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Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 2/2019

01-02-2019 | Glaucoma

Impact of ab-interno trabeculectomy on Bruch’s membrane opening-based morphometry of the optic nerve head for glaucoma progression analysis

Authors: David Kiessling, Hildegard Christ, Caroline Gietzelt, Friederike Schaub, Thomas S. Dietlein, Claus Cursiefen, Ludwig M. Heindl, Philip Enders

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 2/2019

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Abstract

Purpose

To analyze the longitudinal change in Bruch’s membrane opening minimal rim width (BMO-MRW) and circumpapillary retinal nerve fiber layer (RNFL) thickness using spectral domain optical coherence tomography (SD-OCT) after glaucoma surgery via ab-interno trabeculectomy in adult glaucoma patients.

Methods

Retrospective audit of 65 eyes of 65 participants undergoing ab-interno trabeculectomy using electroablation of the trabecular meshwork. In 53 eyes, surgery was combined with phacoemulsification and posterior chamber lens implantation. Pre- and postoperative SD-OCT examinations of the optic nerve head (ONH), intraocular pressure (IOP), and visual field data were analyzed. Longitudinal change in morphometric SD-OCT parameters of the ONH was compared and correlated to change in IOP and visual field function.

Results

BMO-MRW increased significantly between baseline (BL) and follow-up (FU) within the first 6 months after surgery (BL = 167.85 ± 90 μm; FU = 175.59 ± 89 μm; p = 0.034). This increase correlated with postoperative lowering of IOP (rho = − 0.41; p = 0.016). Nine months after surgery (range, 7–12 months), there was no significant change in BMO-MRW (BL = 196.79 ± 79; FU = 196.47 ± 85 μm; p = 0.95), while in later follow-up, a decrease of BMO-MRW was found (BL = 175.18 ± 78; FU = 168.65 ± 72; p = 0.05). RNFL thickness was unchanged in early (p > 0.16) and significantly decreased in later follow-up (p = 0.009). Mean deviation (MD) of visual field function did not show a significant change before and after surgery.

Conclusion

Electroablative ab-interno trabeculectomy leads to a significant transient mild increase in BMO-MRW. This increase was shown to correlate with IOP lowering. Significant loss of BMO-MRW in later follow-up may reflect insufficient IOP reduction by surgery. The parameters RNFL thickness and MD seem less impacted directly by surgery.
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Metadata
Title
Impact of ab-interno trabeculectomy on Bruch’s membrane opening-based morphometry of the optic nerve head for glaucoma progression analysis
Authors
David Kiessling
Hildegard Christ
Caroline Gietzelt
Friederike Schaub
Thomas S. Dietlein
Claus Cursiefen
Ludwig M. Heindl
Philip Enders
Publication date
01-02-2019
Publisher
Springer Berlin Heidelberg
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 2/2019
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-018-4187-2

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