Ahmed Glaucoma Valve Implantation, Glaucoma Eye
Conditions
Brief 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.
Detailed 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.
Interventions
PROCEDUREStandard Implantation
Traditional Ahmed plantation without vicryl ligature
PROCEDURETied off Tube
Ahmed implantation with vicryl ligature
Sponsors
American Glaucoma Society
University of Pittsburgh
Washington University School of Medicine
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
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 Angle Closure Glaucoma) or pseudoexfoliation, pigmentary and traumatic glaucoma with or without 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 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 device implantation * 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. combined tube-cataract surgery is okay) * Any abnormality other than glaucoma in the study eye that could affect tonometry.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| IOP Change | Months 1, 3 , 6, and 12 | Change IOP |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Medication Change | Months 1, 3, 6, and 12 | Change glaucoma medications |
Other
| Measure | Time frame | Description |
|---|---|---|
| Capsule Thickness as measured by anterior segment OCT | month 6 | Capsule Thickness as measured by anterior segment OCT |
| Complication Rate | Months 1, 3, 6, and 12 | Change Hypotony, Reoperations, Significant Vision Loss |
| Surgical Case Time | Post op day 0 | Decrease surgical case time |
Countries
United States
Contacts
Primary ContactAmer Al Badwai
Backup ContactEve Adcock
Outcome results
None listed