The Primary Tube Versus Trabeculectomy Study. Methodology of a Multicenter Randomized Clinical Trial Comparing Tube Shunt Surgery and Trabeculectomy with Mitomycin C

Steven J Gedde, Philip P. Chen, Dale K. Heuer, Kuldev Singh, Martha M. Wright, William J Feuer, Joyce C. Schiffman, Wei Shi

Research output: Contribution to journalArticle

11 Scopus citations


Purpose: To describe the methodology of the Primary Tube Versus Trabeculectomy (PTVT) Study. Design: Multicenter randomized clinical trial. Participants: Patients with medically uncontrolled glaucoma and no prior incisional ocular surgery. Methods: Patients are being enrolled at 16 clinical centers and randomly assigned to treatment with a tube shunt (350-mm2 Baerveldt glaucoma implant) or trabeculectomy with mitomycin C (0.4 mg/ml for 2 minutes). Main Outcome Measures: The primary outcome measure is the rate of surgical failure, defined as intraocular pressure (IOP) more than 21 mmHg or reduced by less than 20% from baseline, IOP of 5 mmHg or less, reoperation for glaucoma, or loss of light perception vision. Secondary outcome measures include IOP, glaucoma medical therapy, visual acuity, visual fields, and surgical complications. Conclusions: Practice patterns vary in the surgical management of glaucoma, and opinions differ among surgeons regarding the preferred primary operation for glaucoma. The PTVT Study will provide valuable information comparing the 2 most commonly performed glaucoma surgical procedures.

Original languageEnglish (US)
StateAccepted/In press - Jan 1 2017


ASJC Scopus subject areas

  • Ophthalmology

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