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[Preoperative disinfection of the conjunctiva with PVP-iodine]
Abstract:
Preoperative treatment with topically applied antibiotics does not always sufficiently reduce the bacterial flora of the conjunctival sac. Therefore, an additional disinfection procedure should be employed. Fifty-two eyes showing bacterial growth in the first conjunctical smear were treated with two drops of half-strength povidone-iodine solution (5%). Within 2 min 45 eyes showed an obvious reduction in bacteria; after an incubation time of 48 h, 26 eyes showed no bacterial growth at all. The colony counts of the remaining smears revealed a decrease factor of between 10 and 10(4). The average number of species was reduced from 2.15 to 0.63. To exclude the possibility that this was merely an irrigation effect caused by the povidone-iodine solution, 30 eyes were treated with two drops of NaCl solution and compared to the other groups. No significant decrease in colonies or species was observed. Povidone-iodine solution applied to more than 500 eyes undergoing vitreoretinal surgery caused no allergic reactions or corneal changes.
Insights
Povidone-iodine solution effectively reduces bacteria in the conjunctival sac before surgery. This disinfection method proved safe and efficient in over 500 ophthalmic procedures.
Area of Science:
- Ophthalmology
- Microbiology
- Surgical Preparation
Background:
- Topical antibiotics may not fully eliminate conjunctival sac bacteria.
- Additional disinfection is crucial for reducing preoperative bacterial load.
Purpose of the Study:
- To evaluate the efficacy of povidone-iodine solution as an additional preoperative disinfection method.
- To assess the safety of povidone-iodine in ophthalmic surgery.
Main Methods:
- Fifty-two eyes with bacterial growth underwent treatment with 5% povidone-iodine solution.
- A control group of 30 eyes received NaCl solution to rule out irrigation effects.
- Bacterial reduction was assessed by colony counts and species identification.
Main Results:
- Povidone-iodine significantly reduced bacterial presence in 45 out of 52 eyes within 2 minutes.
- 26 eyes showed complete bacterial eradication after 48 hours.
- Colony counts decreased by a factor of 10-10,000, and species count dropped from 2.15 to 0.63.
- NaCl solution showed no significant antimicrobial effect.
Conclusions:
- Half-strength povidone-iodine solution is an effective and safe adjunct for preoperative conjunctival disinfection in ophthalmic surgery.
- It significantly reduces bacterial flora without causing adverse ocular effects.