Evaluation of arthrocentesis site bacterial flora before and after 4 methods of preparation in horses with and without evidence of skin contamination.
Authors: Zubrod Chad J, Farnsworth Kelly D, Oaks J Lindsay
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Zubrod *et al.* investigated whether different povidone-iodine scrubbing protocols could effectively reduce bacterial contamination at arthrocentesis sites on the distal interphalangeal joint, comparing outcomes in horses housed in clean versus contaminated environments. Twenty-four horses were assigned to clean or contaminated groups, and microbial samples were cultured from preparation sites before and after one of four techniques: a 10-minute scrub, 5-minute scrub, three 30-second scrubs, or commercial one-step iodophor solution. Contaminated horses presented with significantly higher baseline bacterial loads (mean 9588 CFU/mL) than clean horses (4489 CFU/mL), yet all four preparation methods achieved remarkably similar reductions, bringing post-preparation counts to approximately 46–117 CFU/mL regardless of technique or initial contamination status. This suggests that clinicians need not adhere rigidly to prolonged scrubbing protocols—a quick three-cycle 30-second scrub or even the commercial one-step preparation proves equally effective at reducing infection risk, offering practical efficiency gains in busy practice without compromising asepsis during joint injections or fluid sampling.
Read the full abstract on PubMed
Practical Takeaways
- •Any of these four povidone-iodine preparation techniques is equally effective for arthrocentesis — choose based on time availability and convenience rather than efficacy concerns
- •Even heavily contaminated skin can be adequately prepared for sterile joint procedures; initial contamination level does not determine final safety if proper preparation is used
- •A quick one-step commercial iodophor solution performs as well as longer scrubbing protocols, potentially streamlining clinic workflow
Key Findings
- •Pre-scrub CFU counts were significantly higher in contaminated horses (9588 CFU/mL) versus clean horses (4489 CFU/mL)
- •All four povidone-iodine preparation methods reduced bacterial flora to similarly low levels (28-117 CFU/mL post-preparation)
- •No significant differences existed between preparation methods or between clean versus contaminated groups after preparation
- •All techniques achieved effective bacterial reduction regardless of initial skin contamination status