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Comparison Of Trabeculectomy Versus The Ex-PRESS Miniature Glaucoma Device In The Same Patient: A Prospective Randomized Study (XVT-USF)

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ClinicalTrials.gov Identifier: NCT00698438
Recruitment Status : Completed
First Posted : June 17, 2008
Last Update Posted : June 17, 2008
Information provided by:
University of Witwatersrand, South Africa

Brief Summary:

the purpose of this study was to compare standard trabeculectomy to the Ex-PRESS mini glaucoma shunt implantation under a scleral flap in eyes with open-angle glaucoma.In this report, we describe the results of a prospective, randomized trial in which subjects with bilateral primary open-angle glaucoma underwent the two procedures in fellow eyes.Design: Prospective, randomized clinical trial.

Participants: 15 subjects with bilateral primary open-angle glaucoma Methods: Subjects underwent the two procedures in fellow eyes. Safety and efficacy were evaluated for up to two years.

Main Outcome Measures: Mean IOP and surgical success rates. Results: Mean IOP was similar in Ex-PRESS and trabeculectomy eyes at all time points except month 9, when Ex-PRESS eyes had lower mean IOP (13.2 mmHg vs 16.5 mmHg, respectively; p=0.025). Percent IOP reduction was also similar at all time points except postoperative day 1, when trabeculectomy eyes were lower (75.5% vs 65.8%, respectively; p=0.003), likely due to a higher rate of early hypotony in trabeculectomy eyes versus Ex-PRESS eyes (47% vs 7%, respectively). Complete (without medications) and qualified (with or without medications) successes were more common at all IOP cut-off values in Ex-PRESS eyes than trabeculectomy eyes at last visit (p=0.015, p=0.015 respectively). Postoperative complications were uncommon in both groups, but trabeculectomy eyes required more postoperative interventions than Ex-PRESS eyes.

Condition or disease Intervention/treatment Phase
Glaucoma Device: Ex-PRESS implantation Procedure: Trabeculectomy Phase 4

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 30 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: Prospective, Randomized Clinical Trial,to Compare Standard Trabeculectomy to the Ex-PRESS Mini Glaucoma Shunt Implantation Under a Scleral Flap in Eyes With Open-Angle Glaucoma
Study Start Date : March 2005
Estimated Primary Completion Date : August 2007

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Eye Care Glaucoma
U.S. FDA Resources

Arm Intervention/treatment
Active Comparator: a
Implantation of Ex-PRESS mini glaucoma shunt under a scleral flap
Device: Ex-PRESS implantation

I. Mobility check of the device. II. Administration of a local or topical anesthetic. III. Preparation and coverage of the eye by conventional sterile procedures. IV. Injection of viscoelastic material into the AC through a paracenthesis. V. Creation of a scleral tunnel up to clear cornea. VI. Creation of a (5 mm) conjunctival tunnel fornix based. VII. Lifting of the conjunctiva and tenon. VIII. Formation of a 2mm scleral incision at 0.3mm depth, 1.5mm from the limbus. IX. Application of 0.5µg/ml MMC under the tunnel for one minute.

X. Penetration into the AC using a 0.65mm stiletto, inside the tunnel of the sclera-corneal junction.

XI. Implantation of the Ex-PRESSTM through that pre-incision at the sclerocorneal junction.

XII. Introducer withdrawal. XIII. Tucking the plate under the scleral tunnel, and verification of the position inside the tunnel.

XIV. Reposition the conjunctiva with 1 - 2 sutures at the limbus. XV. Closing the conjunctiva with a suture.

Other Name: a:Ex-PRESS implantation
Procedure: Trabeculectomy
standard trabeculectomy
Active Comparator: b
Procedure: Trabeculectomy
standard trabeculectomy

Primary Outcome Measures :
  1. Mean IOP and surgical success rates. na

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Subjects were at least 18 years of age and
  • Had medically uncontrolled primary open-angle glaucoma requiring incisional surgery for reduction of intraocular pressure in both eyes.
  • Subjects with prior cataract or failed filtration surgery in either eye were eligible to participate if surgery occurred at least 3 months prior to enrollment.

Exclusion Criteria:

  • Any form of glaucoma other than primary open-angle glaucoma;
  • History of or active uveitis; or
  • Any ocular abnormality that would prevent accurate assessment of intraocular pressure

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00698438

South Africa
Department of Ophthalmology, University of the Witwatersrand,
Johannesburg,, South Africa
Sponsors and Collaborators
University of Witwatersrand, South Africa

Responsible Party: Elie Dahan
ClinicalTrials.gov Identifier: NCT00698438     History of Changes
Other Study ID Numbers: XVT-USF
First Posted: June 17, 2008    Key Record Dates
Last Update Posted: June 17, 2008
Last Verified: June 2008

Keywords provided by University of Witwatersrand, South Africa:
At least 18 years of age
Open-angle glaucoma

Additional relevant MeSH terms:
Ocular Hypertension
Eye Diseases