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    Cornea/External Disease

    This study examined the role of donor, recipient and operative factors in graft dislocation after Descemet stripping automated endothelial keratoplasty (DSAEK). The authors also examined the effects of graft dislocation and elevated IOP on graft success and endothelial cell density 3 years after surgery.

    Study design

    This cohort study within the multi-center, double-masked, randomized Cornea Preservation Time Study included 1,330 eyes. Recipients were randomized to a donor preservation time of 0 to 7 days or 8 to 14 days prior to undergoing DSAEK, and then followed for 3 years.

    Outcomes

    The authors demonstrated that donor diabetes (OR 2.29), operative complications (OR 2.97) and a prelamellar dissection donor corneal thickness greater than 550 microns (OR 1.13 per 25-micron increase) significantly increased the risk of graft dislocation. At 3 years, eyes with dislocated grafts had a higher risk of failure versus eyes without dislocation (hazard ratio 7.9). Elevated IOP beyond 1 month after surgery had no significant effect on graft success, whereas acute elevated IOP within the first week increased the rate of failure (HR 3.42).

    Limitations

    While an overall large study, the number of graft dislocations was still relatively small (104 eyes). Although not statistically significant, eyes with increased IOP after 1 month had an increased hazard ratio of dislocation when examining the 3-year rate of success (HR 1.81 for no prior history of glaucoma versus 2.59 for a history of glaucoma).

    Clinical significance

    This large cohort study provides further evidence of the detrimental effects of donor diabetes on DSAEK outcomes. Further investigation is needed to parse the effects of increased donor prelamellar thickness.