Tied Tube Trial in Glaucoma Surgery

Last updated: August 26, 2024
Sponsor: Washington University School of Medicine
Overall Status: Active - Recruiting

Phase

N/A

Condition

Glaucoma

Treatment

Standard Implantation

Tied off Tube

Clinical Study ID

NCT05685485
202206072
  • Ages > 18
  • All Genders

Study Summary

The aim of this study is to assess whether delaying early flow through the Ahmed tube shunt may improve the post-operative surgical outcomes and provide a more predictable outcome. To assess this the investigator will conduct a, randomized prospective, multi-centered study with collaborators at WashU in St. Louis, Duke University, Indiana University and the University of Pittsburgh. Participants will be randomized to have an AGV placement with tube ligation (no-early flow) and without ligation (allowing for early flow). IOP will be measured at day one, week one, and months, one, three six, and twelve. Additionally, clinical data regarding number of glaucoma medications, and complications post-operative complications will also be collected.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Subjects with age at screening ≥ 18 years

  • Inadequately controlled glaucoma or ocular hypertension

  • Ahmed valve implant as the planned surgical procedure

  • Patients with primary glaucomas (Primary Open Angle Glaucoma or Primary AngleClosure Glaucoma) or pseudoexfoliation, pigmentary and traumatic glaucoma with orwithout a previous failed trabeculectomy or other intraocular surgery.

  • Primary tubes included

  • Investigators to recruit consecutively all eligible patients from their clinics.

  • Capable and willing to provide consent

Exclusion

Exclusion Criteria:

  • Subjects with NLP vision

  • Subjects unable/unwilling to provide informed consent

  • Unavailable for regular follow up

  • Previous cyclodestructive procedure

  • Prior scleral buckling procedure or other external impediment to drainage deviceimplantation

  • Presence of silicone oil

  • Vitreous in the anterior chamber sufficient to require a vitrectomy

  • Uveitic glaucoma

  • Neovascular glaucoma

  • Nanophthalmos

  • Patients with pathology that may cause elevated episcleral venous pressure

  • Procedure combined with ocular surgery other than cataract surgery (i.e. combinedtube-cataract surgery is okay)

  • Any abnormality other than glaucoma in the study eye that could affect tonometry.

Study Design

Total Participants: 152
Treatment Group(s): 2
Primary Treatment: Standard Implantation
Phase:
Study Start date:
October 18, 2022
Estimated Completion Date:
January 31, 2025

Study Description

The purpose of this study is to compare the post-operative surgical outcomes and complication rates in patients with different surgical techniques in the Ahmed FP7 glaucoma valve implant (New World Medical, Inc., Rancho Cucamonga, CA). In particular, the investigator wishes to assess whether delaying early aqueous flow by using a vicryl ligature (as done in most non-valved glaucoma drainage device implantation) will reduce the hypertensive phase, reduce early encapsulation, and optimize healing dynamics to allow for improved long term IOP results compared to standard implantation techniques.

Aggressive early aqueous flow may introduce inflammatory mediators that may increase fibrosis during wound healing. Furthermore, mechanical compression of the tissue surrounding the plate may further lead to a denser capsule and limit aqueous diffusion through Tenon's and conjunctiva. For these reasons, the investigator postulate's that the limitation of early aqueous flow through the Ahmed valve will reduce the rates of hypertensive phase, lead to a thinner and less encapsulated bleb, reduce complication rates such as hypotony, and lead to overall improvement in long-term IOP reduction.

Connect with a study center

  • Washington University

    Saint Louis, Missouri 63108
    United States

    Active - Recruiting

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