Sheathotomy vs. Intravitreal Triamcinolone for Branch Retinal Vein Occlusion

January 25, 2008 updated by: Yonsei University

Arteriovenous Crossing Sheathotomy Versus Intravitreal Triamcinolone Acetonide Injection for Treatment of Macular Edema Associated With Branch Retinal Vein Occlusion

Branch retinal vein occlusion (BRVO) is a common retinal vascular disease occurring in a significant number of individuals older than 50 years.The most common cause of visual disturbance in BRVO patients is macular edema, which has been reported in 60% of patients. Macular grid laser photocoagulation has been shown to be effective in the treatment of macular edema arising from BRVO. Some eyes are resistant to conventional grid laser treatment, and the conventional treatment is not useful in patients with intraretinal hemorrhages that may interfere with laser photocoagulation. Moreover, several studies have shown that conventional grid laser treatment for macular edema may be associated with complications.

Intravitreal triamcinolone acetonide (IVTA) injection has recently been reported to be effective in the treatment of macular edema of various etiologies.On the other hand, arteriovenous sheathotomy is a surgical method suggested for treatment of macular edema in BRVO patients, and has been reported to be efficacious in patients refractory to conventional focal or grid laser macular photocoagulation.Both treatment modalities have been reported to be associated with reductions in central macular thicknesses and improved visual acuities.

The purpose of the study is to compare the efficacies of arteriovenous (AV) sheathotomy and intravitreal triamcinolone (IVTA) injection in the treatment of macular edema associated with branch retinal vein occlusion (BRVO).

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

40

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • recent onset (within the 6 months prior to enrollment) of macular edema resulting from BRVO
  • best corrected Early Treatment Diabetic Retinopathy Study (ETDRS) scores ≤ 40 letters (Snellen equivalent ≤ 20/40
  • intraretinal hemorrhages involving the foveal centers
  • generalized breakdown of the inner blood-retina barrier, as documented by diffuse fluorescein leakage on angiography, or diffuse thickening of the retina on optical coherence tomography (OCT), with involvement of the foveal center and most of the macular area, and with foveal thicknesses ≥ 250 micrometer

Exclusion Criteria:

  • prior history of intraocular surgery including cataract extraction
  • prior history of laser treatments including panretinal photocoagulation and focal/grid macular photocoagulation
  • prior history of elevated intraocular pressure secondary to steroid treatment
  • prior history of glaucoma or ocular hypertension
  • presence of comorbid ocular conditions that might affect visual acuity (VA).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 1
The group 1 patients receive AV sheathotomy for macular edema secondary to branch retinal vein occlusion.
Procedure: Arteriovenous Crossing Sheathotomy
In each sheathotomy patient, a standard pars plana vitrectomy is performed, followed by surgical separation of the posterior cortical vitreous from the optic nerve and posterior retina. After the relevant arteriovenous crossing site is identified based on preoperative FA, a bent microvitreoretinal blade is used to open the internal limiting membrane and the nerve fiber layer over the artery, with the incision commencing 100-200 micrometer proximal to the AV crossing. The incision is continued parallel to and under the retinal arteriole, with a gentle lifting motion, until the common AV crossing sheath is encountered and incised in a side-to-side manner. The completion of AV dissection is confirmed by an elevation of the overlying artery.
Active Comparator: 2
The group 2 patients receive IVTA.
Procedure: Intravitreal Triamcinolone Acetonide Injection
The IVTA group receive intravitreal injection of 4 mg/0.1 mL triamcinolone acetonide (40 mg/mL; Tamceton®; Hanall Pharmaceutical, Seoul, Korea). The injections are performed using 0.5% proparacaine drops (Alcaine®; Alcon Laboratories, Fort Worth, TX) for topical anesthesia under sterile conditions. The drug is injected through the inferotemporal pars plana using a 30-gauge needle. The correct intravitreal localization of the suspension, and perfusion of the optic nerve head, are then confirmed by indirect ophthalmoscopy.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
best-corrected ETDRS visual acuity score
Time Frame: baseline, at 1,3,6 months after either treatment
baseline, at 1,3,6 months after either treatment

Secondary Outcome Measures

Outcome Measure
Time Frame
complication rate
Time Frame: at 1,3,6 months after either treatment
at 1,3,6 months after either treatment

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Yonsei University

Investigators

  • Principal Investigator: Hyoung Jun Koh, MD, PhD, Yonsei University Heath System

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

October 1, 2006

Primary Completion (Actual)

August 1, 2007

Study Completion (Actual)

August 1, 2007

Study Registration Dates

First Submitted

January 25, 2008

First Submitted That Met QC Criteria

January 25, 2008

First Posted (Estimate)

February 11, 2008

Study Record Updates

Last Update Posted (Estimate)

February 11, 2008

Last Update Submitted That Met QC Criteria

January 25, 2008

Last Verified

January 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • koh003

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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