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Purpose: To evaluate the cost‐effectiveness of Descemet Membrane Endothelial Keratoplasy (DMEK) versus Ultrathin Descemet Stripping Automated Endothelial Keratoplasty (UT‐DSAEK). Methods: A cost‐effectiveness analysis using data from a multicenter randomized clinical trial was performed. The time horizon was 12 months postoperatively. Patients with Fuchs' endothelial dystrophy were randomized to DMEK (n = 29) or UT‐DSAEK (n = 24). Relevant resources from healthcare and societal perspectives were included in the cost analysis. Quality‐Adjusted Life Years (QALYs) were determined using the Health Utilities Index Mark 3 (HUI3) and the EuroQol EQ‐5D‐5L questionnaires. The main outcome was the incremental cost‐effectiveness ratio (ICER; incremental societal costs per QALY). Results: Societal costs averaged €8851 (US$11 406) for DMEK and €8320 (US$10 722) for UT‐DSAEK. Higher costs in the DMEK group were mainly caused by higher rebubbling and regraft rates (21% and 7%, vs. 4% and 0% in the UT‐DSAEK group). HUI3 QALYs were 0.70 (DMEK) and 0.79 (UT‐DSAEK). EQ‐5D‐5L QALYs were 0.83 (DMEK) and 0.86 (UT‐DSAEK). The ICER indicated DMEK was dominated by UT‐DSAEK in both analyses. The cost‐effectiveness probability for DMEK ranged from 21% to 5% (HUI3 QALYs) and 27%–14% (EQ‐5D‐5L QALYs), assuming the maximum acceptable ICER ranged from €2500 to €80.000 (US$3222–US$103 093) per QALY. Conclusion: The base case cost‐effectiveness analysis favoured UT‐DSAEK over DMEK, as costs of DMEK were higher while QALYs were lower. Further studies are required to assess long‐term rebubbling and regraft rates and graft survival. [ABSTRACT FROM AUTHOR]

Machine learning can be used to explore the complex multifactorial patterns underlying postsurgical graft detachment after endothelial corneal transplantation surgery and to evaluate the marginal effect of various practice pattern modulations. We included all posterior lamellar keratoplasty procedures recorded in the Dutch Cornea Transplant Registry from 2015 through 2018 and collected the center-specific practice patterns using a questionnaire. All available data regarding the donor, recipient, surgery, and practice pattern, were coded into 91 factors that might be associated with the occurrence of a graft detachment. In this research, we used three machine learning methods; a regularized logistic regression (lasso), classification tree analysis (CTA), and random forest classification (RFC), to select the most predictive subset of variables for graft detachment. A total of 3647 transplants were included in our analysis and the overall prevalence of graft detachment was 9.9%. In an independent test set the area under the curve for the lasso, CTA, and RFC was 0.70, 0.65, and 0.72, respectively. Identified risk factors included: a Descemet membrane endothelial keratoplasty procedure, prior graft failure, and the use of sulfur hexafluoride gas. Factors with a reduced risk included: performing combined procedures, using pre-cut donor tissue, and a pre-operative laser iridotomy. These results can help surgeons to review their practice patterns and generate hypotheses for empirical research regarding the origins of graft detachments. [ABSTRACT FROM AUTHOR]

Purpose: To compare best spectacle-corrected visual acuity (BSCVA), endothelial cell density (ECD), refractive astigmatism, and complications after Descemet membrane endothelial keratoplasty (DMEK) and ultrathin Descemet stripping automated endothelial keratoplasty (UT-DSAEK)., Design: Prospective, multicenter randomized controlled trial., Participants: Fifty-four pseudophakic eyes of 54 patients with corneal endothelial dysfunction resulting from Fuchs endothelial corneal dystrophy were enrolled in 6 corneal centers in The Netherlands., Methods: Participants were allocated to DMEK (n = 29) or UT-DSAEK (n = 25) using minimization randomization based on preoperative BSCVA, recipient central corneal thickness, gender, age, and institution. Donor corneas were prestripped and precut for DMEK and UT-DSAEK, respectively. Six corneal surgeons participated in this study., Main Outcome Measures: The primary outcome measure was BSCVA at 12 months after surgery., Results: Central graft thickness of UT-DSAEK lamellae measured 101 μm (95% confidence interval [CI], 90-112 μm). Best spectacle-corrected visual acuity did not differ significantly between DMEK and UT-DSAEK groups at 3 months (0.15 logarithm of the minimum angle of resolution [logMAR] [95% CI 0.08-0.22 logMAR] vs. 0.22 logMAR [95% CI 0.16-0.27 logMAR]; P = 0.15), 6 months (0.11 logMAR [95% CI 0.05-0.17 logMAR] vs. 0.16 logMAR [95% CI 0.12-0.21 logMAR]; P = 0.20), and 12 months (0.08 logMAR [95% CI 0.03-0.14 logMAR] vs. 0.15 logMAR [95% CI 0.10-0.19 logMAR]; P = 0.06). Twelve months after surgery, the percentage of eyes reaching 20/25 Snellen BSCVA was higher in DMEK compared with UT-DSAEK (66% vs. 33%; P = 0.02). Endothelial cell density did not differ significantly 12 months after DMEK and UT-DSAEK (1870 cells/mm 2 [95% CI 1670-2069 cells/mm 2 ] vs. 1612 cells/mm 2 [95% CI 1326-1898 cells/mm 2 ]; P = 0.12). Both techniques induced a mild hyperopic shift (12 months: +0.22 diopter [D; 95% CI -0.23 to 0.68 D] for DMEK vs. +0.58 D [95% CI 0.13-1.03 D] for UT-DSAEK; P = 0.34)., Conclusions: Descemet membrane endothelial keratoplasty and UT-DSAEK did not differ significantly in mean BSCVA, but the percentage of eyes achieving 20/25 Snellen vision was significantly higher with DMEK. Endothelial cell loss did not differ significantly between the treatment groups, and both techniques induced a minimal hyperopic shift., (Copyright © 2020 American Academy of Ophthalmology. Published by Elsevier Inc. All rights reserved.)