Graft failure: I. Endothelial cell loss

Area of Science:

• Ophthalmology
• Transplantation immunology

Background:

• Endothelial cell loss is a primary cause of corneal graft failure.
• While primary graft failure is reduced, late endothelial failure remains a significant threat.
• Graft rejection can cause endothelial cell loss, but prompt treatment may limit damage.

Purpose of the Study:

• To investigate the long-term consequences of corneal transplantation on endothelial cell density.
• To understand the mechanisms and timeline of late endothelial failure.
• To evaluate the potential of novel keratoplasty techniques in preventing graft decompensation.

Main Methods:

• Analysis of endothelial cell density over extended periods post-corneal transplantation.
• Review of factors contributing to accelerated endothelial cell loss.
• Assessment of the long-term efficacy of standard and newer corneal transplantation procedures.

Main Results:

• Corneal transplantation triggers accelerated endothelial cell loss for 10-15 years, exceeding that of virgin corneas.
• Late endothelial failure, due to decreased cell density, is a major cause of graft decompensation.
• Established surgical techniques and eye banking have reduced primary graft failure rates.

Conclusions:

• Elevated donor endothelial cell density standards are crucial for long-term graft survival.
• Newer techniques like deep anterior lamellar keratoplasty and deep lamellar endothelial keratoplasty show promise but require further long-term validation.
• Understanding and mitigating late endothelial cell loss is key to improving corneal graft outcomes.