Evaluation of Vitrectomy for Diabetic Macular Edema

NCT ID: NCT00709319

Last Updated: 2019-10-07

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 87 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2005-07-31
• Study Completion Date: 2009-02-28

Brief Summary

The study is designed as a prospective cohort study to assess changes in visual acuity and retinal thickening and surgical complications in subjects undergoing vitrectomy for diabetic macular edema.

The study also aims to identify subgroups in which there appears to be a benefit of vitrectomy and subgroups in which vitrectomy does not appear to be beneficial and to obtain data that can be used to plan a randomized trial.

Subject will be followed through 2 years, with a primary outcome at 6 months post vitrectomy surgery. The vitrectomy procedure will be performed based on the investigators usual care and is not considered part of the research although the procedure performed will be collected.

Detailed Description

Study Design The study is designed as a prospective cohort study. A randomized trial design was considered but rejected after deciding that there was insufficient equipoise on the part of the investigator group to randomize eyes with DME and vitreal traction to surgery or no surgery (thus eyes which potentially may benefit most from vitrectomy would not be included), and there was insufficient information available on the natural course or surgical outcomes of eyes with DME but without significant traction.

A cohort study provides the opportunity to collect data prospectively using a standardized protocol to assess the potential benefits and risks of vitrectomy. The results can be used to determine whether proceeding with a randomized trial has merit and what the design of the trial should be. If a randomized trial is to be conducted, the results plus the cohort study experience can be used to help design the protocol.

Study Objectives

1. To provide information on the following outcomes in eyes with Diabetic Macular Edema (DME) that undergo vitrectomy: visual acuity, retinal thickening, resolution of traction (if present), surgical complications.

2. To identify subgroups in which there appears to be a benefit of vitrectomy and subgroups in which vitrectomy does not appear to be beneficial.

3. To obtain data that can be used to plan a randomized trial.

B. Intervention Vitrectomy performed by the investigator's usual routine.

C. Duration of Follow-Up: Two years

D. Follow-up Visit Schedule Study visits for data collection at 3 and 6 months then 1, and 2 years. Additional visits follow investigator's usual routine.

E. Rationale:

There are at least two avenues of investigation that support the theoretical value of vitrectomy for the treatment of DME, based on (1) vitrectomy for the relief of traction on the macula and (2) vitrectomy to improve oxygenation of the macula leading to decreased permeability with subsequent resolution or decrease in DME.

Vitrectomy to relieve biomechanical traction on the macula has been reported widely. Schepens and coworkers discussed the role of the vitreous and vitreomacular traction in cystoid macular edema in 1984. Nasrallah et al observed in 1988 the resolution of diabetic macular edema in individuals with spontaneous separation of the vitreous gel from the retina. In 1992, Lewis and coworkers reported success with vitrectomy and peeling of a "thickened hyaloid membrane" in eyes with DME that had this anatomical feature. Since this report of a nonrandomized retrospective case series, other authors have prospectively analyzed their series and supported the concept that relief of clear-cut anteroposterior traction, usually in the setting of an epiretinal membrane complex and associated vitreous adherence, may ameliorate macular thickening and edema in DME. Evaluation of these individuals and documentation of pre and postoperative characteristics have been rendered vastly more objective by ocular coherence tomography and the Retina Thickness Analyzer. Series using optical coherence tomography (OCT) to image cases where vitreomacular traction is observed and in some cases treated, has confirmed the clinical impression of mechanical forces at work on the posterior retina and has documented the anatomic improvement with surgery. How and in which cases OCT could refine our ability to diagnose and define clinically important anatomical features or relationships has not been investigated. As Kaiser and coworkers have documented, the OCT findings in the cases that have thus far come to vitrectomy in these situations support a conclusion that the disease process has progressed very far and in many cases the individuals have actual traction retinal detachments in their maculae. These severe cases are the exception in the spectrum of DME: most cases of macular edema have no obvious vitreomacular traction, but this factor has not been investigated adequately with our newer and more sophisticated imaging techniques. It is possible that subclinical traction on the macula exists in a large number of individuals with diabetes, whose internal limiting membranes at the vitreomacular interface often have a thickened, hypercellular appearance and whose vitreous gels, gradually contracting over many years, may exert subclinical but significant traction on the compromised diabetic macular vascular bed.

