Abstract #82794 Published in IGR 20-4

Treatment Outcomes in the Primary Tube Versus Trabeculectomy Study after 3 Years of Follow-up

Gedde SJ; Feuer WJ; Lim KS; Barton K; Goyal S; Ahmed IIK; Brandt JD;
Ophthalmology 2020; 127: 333-345

PURPOSE: To report 3-year results of the Primary Tube Versus Trabeculectomy (PTVT) Study. DESIGN: Unmasked multicenter randomized clinical trial. PARTICIPANTS: Two hundred forty-two eyes of 242 patients with medically uncontrolled glaucoma and no previous incisional ocular surgery, including 125 in the tube group and 117 in the trabeculectomy group. METHODS: Patients were enrolled at 16 clinical centers and were assigned randomly to treatment with a tube shunt (350-mm Baerveldt glaucoma implant) or trabeculectomy with mitomycin C (MMC; 0.4 mg/ml for 2 minutes). MAIN OUTCOME MEASURES: The primary outcome measure was the rate of surgical failure, defined as intraocular pressure (IOP) of more than 21 mmHg or reduced less than 20% from baseline, IOP of 5 mmHg or less, reoperation for glaucoma, or loss of light perception vision. Secondary outcome measures included IOP, glaucoma medical therapy, visual acuity, and surgical complications. RESULTS: The cumulative probability of failure after 3 years of follow-up was 33% in the tube group and 28% in the trabeculectomy group (P = 0.17; hazard ratio, 1.39; 95% confidence interval, 0.9-2.2). Mean ± standard deviation IOP was 14.0±4.2 mmHg in the tube group and 12.1±4.8 mmHg in the trabeculectomy group at 3 years (P = 0.008), and the number of glaucoma medications was 2.1±1.4 in the tube group and 1.2±1.5 in the trabeculectomy group (P < 0.001). Serious complications requiring reoperation or producing loss of 2 or more Snellen lines developed in 3 patients (2%) in the tube group and 9 patients (8%) in the trabeculectomy group (P = 0.11). CONCLUSIONS: There was no significant difference in the rate of surgical failure between the 2 surgical procedures at 3 years. Trabeculectomy with MMC achieved lower IOP with use of fewer glaucoma medications compared with tube shunt surgery after 3 years of follow-up in the PTVT Study. Serious complications producing vision loss or requiring reoperation occurred with similar frequency after both surgical procedures.

Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, Florida. Electronic address:

Full article


12.8.2 With tube implant or other drainage devices (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
12.8.1 Without tube implant (Part of: 12 Surgical treatment > 12.8 Filtering surgery)

Issue 20-4

Select Issue