ArticleCureus2026
Clinical and Imaging Outcomes of the Upside‑Down Pars Plana Ahmed Glaucoma Valve Implantation: A Follow‑Up to Our Initial Report.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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4 authors.
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Abstract
introductionTube shunts are essential for refractory glaucoma, yet plate encapsulation can compromise long-term efficacy. We evaluated long-term clinical and imaging outcomes of an "upside-down" Ahmed glaucoma valve (AGV) technique via the pars plana, which may favorably modify bleb architecture.
methodsThis retrospective observational study included 10 eyes from 10 patients who underwent pars plana AGV implantation with the valve plate flipped upside down to direct the drainage port toward the scleral surface. Outcomes included intraocular pressure (IOP), glaucoma medication score, postoperative complications, and corneal endothelial cell density (ECD). Orbital magnetic resonance imaging (MRI) was performed in two eyes to assess bleb morphology.
resultsMean follow-up was 45.9 ± 24.2 months. Mean preoperative IOP decreased from 35.8 ± 4.4 to 14.9 ± 0.6 mmHg at 66 months (p < 0.05). The glaucoma medication score decreased from 4.6 ± 0.7 to 2.4 ± 0.5 at 42 months (p < 0.05). Transient postoperative hypertension occurred in seven eyes and resolved without surgical intervention. Three patients lost light perception due to retinal ischemia related to the underlying disease. No persistent hypotony or tube exposure was observed. Orbital MRI obtained at approximately six years postoperatively demonstrated preservation of a double-layered peri-endplate bleb configuration in two eyes. The average monthly ECD loss rate was 0.28% ± 0.26%.
conclusionsThe upside-down pars plana AGV technique achieved sustained IOP reduction through 66 months and suggested stable long-term bleb morphology on MRI without adjunctive antifibrotic agents. This approach may be a useful option for complex refractory glaucoma.
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