The other line of reasoning and prior research that supports the possibility that vitrectomy would help DME is that articulated by Steffanson and others indicating that posterior segment oxygenation improves after vitrectomy. Using oxygen sensors on the retinal surface, these investigators have shown that retinal oxygen tensions increase after the vitreous gel is removed and the posterior segment becomes perfused by relatively oxygen-rich aqueous humor. Supporting this conclusion is the additional observation that retinal vessels decrease in caliber after vitrectomy, presumably in response to the improvement in hypoxia, although confounding factors that could contribute to this decrease, such as the addition of endolaser retinal photocoagulation, have not been ruled out. Numerous lines of investigation have elucidated factors producing permeability in retinal blood vessels. One of the most central of these factors is Vascular Endothelial Growth factor (VEGF), formerly known as Vascular Permeability Factor (VPF). VEGF is known to be upregulated by hypoxia, and downregulated by increased oxygenation. The speculated sequence of events in which vitrectomy produces improved oxygenation of the posterior segment, leading to downregulation of VEGF, leading to decreased vasopermeability, resulting in reduced macular thickening, is a plausible one. More rapid clearing of growth factors in the vitrectomized eye has also been postulated as a potential mechanism for this response.

See full protocol at drcr.net for list of references

Conditions

Diabetic Retinopathy; Diabetic Macular Edema

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

Primary

Subjects vitreomacular traction, visual acuity 20/63 to 20/400, retinal thickness \>300 microns in the central subfield on OCT, and cataract extraction not being performed in conjunction with vitrectomy.

No interventions assigned to this group

Eligibility Criteria

Inclusion Criteria

1. Age >= 18 years

2. Diagnosis of diabetes mellitus (type 1 or type 2)

3. Able and willing to provide informed consent.

The eligibility criteria for a study eye are as follows:

Inclusion

1. Vitrectomy being performed as treatment for DME.

2. E-ETDRS visual acuity 20/800 or better (E-ETDRS visual acuity score >= 3 letters).

3. Definite retinal thickening due to diabetic macular edema based on clinical exam involving the center of the macula.

4. Presence of vitreomacular traction associated with macular edema OR edema is felt to be too diffuse to respond to focal or grid laser OR edema judged to be inadequately responsive to previous treatment(s) and unlikely to benefit from further focal photocoagulation.

5. Media clarity, pupillary dilation, and patient cooperation sufficient for adequate fundus photographs.

Exclusion

6. Macular edema is considered to be due to a cause other than diabetic macular edema.

7. An ocular condition is present such that, in the opinion of the investigator, visual acuity would not improve from resolution of macular edema (e.g., foveal atrophy, pigmentary abnormalities, subfoveal hard exudates, fibrous metaplasia, nonretinal condition).

8. An ocular condition is present (other than diabetes) that, in the opinion of the investigator, might affect macular edema or alter visual acuity during the course of the study (e.g., vein occlusion, uveitis or other ocular inflammatory disease, neovascular glaucoma, post-surgical cystoid macular edema, etc.).

9. History of retinal macular photocoagulation, intravitreal corticosteroids, or other treatment for DME within 3.5 months prior to enrollment.

10. History of peripheral scatter photocoagulation within 4 months prior to enrollment or anticipated need within the 4 months following enrollment.

11. History of prior pars plana vitrectomy.

12. History of major ocular surgery (including cataract extraction, scleral buckle, any intraocular surgery, etc.) within prior 6 months or anticipated within the next 6 months following enrollment.

13. History of YAG capsulotomy performed within 2 months prior to enrollment.

Exclusion Criteria

4. A condition that, in the opinion of the investigator, would preclude participation in the study (e.g., unstable medical status including blood pressure and glycemic control).

5. Patient is expecting to move out of the area of the clinical center to an area not covered by another clinical center during the first year of the study.

6. Blood pressure >180/110 (systolic above 180 OR diastolic above 110).

Study Eye Criteria

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

National Eye Institute (NEI)

NIH

Sponsor Role: collaborator

Jaeb Center for Health Research

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Julia A. Haller, M.D.

Role: STUDY_CHAIR

Wills Eye Institute

Locations

University of California, Irvine

Irvine, California, United States

Loma Linda University Health Care, Dept. of Ophthalmology

Loma Linda, California, United States

Southern California Desert Retina Consultants, MC

Palm Springs, California, United States

West Coast Retina Medical Group, Inc.

San Francisco, California, United States

Bay Area Retina Associates

Walnut Creek, California, United States

University of Florida College of Med., Department of Ophthalmology

Jacksonville, Florida, United States

Florida Retina Consultants

Lakeland, Florida, United States

Sarasota Retina Institute

Sarasota, Florida, United States

Center for Retina and Macular Disease

Winter Haven, Florida, United States

Retina Associates of Hawaii, Inc.

Honolulu, Hawaii, United States

Retina Consultants of Hawaii, Inc.

‘Aiea, Hawaii, United States

Raj K. Maturi, M.D., P.C.

