Microbial keratitis after amniotic membrane transplantation.

Area of Science:

• Ophthalmology
• Regenerative Medicine
• Infectious Disease

Background:

• Persistent corneal epithelial defects pose a significant risk of vision loss.
• Amniotic membrane transplantation (AMT) is a therapeutic option for these defects.
• The source of amniotic tissue (commercial vs. institutional) may impact safety outcomes.

Purpose of the Study:

• To compare the incidence of early-onset and late-onset microbial keratitis after AMT for persistent corneal epithelial defects.
• To evaluate safety outcomes based on the origin of amniotic membrane grafts: commercial laboratory vs. institutional eye bank.

Main Methods:

• Retrospective, non-randomized, comparative study.
• 142 patients with persistent corneal epithelial defects underwent primary AMT between January 2003 and June 2004.
• Data collected on early-onset (<30 days) and late-onset (>30 days) microbial keratitis.

Main Results:

• No cases of early-onset microbial keratitis were observed in either the commercially prepared tissue group (72 cases) or the locally prepared tissue group (70 cases).
• The mean patient age was 50.3 years, with a mean follow-up of 6.3 months.
• No significant difference in infection rates was noted between the two tissue sources.

Conclusions:

• Amniotic membrane grafts, whether from commercial sources or institutional eye banks, can be safely used for AMT in persistent corneal epithelial defects.
• The risk of microbial keratitis within the first postoperative month is minimal with both types of amniotic tissue.
• Proper preparation by qualified personnel is crucial for ensuring the safety of amniotic tissue grafts.