Viability of Descemet Membrane Endothelial Keratoplasty Grafts Folded in the Eye Bank

Lohmeier J, Christy J, Chiang E, Barnes K, Cai S, Chen C, Subramanya A, Chaurasia A, Rosen A, Vora P, Durr NJ, Allen R, Eghrari AO
Cornea 37 (11) 2018
https://www.sciencedirect.com/science/article/pii/S1361841518303761

Abstract

Purpose: Preloaded, trifolded grafts in Descemet membrane endothelial keratoplasty require transfer of the trifolding process from the corneal transplant surgeon to the eye bank technician. We sought to assess whether trifolding may be safely conducted by an eye bank technician with cell loss comparable to standard peeling and lifting.

Methods: A total of 10 grafts were stained, peeled, and transferred directly onto a bed of Calcein-AM and Amvisc Plus by an eye bank technician. Five grafts were removed and stained as a scroll, and 5 grafts were trifolded with the endothelium in before transfer. Photographs were acquired with an inverted fluorescence microscope, and image segmentation was performed. A t test was conducted to compare differences in endothelial cell loss across groups.

Results: Mean cell loss in the scroll group was 18.5% [95% confidence interval (CI): 15.2%–21.9%] compared with 7.6% of the trifolded group (95% CI: 1.7%–13.5%). A 2-tailed t test indicated decreased cell loss in the trifolded group (P = 0.013).

Conclusions: Despite additional manipulation of the graft, trifolding of Descemet membrane and endothelium may be performed by an eye bank technician without significantly increased cell loss relative to graft preparation as a scroll.