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Abstract #55353 Published in IGR 15-4

Changes in lamina cribrosa and prelaminar tissue after deep sclerectomy

Barrancos C; Rebolleda G; Oblanca N; Cabarga C; Muñoz-Negrete FJ
Eye 2014; 28: 58-65

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AIM: To determine the response of the lamina cribrosa (LC) and prelaminar tissue to a reduction of intraocular pressure (IOP) after nonpenetrating deep sclerectomy (NPDS) using enhanced depth imaging (EDI) spectral domain optical coherence tomography (SD-OCT). METHODS: A total of 28 eyes from 28 patients presenting with primary open angle glaucoma who underwent NPDS were studied. SD-OCT scans using EDI technology were obtained before surgery and 1 week, 1 month, and 3 months postoperatively. The OCT device was set to image a 15 × 10° vertical rectangle centred on the optic disc. The scan closest to the optic nerve head (ONH) centre was selected for analysis. The vertical distances from three equidistant points on the reference line (Bruch's membrane opening) to the anterior prelaminar tissue surface and the anterior and posterior surfaces of the LC were measured. RESULTS: The IOP decreased from 18.7 ± 4.3 to 9.1 ± 4.0 at the first week, 11.4 ± 3.7 at 1 month, and 13.1 ± 3.6 mm Hg at 3 months postoperatively (P<0.001). There was a significant reduction of the ONH cupping at 1 week (22.3%, P<0.001), 1 month (13.7%, P<0.001), and 3 months (9.8%, P=0.001) after surgery. Anterior displacement of the LC was slight but statistically significant at 1 week (4.5%, P=0.003), 1 month (3.8%, P=0.014), and 3 months postoperatively (3.3%, P=0.010). IOP reduction was significantly correlated with a reduction of ONH cupping and anterior displacement of LC at the first week and first month (P<0.05). CONCLUSIONS: Cupping reversal after NPDS is mainly due to changes in prelaminar tissue thickness, whereas the LC changes in position are less pronounced.

Full article

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Classification:

12.8.3 Non-perforating (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
2.3 Sclera (Part of: 2 Anatomical structures in glaucoma)
2.14 Optic disc (Part of: 2 Anatomical structures in glaucoma)

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