Diabetes Endothelial Keratoplasty Study: Methods and Impact on the Use of Corneas From Donors With Diabetes for Descemet Membrane Endothelial Keratoplasty.

Purpose: Describe aims, methods, characteristics of donors, donor corneas and recipients, and potential impact of the Diabetes Endothelial Keratoplasty Study (DEKS).

Methods: The DEKS is a randomized, clinical trial to assess graft success and endothelial cell density (ECD) 1 year after Descemet membrane endothelial keratoplasty (DMEK) using corneas from donors with versus without diabetes in a 1:2 minimization assignment. Diabetes severity in the donor is assessed by medical history, postmortem HbA1c, and donor skin advanced glycation end-products and oxidation markers. A central image analysis reading center assesses baseline donor, 1-month and 1-year postoperative ECD.

Results: The DEKS used corneas from 1154 donors for 1421 DMEK procedures on 1097 participants (324 bilateral) at 28 clinical sites. Forty-eight tissue preparations failed (3%). Mean donor age was 65 years; mean eye bank-determined screening ECD was 2709 cells/mm2. Ultimately, 106 (9%) of 1154 donors without diabetes history were classified as diabetic based on postmortem HbA1c ≥6.5%, and 509 (36%) of 1421 donor lenticules were classified as coming from diabetic donors. Recipients were 58% female, 96% White, and 53% phakic. Study eyes were treated for Fuchs endothelial corneal dystrophy (96%), pseudophakic corneal edema (2%), and failed endothelial keratoplasty (2%). Mean recipient age was 70 years; 21% had diabetes history and 26 (2%) had central laboratory determined HbA1c ≥6.5% without diabetes history.

Conclusions: The DEKS will increase understanding of factors related to DMEK success while determining whether diabetes and/or diabetes severity in the donor and/or recipient adversely affects graft success and endothelial cell loss.