5-year outcomes of single iStent (G1) trabecular microbypass implantation with phacoemulsification in moderately advanced primary open angle glaucoma

Journal article


Ansari, E. 2021. 5-year outcomes of single iStent (G1) trabecular microbypass implantation with phacoemulsification in moderately advanced primary open angle glaucoma. PLoS ONE. 16 (9), p. e0257015. https://doi.org/10.1371/journal.pone.0257015
AuthorsAnsari, E.
AbstractPurpose: To evaluate the safety and efficacy of combined phacoemulsification and single iStent (G1) (iStent, Glaukos Corp. San Clemente, USA), implantation in moderately advanced primary open angle glaucoma (POAG) with 5-years follow-up. Methods: Retrospective, interventional case series. All subjects had POAG and underwent single iStent implantation+ phaco+IOL by a single surgeon, with 5 years follow-up. Primary outcome measures: reduction in intraocular pressure (IOP) and proportion of eyes achieving at least 20% reduction of IOP at 5 years. Secondary outcome measures: number of glaucoma drops at 1 through to 5 years; change in visual field mean deviation (MD) at year 5 compared to baseline. Results: 35 eyes of 26 patients were included. Mean (sd) medicated pre-op IOP was 18.5 (3.2) mm Hg on mean (sd) 2.3 (1.0) medications. Mean IOP was reduced to 15.9 (4.5) mm Hg on 2.2 (0.9) drops, 15.0mm (4.5) mm Hg on 2.3 (0.9) drops, 15.6 (3.6) mm Hg on 2.5 (1.0) drops, 15.7 (4.43) mmHg on 2.6 (1.0) drops and 14.7 (3.02) mmHg (P<0.001) on 2.7 (1.14) drops (P = 0.06) from 1 through to 5 years. At year 5, 62% of eyes had achieved at least 20% reduction in IOP. MD reduced from -8 (8.1) dB to -10.7 (13.4) dB over 5 years (p = 0.8) at 0.54dB/ annum. One eye required filtering surgery. There were no sight-threatening complications.Conclusion: This study showed sustained IOP reduction and excellent safety profile for single iStent implantation. Uniquely it provides data for a more severe stage of glaucoma, and also visual field data, which indicated no significant change through 5 years.
KeywordsGlaucoma; Treatment
Year2021
JournalPLoS ONE
Journal citation16 (9), p. e0257015
PublisherPLoS
ISSN1932-6203
Digital Object Identifier (DOI)https://doi.org/10.1371/journal.pone.0257015
Official URLhttps://journals.plos.org/plosone/article?id=10.1371/journal.pone.0257015
Publication dates
Online16 Sep 2021
Print01 Jan 2021
Publication process dates
Accepted23 Aug 2021
Deposited22 Dec 2021
Publisher's version
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Output statusPublished
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https://repository.canterbury.ac.uk/item/8z3q1/5-year-outcomes-of-single-istent-g1-trabecular-microbypass-implantation-with-phacoemulsification-in-moderately-advanced-primary-open-angle-glaucoma

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License: CC BY 4.0

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