Clinical Evaluation of the "Lifeline Suture" Technique for DSAEK in Cases Without Posterior Capsule Using a Novel Donor Insertion Device.

Abstract

This study investigated preliminary clinical outcomes of a suture pull-through technique for Descemet stripping automated endothelial keratoplasty (DSAEK) termed the "lifeline suture" technique using a newly developed donor inserter (NS Endo-Inserter: NSI; Hoya Co, Ltd, Tokyo, Japan) in cases of bullous keratopathy without posterior capsule. Six aphakic eyes without posterior capsule from 6 patients (mean age 73.8 ± 11.9 years) with bullous keratopathy were enrolled. DSAEK alone or as a vitreocorneal surgery was performed. Donor tissue was pulled into the anterior chamber using the NSI and a 9-0 polypropylene "lifeline suture" to prevent donor tissue from slipping into the vitreous cavity, which was removed at the end of surgery. Intraoperative and postoperative complications and 6-month postoperative central donor endothelial cell densities were measured and compared with preoperative values along with 6-month best-corrected visual acuity. All donors were successfully loaded into the NSI and then pulled into the anterior chamber using the lifeline suture. No intraoperative complications, graft dislocation, or primary graft failures were noted. Six months postsurgery, mean endothelial cell density was 2027 ± 747 cells/mm (mean loss 27.2 ± 28.1%) and mean best-corrected visual acuity improved to 0.31 decimal (P = 0.018). In this preliminary case series of bullous keratopathy without posterior capsule, DSAEK outcomes using the novel NSI donor inserter with lifeline suture were comparable or better than the results expected with conventional strategies. Thus, this technique enabled apparently safe DSAEK, preventing donor migration into the vitreous cavity while maintaining a stable anterior chamber, and is suitable for complex eyes including aphakia, lacking posterior capsule, or avitreal.