Related Experiment Videos
Intravitreal effects of pimaricin in experimental fungal endophthalmitis
Abstract:
Evaluation of 25, 50, and 100 mug of pimaricin given intravitreally to albino rabbits with Aspergillus endophthalmitis revealed that 25 mug of pimaricin, while nontoxic to the retina, was ineffective in inhibiting the fungal process. A dose of 50 mug was significantly more effective in inhibiting fungal disease but also caused significant retinal damage with loss of retinal function and iridoplegia. Dosages above this level resulted in vitreous retraction and degeneration, iridoplegia, and retinal detachment. Twenty-five micrograms of pimaricin given in three dosages spaced three days apart may be effective in inhibiting fungal endophthalmitis.
Insights
Pimaricin at 25 micrograms intravitreally was ineffective against Aspergillus endophthalmitis in rabbits. Higher doses caused retinal damage, but a spaced dosage regimen may prove effective.
Area of Science:
- Ophthalmology
- Mycology
- Pharmacology
Background:
- Fungal endophthalmitis, particularly Aspergillus, poses a significant threat to vision.
- Intravitreal antifungal agents are crucial for treating endogenous fungal endophthalmitis.
- Pimaricin is a potential antifungal agent, but its efficacy and safety in ocular infections require investigation.
Purpose of the Study:
- To evaluate the efficacy and safety of different intravitreal doses of pimaricin in a rabbit model of Aspergillus endophthalmitis.
- To determine the optimal dosage and administration regimen for pimaricin to treat fungal endophthalmitis while minimizing ocular toxicity.
Main Methods:
- Albino rabbits were induced with Aspergillus endophthalmitis.
- Intravitreal injections of pimaricin at doses of 25, 50, and 100 micrograms were administered.
- Ocular toxicity, retinal function, and fungal inhibition were assessed.
Main Results:
- 25 mug of pimaricin was nontoxic but ineffective against fungal growth.
- 50 mug of pimaricin demonstrated antifungal efficacy but caused significant retinal damage, including functional loss and iridoplegia.
- Doses exceeding 50 mug led to severe complications like vitreous retraction, degeneration, iridoplegia, and retinal detachment.
Conclusions:
- Single high-dose intravitreal pimaricin is associated with significant ocular toxicity.
- A lower dose of 25 micrograms of pimaricin, administered in a fractionated regimen (three doses, three days apart), may offer a safer and potentially effective treatment for fungal endophthalmitis.
- Further studies are warranted to confirm the efficacy and safety of fractionated pimaricin dosing.