Intermediate-term Results of a Randomized Clinical Trial of the 350- versus- the 500-mm2 Baerveldt Implant

Mary Ann Lloyd, George Baerveldt, Paul S. Fellenbaum, Paul A. Sidoti, Don S. Minckler, James F. Martone, Laurie LaBree, Dale K. Heuer

Research output: Contribution to journalArticlepeer-review

160 Scopus citations


Background: The Baerveldt glaucoma implant is a large equatorial aqueous shunting device that is installed through a single-quadrant conjunctival incision. The intermediateterm results of a randomized study comparing the 350- and 500-mm2 Baerveldt implants are reported. Methods: Seventy-three patients with medically uncontrollable, nonneovascular glaucomas associated with aphakia, pseudophakia, or failed filters were enrolled in a randomized, prospective study comparing 350- and 500-mm2 Baerveldt implants. Surgical success was defined as 6 mmHg ≤ final intraocular pressure ≤ 21 mmHg without glaucoma reoperation or devastating complication. Results: Of patients with 350- and 500-mm2 implants, 93% and 88%, respectively, achieved surgical success (18-month life-table analysis, P = 0.93). The 500-mm2 implants afforded intraocular pressure control with significantly fewer medications (0.7 versus 1.3; P = 0.006). The postoperative visual acuities remained within one line of the preoperative visual acuities or improved in 62% and 66% of patients in the 350- and 500mm2 groups, respectively (P = 0.93). Complication rates were statistically similar. The most frequent ones in the 350- and 500-mm2 groups, respectively, were serous choroidal effusion (16% and 32%), strabismus (16% and 19%), anterior uveitis (14% and 11 %), and corneal or corneal graft edema (11 % each). Conclusion: The intermediate-term results of the 350- and 500-mm2 Baerveldt implants were statistically comparable with respect to surgical and visual outcomes, as well as complications, although the larger implant was associated with a higher rate of some complications. However, the 500-mm2 Baerveldt implant afforded intraocular pressure control with fewer medications than the 350-mm2 implant.

Original languageEnglish
Pages (from-to)1456-1464
Number of pages9
Issue number8
StatePublished - 1994
Externally publishedYes


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