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Macular Photocoagulation Study (MPS) Clinical Trials Facts presented on Clinical Trials Search isn't designed to be a substitute for proven healthcare advice, calls or treatment using a real mD. We aren't mDs. Always confer with your physician on Macular Photocoagulation Study (MPS) conditions. Clinical Trials Search.org is a website dedicated to listing clinical research studies in human subjects. Macular Photocoagulation Study (MPS) Clinical research trials and Macular Photocoagulation Study (MPS) healthcare trials happen in a lot of of localities across the United States of America. A clinical trial or clinical study is a research project with human volunteer subjects. Clinical drug trials and pharmaceutical clinical trials generally measure the potency of new drugs. The aim of the studies / undertakings is to answer particular human medical questions. Clinical trials are a popular manner for doctors, government agencies, and private sector corporations to discover remedies for all kinds of circumstances, such as Macular Photocoagulation Study (MPS). Macular Photocoagulation Study (MPS) Clinical Trials and other clinical trials allow volunteers to get healthcare treatment alternatives before they are available to the general public. Most times the participants receive treatment for without cost, and occasionally they are paid for their time. Sometimes there is a cost for a Macular Photocoagulation Study (MPS) clinical trial. Human subjects often receive the most effective healthcare possible for their Macular Photocoagulation Study (MPS) condition. Risks are a reality, nonetheless, and may include more or frequent dr. calls, healthcare hazards (perhaps life-threatening), and/or the treatment being ineffective. Trials are federally governed with rigorous guidelines to protect clinical trials subjects.
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Home > "M" Clinical Trials Conditions > Macular Photocoagulation Study (MPS)  Macular Photocoagulation Study (MPS)
Macular Photocoagulation Study (MPS)
For Condition: Choroidal Neovascularization,Macular Degeneration,Histoplasmosis
Status: No longer recruiting
Sponsor(s): National Eye Institute (NEI) ,
Synopsis: To evaluate laser treatment of choroidal neovascularization (CNV) through randomized, controlled clinical trials. The Macular Photocoagulation Study (MPS) consisted of three sets of randomized, controlled clinical trials. Change in best-corrected visual acuity from baseline was the primary outcome for all MPS trials. Other measures of vision are evaluated in each set of trials. The purpose of each is described below. Argon Study: To determine whether argon blue-green laser photocoagulation of leaking abnormal blood vessels in choroidal neovascular membranes outside the fovea (200 to 2,500 microns from the center of the foveal avascular zone [FAZ]) is of benefit in preventing or delaying loss of central vision in patients with age-related (senile) macular degeneration (AMD), presumed ocular histoplasmosis (POH), and idiopathic neovascular membranes (INVM). A separate trial was conducted for each of the three underlying conditions. Krypton Study: To determine whether krypton red laser photocoagulation of choroidal neovascular lesions with the posterior border 1 to 199 microns from the center of the FAZ is of benefit in preventing or delaying large losses of visual acuity in patients with AMD, POH, and INVM. A separate trial was conducted for each of the three underlying conditions. Foveal Study: To determine whether laser photocoagulation is of benefit in preventing or delaying further visual acuity loss in patients with new (never treated) or recurrent (previously treated with laser photocoagulation) choroidal neovascularization under the center of the FAZ. Two separate trials, one for each type of lesion, were carried out.
Details: In each randomized trial conducted by the MPS Group, focal laser photocoagulation was compared to observation without treatment. Patients were assigned to laser treatment or to observation with equal probability. The first set of MPS randomized trials, the Argon Study, focused on the effectiveness of photocoagulation with argon blue-green laser in eyes with discrete extrafoveal choroidal neovascularization. The study investigators, who began recruiting patients in 1979, estimated that 550 patients with AMD and 750 with POH would be required. Follow-up was to continue for 5 years to determine whether argon laser photocoagulation treatment could prevent or delay visual acuity loss in these patients. After the initiation of the Argon Study, a new krypton red laser became available. The new wavelength offered theoretical advantages over the argon laser for treating CNV that extended inside the FAZ of the macula. The Krypton Study design was analogous to the Argon Study, with the investigation of three underlying conditions, except that CNV was closer to the FAZ center. The third set of MPS clinical trials, the Foveal Study, was designed to determine whether laser photocoagulation was effective for delaying or preventing further visual acuity loss in AMD patients who have subfoveal CNV. Among patients assigned to laser treatment in the Foveal Study, argon laser treatment was compared with krypton red laser treatment of these lesions. The investigators originally projected that about 350 patients would be required for each clinical trial of the Foveal Study.
Eligibility:
Study Type: Interventional, Treatment, Randomized
Minimum Age/Maximum Age: 18 Years/
Genders: Both
Protocol Entry Criteria: Common Eligibility Criteria for the Argon, Krypton, and Foveal Studies: To be eligible, men and women must have been experiencing visual symptoms attributable to the macular lesion, such as decreased visual acuity or Amsler grid distortion, at the time of entry into the study. They also must have had visible, well-demarcated hyperfluorescence characteristic of classic choroidal neovascularization on fluorescein angiography. AMD patients were 50 years of age or older and had drusen visible in the macula of at least one eye. POH patients were at least 18 years old and had at least one characteristic histo spot in one or both eyes. INVM patients were at least 18 years old and had no evidence of AMD, POH, angioid streaks, high myopia, diabetic retinopathy, or any other condition that could be the cause of the neovascularization. In particular, INVM patients had neither drusen greater than MPS Standard Photograph No. 1.1 nor histo spots in either eye. Additional Patient Eligibility Criteria for the Argon Study: Each patient had a visible serous detachment of the sensory retina with a diffuse area of leakage, discrete choroidal neovascularization outside the fovea (200-2,500 microns from the center of the FAZ), and visual acuity of 20/100 or better in the study eye. Additional Patient Eligibility Criteria for the Krypton Study: All patients had a neovascular lesion consisting of neovascularization and possibly blood and/or pigment that extended into the FAZ. The posterior border of CNV could extend as close as 1 micron to the FAZ center. Visual acuity of the study eye was 20/400 or better. Additional Patient Eligibility Criteria for the Foveal Study: Only patients with AMD were eligible for this study. Fluorescein angiography of the eligible eye had to show evidence of a leaking choroidal neovascular membrane, some part of which extended under the center of the FAZ, or a neovascular lesion consisting of an old laser treatment scar and contiguous leaking neovascularization within 150 microns of the center of the FAZ. New, never-treated subfoveal lesions were less than four disc areas in size. Recurrent lesions were less than six disc areas in size, including the old treatment scar and new neovascularization. Best-corrected visual acuity was no better than 20/40 and no worse than 20/320.
Total Enrollment:
Location and Contact Information:
Additional Information:
Study ID Numbers: NEI-60;
Study Start Date: February 1979
Record last reviewed: June 2002
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00000158
Other Histoplasmosis Studies:
1. Phase I Study of Corticosteroid Treatment of Ill-defined Choroidal Neovascularization in Age-related Macular Degeneration
2. Fluocinolone Implant to Treat Macular Degeneration
3. Macular Photocoagulation Study (MPS)
Related Studies:
Other Histoplasmosis Clinical Trials
Other Clinical Trials
Other Clinical Trials
Macular Photocoagulation Study (MPS)
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