Precis: Argon laser peripheral iridoplasty (ALPI) was performed on 48 eyes with plateau iris syndrome (PIS). Indentation gonioscopy was used to monitor the opening of the iridocorneal angle. Mean intraocular pressure (IOP) at 5 years decreased from 15.9 to 14.4 mm Hg. None of the eyes required trabeculectomy.
Purpose: The purpose of this article was to report the long-term outcomes of ALPI for PIS.
Materials And Methods: A retrospective chart review was performed on all patients with PIS treated with ALPI from 2001 to 2012. The study included 48 eyes from 28 patients with PIS after peripheral iridotomy, with a follow-up of at least 5 years. Patients with advanced glaucoma requiring initial surgical treatment (pathologic discs and IOP above the target IOP despite medical treatment) were excluded. The primary outcomes were the effect on the number of IOP medications, and the need for complementary selective laser trabeculoplasty (SLT) or surgery (trabeculectomy and/or phacoemulsification). Secondary outcomes were optic nerve head changes and adverse events.
Results: The mean IOP statistically decreased after ALPI (15.91±2.62 vs. 14.35±2.18 mm Hg, P>0.001). The mean number of IOP-lowering medications statistically increased after ALPI (0.81±0.94 vs. 1.2±1.04, P>0.001). Mean follow-up was 92.4±26.5 months. At the end of the follow-up, 12 (25%) eyes had no medications, 20 (42%) had 1 medication, 11 (23%) had 2 medications, 3 (6%) had 3 medications, and 2 (4%) had 4. Ten (21%) eyes underwent SLT, 6 (10%) underwent phacoemulsification, and no trabeculectomy was necessary during follow-up. The change in cup to disc ratio from pre-ALPI to latest follow-up was not statistically significant, and no adverse events were reported.
Conclusions: ALPI is relatively effective and safe to prevent angle-closure glaucoma and avoid trabeculectomy in patients with PIS. This procedure often helps to control IOP, although SLT and additional medical treatments are frequently necessary to maintain the target IOP.
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