Table 3.

Causes of failure and causes of NLP in Mexican children

	N	%	Notes
Causes of Failure
Loss of IOP control	24	60	Bleb fibrosis removed in 20 eyes, four received an additional AGV after second fibrosis removal failure
NLP	15	37.5	See below
AGV removal (all were implanted with a new inferotemporal AGV)	4	10	Two corneal decompensations, one valve exposed after two retinal surgeries, one tube retraction
Eviscerated	0	0	Uveitic case
Valve extrusion	1	2.5	Post-traumatic case
Retinal detachment	1	2.5
Total	40	100
Causes of NLP
Loss of IOP control	6	15	Glaucoma progression
Uncertain LP before surgery	3	7.5	Out of 11 eyes with uncertain LP before surgery (27.3%)
Retinal detachment	2	5	One post-traumatic, one Peter’s anomaly complicated 14 months after AGV during penetrating keratoplasty
Uveitis	1	2.5	Pars planitis
Retinal detachment and uveitis	1	2.5	Toxocariasis
Endophthalmitis	1	2.5	Developed at the site of the previous trabeculectomy with mitomycin C
Phthisis bulbi	1	2.5	Post-traumatic case, developed after retinal detachment surgery
Total NLP	15	100