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. Author manuscript; available in PMC: 2023 Aug 1.
Published in final edited form as: Am J Ophthalmol. 2022 Mar 12;240:217–224. doi: 10.1016/j.ajo.2022.02.027

Table 2.

Reasons for Treatment Failure

Overall
Group
(n = 253)		 ABC Study AVB Study TVT Study
Ahmed
Group
(n = 57)		 Baerveldt
Group
(n = 47)		 Ahmed
Group
(n = 78)		 Baerveldt
Group
(n = 47)		 Tube
Group
(n = 24)
Inadequate IOP reduction* 135 (53) 23 (40) 17 (36) 56 (72) 26 (55) 13 (54)
Reoperation for glaucoma 68 (27) 23 (40) 8 (17) 19 (24) 11 (23) 7 (29)
Persistent hypotony† 15 (6) 1 (2) 6 (13) 0 5 (11) 3 (13)
Loss of LP vision 25 (10) 7 (12) 12 (26) 2 (3) 3 (6) 1 (4)
Removal of implant 10 (4) 3 (5) 4 (9) 1 (1) 2 (4) 0

ABC = Ahmed Baerveldt Comparison; AVB = Ahmed Versus Baerveldt; IOP = intraocular pressure; LP = light perception; TVT = Tube Versus Trabeculectomy

Data are presented as number of patients (percentage)

*

IOP > 21 mm Hg or reduced < 20% below baseline on 2 consecutive follow-up visits after 3 months

†

IOP ≥ 5 mm Hg on 2 consecutive follow-up visits after 3 months