Toxicity of antibiotic combinations for vitrectomy infusion fluid

Area of Science:

• Ophthalmology
• Pharmacology
• Retinal Science

Background:

• Vitreous replacement fluid is used in ophthalmic surgery.
• Antibiotics are sometimes included in surgical fluids to prevent infection.
• The potential toxicity of antibiotics to sensitive retinal tissues is a critical concern.

Purpose of the Study:

• To evaluate the retinal toxicity of gentamicin when combined with other antibiotics.
• To determine the safety of using these antibiotic combinations in vitreous replacement fluid.

Main Methods:

• Antibiotic solutions including gentamicin (8 microgram/ml) with methicillin (25 microgram/ml), oxacillin (10 microgram/ml), clindamycin (10 microgram/ml), or penicillin (80 microgram/ml) were prepared.
• The non-toxicity of these combinations to retinal tissue was assessed in vitro (specific method not detailed in abstract).

Main Results:

• The combination of gentamicin with methicillin, oxacillin, clindamycin, and penicillin demonstrated no toxicity to the retina.
• Specific concentrations tested were found to be safe for ocular tissues.

Conclusions:

• Gentamicin, in combination with methicillin, oxacillin, clindamycin, and penicillin at the tested concentrations, is non-toxic to the retina.
• These antibiotic combinations may be safely incorporated into vitreous replacement fluids for ophthalmic surgical applications.