In vitro bacteriological evaluation of the effectiveness of antimicrobial irrigating solutions

Area of Science:

• Microbiology
• Infectious Diseases
• Surgical Infections

Background:

• Postoperative infections remain a significant concern in surgical outcomes.
• Contamination of surgical wounds with pathogenic bacteria can lead to infection.
• Effective antimicrobial strategies are crucial for preventing surgical site infections.

Purpose of the Study:

• To evaluate the in vitro efficacy of antimicrobial solutions, including polyvinyl povidone iodine, against pathogenic aerobic bacteria.
• To determine the impact of human plasma on bacterial sensitivity to antibiotics and antimicrobial solutions.
• To assess the potential of antimicrobial wound irrigation in reducing postoperative infection rates.

Main Methods:

• Nineteen strains of pathogenic aerobic bacteria were exposed in vitro for 15 seconds to varying concentrations of five antibiotics and polyvinyl povidone iodine in saline.
• The effect of 30% human plasma on bacterial sensitivity was assessed.
• Bacterial sensitivity was compared to standard disc sensitivity tests.

Main Results:

• Most bacteria were sensitive to the antimicrobial solutions within the brief 15-second exposure period.
• Human plasma did not alter bacterial sensitivity to the tested antibiotics.
• Polyvinyl povidone iodine demonstrated sterilization capabilities at concentrations as low as 25%.

Conclusions:

• Antimicrobial solutions, particularly polyvinyl povidone iodine, show significant bactericidal activity in vitro.
• The findings support the hypothesis that wound irrigation with appropriate antimicrobial solutions may decrease postoperative infection rates.
• Targeting surface bacterial contamination during surgery with effective irrigants is a promising approach for infection control.