Indianapolis, Indiana, United States

John-Kenyon American Eye Institute

New Albany, Indiana, United States

Paducah Retinal Center

Paducah, Kentucky, United States

Elman Retina Group, P.A.

Baltimore, Maryland, United States

Wilmer Eye Institute at Johns Hopkins

Baltimore, Maryland, United States

Retina Consultants of Delmarva, P.A.

Salisbury, Maryland, United States

Joslin Diabetes Center

Boston, Massachusetts, United States

Henry Ford Health System, Dept of Ophthalmology and Eye Care Services

Detroit, Michigan, United States

Vitreo-Retinal Associates

Grand Rapids, Michigan, United States

Associated Retina Consultants

Williamsburg, Michigan, United States

Retina Center, PA

Minneapolis, Minnesota, United States

University of Minnesota

Minneapolis, Minnesota, United States

Barnes Retina Institute

St Louis, Missouri, United States

Retina Consultants, PLLC

Slingerlands, New York, United States

Retina-Vitreous Surgeons of Central New York, PC

Syracuse, New York, United States

Charlotte Eye Ear Nose and Throat Assoc, PA

Charlotte, North Carolina, United States

Horizon Eye Care, PA

Charlotte, North Carolina, United States

Retina Associates of Cleveland, Inc.

Beachwood, Ohio, United States

Dean A. McGee Eye Institute

Oklahoma City, Oklahoma, United States

Retina Northwest, PC

Portland, Oregon, United States

Casey Eye Institute

Portland, Oregon, United States

Palmetto Retina Center

Columbia, South Carolina, United States

Carolina Retina Center

Columbia, South Carolina, United States

Black Hills Regional Eye Institute

Rapid City, South Dakota, United States

Southeastern Retina Associates, PC

Kingsport, Tennessee, United States

Southeastern Retina Associates, P.C.

Knoxville, Tennessee, United States

Vanderbilt University Medical Center

Nashville, Tennessee, United States

West Texas Retina Consultants P.A.

Abilene, Texas, United States

Retina Research Center

Austin, Texas, United States

Texas Retina Associates

Dallas, Texas, United States

Charles A. Garcia, PA & Associates

Houston, Texas, United States

Retina and Vitreous of Texas

Houston, Texas, United States

Texas Retina Associates

Lubbock, Texas, United States

Valley Retina Institute

McAllen, Texas, United States

Rocky Mountain Retina Consultants

Salt Lake City, Utah, United States

University of Washington Medical Center

Seattle, Washington, United States

University of Wisconsin-Madison, Dept of Ophthalmology/Retina Service

Madison, Wisconsin, United States

Countries

United States

References

Diabetic Retinopathy Clinical Research Network Writing Committee; Haller JA, Qin H, Apte RS, Beck RR, Bressler NM, Browning DJ, Danis RP, Glassman AR, Googe JM, Kollman C, Lauer AK, Peters MA, Stockman ME. Vitrectomy outcomes in eyes with diabetic macular edema and vitreomacular traction. Ophthalmology. 2010 Jun;117(6):1087-1093.e3. doi: 10.1016/j.ophtha.2009.10.040. Epub 2010 Mar 17.

Reference Type: BACKGROUND

PMID: 20299105 (View on PubMed)

Flaxel CJ, Edwards AR, Aiello LP, Arrigg PG, Beck RW, Bressler NM, Bressler SB, Ferris FL 3rd, Gupta SK, Haller JA, Lazarus HS, Qin H. Factors associated with visual acuity outcomes after vitrectomy for diabetic macular edema: diabetic retinopathy clinical research network. Retina. 2010 Oct;30(9):1488-95. doi: 10.1097/IAE.0b013e3181e7974f.

Reference Type: BACKGROUND

PMID: 20924264 (View on PubMed)

Gangaputra S, Almukhtar T, Glassman AR, Aiello LP, Bressler N, Bressler SB, Danis RP, Davis MD; Diabetic Retinopathy Clinical Research Network. Comparison of film and digital fundus photographs in eyes of individuals with diabetes mellitus. Invest Ophthalmol Vis Sci. 2011 Aug 3;52(9):6168-73. doi: 10.1167/iovs.11-7321.

Reference Type: DERIVED

PMID: 21571677 (View on PubMed)

Other Identifiers

U10EY018817-03

Identifier Type: NIH

Identifier Source: secondary_id

View Link

U10EY014229-07

Identifier Type: NIH

Identifier Source: secondary_id

View Link

U10EY014231-09

Identifier Type: NIH

Identifier Source: secondary_id

View Link

NEI-125

Identifier Type: -

Identifier Source: org_study_id