Levobupivacaine hydrochloride and sufentanil have no antimicrobial effect at 25 degrees C in vitro

Area of Science:

• Anesthesiology
• Microbiology
• Pharmacology

Background:

• Levobupivacaine and sufentanil are used for labor and postoperative regional analgesia.
• The risk of bacterial contamination in these drug solutions at room temperature is not well-defined.
• Investigating the antimicrobial properties of these agents is crucial for patient safety.

Purpose of the Study:

• To evaluate the in vitro antimicrobial effect of levobupivacaine and sufentanil.
• To assess bacterial growth in solutions containing these agents against common pathogens.
• To determine the safety of using these combined solutions for extended periods at room temperature.

Main Methods:

• Standardized bacterial suspensions (Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli) were used.
• Bacterial suspensions were incubated with saline, sufentanil, levobupivacaine, or combinations at 25°C for up to 24 hours.
• Colony counts were assessed after a subsequent 24-hour incubation at 37°C.

Main Results:

• No bacterial growth was observed for any bacterial strain in any tested solution.
• This lack of growth was consistent throughout the entire experimental period.
• The results indicate inherent antimicrobial properties or lack of support for bacterial proliferation.

Conclusions:

• Solutions of levobupivacaine combined with sufentanil demonstrate no risk of bacterial growth.
• These findings suggest that the combined solutions are safe for use for up to 24 hours at room temperature during regional anesthesia.
• The study supports the clinical application of these anesthetic combinations without concerns for microbial contamination.