Yogurt Technique for Descemet Membrane Endothelial Keratoplasty Graft Preparation: Early Clinical Outcomes

Purpose:The aim of this study was to evaluate the efficacy and safety of the Yogurt technique for Descemet membrane endothelial keratoplasty (DMEK) graft preparation.Methods:This study included patients who underwent DMEK combined or not with phacoemulsification surgery using donor tissues prepared by a surgeon with the DMEK Tzamalis disposable punch at 2 referral hospitals between October 2019 and June 2021. Primary outcomes were duration of graft preparation, surgeon grading of graft quality, and endothelial cell density measured at 1 and 6 months after surgery. Secondary outcomes were best-corrected visual acuity (BCVA) measured at 1 and 6 months postoperatively and DMEK intraoperative and postoperative complications.Results:Forty-nine patients were included in this study. The mean DMEK graft preparation time was 7.2 +/- 1.4 minutes. Donor grafts were rated good in 67.3% of cases (33 of 49), sufficient in 24.5% (12 of 49), and poor in 8.2% (4 of 49). Donor mean endothelial cell density was 2580 +/- 155 preoperatively, which were reduced to 2269 +/- 191 (P < 0.000) and 1697 +/- 142 (P < 0.0001) at 1 and 6 months, respectively. No significant difference was found in graft preparation outcome (P = 0.543). The preoperative BCVA was 0.65 +/- 0.44 logMAR, which improved to 0.31 +/- 0.43 logMAR (P < 0.0001) and 0.12 +/- 0.14 logMAR (P < 0.0001) at 1 and 6 months after surgery, respectively.Conclusions:This study shows that the DMEK Tzamalis punch can be used as an effective and safe method for DMEK graft preparation with a shallow learning curve that allows it to be successfully performed by relatively inexperienced surgeons.

Automated summary

The purpose of this study was to evaluate the effectiveness and safety of the Yogurt technique for DMEK graft preparation. The results showed that the DMEK Tzamalis punch can be used as an effective and safe method for DMEK graft preparation, and it can be performed successfully by relatively inexperienced surgeons.