Heparin prophylaxis for intraocular fibrin

Area of Science:

• Ophthalmology
• Pharmacology
• Surgical Research

Background:

• Postoperative intraocular fibrin clot formation is a potential complication following ocular surgeries like vitrectomy.
• Effective methods to prevent or reduce fibrin clot formation are crucial for successful patient outcomes.

Purpose of the Study:

• To evaluate heparin's efficacy in preventing postoperative intraocular fibrin clot formation after vitrectomy and cyclocryotherapy in rabbits.
• To assess the impact of heparin administration via different routes on fibrin clot reduction.
• To investigate heparin's effect on intraocular bleeding following retinal vessel sectioning.

Main Methods:

• Rabbits underwent vitrectomy and cyclocryotherapy.
• Heparin was administered through various routes: anterior chamber injection, intravenous injection, subcutaneous injection, and intraocular infusion.
• Postoperative fibrin clot extent and resolution time were recorded.
• Intraocular bleeding time after retinal vessel sectioning was measured.

Main Results:

• Single anterior chamber injections, heparin-supplemented infusion solutions, and single intravenous injections significantly reduced postoperative intraocular fibrin.
• Once-daily subcutaneous injections of heparin did not significantly reduce fibrin clot formation.
• No ocular bleeding complications were observed postoperatively.
• A constant intraocular heparin infusion (10 IU/cc) did not alter bleeding time after retinal vessel sectioning.

Conclusions:

• Heparin administration via anterior chamber injection, IV injection, or as an infusion supplement is effective in minimizing postoperative intraocular fibrin clots after vitrectomy and cyclocryotherapy.
• Subcutaneous heparin injections were not effective in reducing fibrin clot formation in this model.
• Heparin did not increase intraocular bleeding complications or affect bleeding time in this study.