright light into the eye. From 2 to 20 pictures may be taken, depending on the eye condition. * Fluorescein angiography: to evaluate the eye's blood vessels. A yellow dye is injected into an arm vein and travels to the blood vessels in the eyes. Pictures of the retina are taken using a camera that flashes a blue light into the eye. The pictures show if any dye has leaked from the vessels into the retina, indicating possible blood vessel abnormality. Participants will be randomly assigned to take celecoxib or placebo (an inactive, look-alike pill). Participants who have elevated cholesterol levels may return for a brief visit after 1 month. All patients will return for follow-up visits at 3, 6, and 12 months. Patients who require laser treatment will be randomly assigned to one of the two laser treatments. For these procedures, eye drops are put in the eye to numb the surface and a contact lens is placed on the eye during the laser beam application. Several visits may be required for additional laser treatments. The maximum number of treatments depends on how well the treatment is working. Patients who respond well to the study medication may receive no laser treatments. After the first year, patients will be followed every 6 months until either the patient returns for a 3-year visit, the last enrolled patient returns for the 1-year visit, or the patient requests to leave the study. During the follow-up visits, patients' response to treatment will be evaluated with repeat tests of several of the screening exams.

Key facts

Study ID: NCT00050479
Run by: National Eye Institute (NEI)
People needed: 100
Starts: 2002-12-01
Expected to finish: 2006-07-01
Last updated by the study team: 2006-07-19

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may not qualify if…

To be eligible for the study, each participant must not satisfy an ocular exclusion cirterion in both eyes.
Retinopathy that requires scatter photocoagulation immediately.
Ocular disease other than diabetic retinopathy that may confound the outcome of the study (e.g. age-related macular degeneration, drug toxicity, uveitis, etc.).
Prior of current macular detachment in the eligible eye(s).
Use of an investigational drug within 30 days of enrollment.
Malaborsorption syndrome.
Concurrent administration of the anti-obesity drug orlistat (Xenical).
Positive serum pregnancy test or currently lactating for women of childbearing potential.
Chronic requirement (e.g., greater than or equal to 4 weeks at a time) for ocular medication for diseases that, in the judgement of the examining physician, are vision thereateniong or may affect the primary outcome (artificial tears are permitted).
History of cancer and prognosis of survival of less than 3 years.
Participants whose diabetic macular edema, in the opinion of the Principal Investigator, cannot benefit from laser treatments, including those with subretinal fibrosis, severe macular non-perfusion, or parafoveal leakage in oth eyes.
Participants that have a history of focal laser treatment, and in the opinion of the investigator are thought to be refractory (e.g., > 50 micron burns or equivalent) to laser treatment or wwere treated within 3 months of baseline.
Participants with clear vireal-retinal tracion wiich in the opinion of the investigator needs to be treated as a contributor macular edema.
Participants requiriing herapy with topaical ophthalmic prostaglandin analogues.
Laboratory values outside normal limits and considered clinically significant by the investigator.
Past or current liver disease, which precludes the use of the lipid-lowering drugs.
Used Celebrex [Registered Trademark] or any other COX-2 inhibitor, NSAIDs, or ocular topical NSAID use great than 3 days per week for a period of 4 weeks or more within 6 months prior to enrollment, or likely need during the study (Aspirin dose of 325 mg per day is permitted).
Concurrent warfarin therapy or known bleeding diathesis.
Concurrent lithium therapy.
History of peptic ulcer disease within 1 year prior to enrollment.
History of kidney disease (serum creatinine greater than 2.5 mg/dL, or need for dialysis).
Allergy to sulfa- containing compounds, NSAIDs, or demonstrtion of the aspirin triad.
History of inflammatory bowel disease.
History of mycardial infarction within 2 years prior to enrollment.

Where it is running

National Eye Institute (NEI) — Bethesda, Maryland, United States

Full record on ClinicalTrials.gov

Trial information comes from ClinicalTrials.gov and is refreshed daily. TrialsForMe does not provide medical care and does not run the studies it lists.