Biofilm Formation on Central Venous Catheters: A Pilot Study

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Biomaterials Science

Background:

• Central line-associated bloodstream infections (CLABSIs) are serious complications.
• Biofilm development on central venous catheters (CVCs) is a significant factor in CLABSI pathogenesis.
• Evaluating sterilization techniques is crucial for preventing CVC biofilm formation.

Purpose of the Study:

• To assess the impact of different sterilization techniques on CVC biofilm formation.
• To compare biofilm development on CVCs prepared with chlorhexidine gluconate (CHG) alone versus CHG with a chlorhexidine gluconate-impregnated sponge (CHGIS).

Main Methods:

• Pilot study in a surgical intensive care unit.
• CVCs were prepared using CHG alone or CHG with CHGIS.
• Scanning electron microscopy and confocal laser scanning microscopy were used to analyze biofilm stages and glycocalyx presence.
• Volumetric analysis quantified biofilm and glycocalyx.

Main Results:

• Biofilms were identified on both interior and exterior surfaces of CVCs.
• Stage 4 biofilms were found on 50% of external CVC samples.
• While volumetric analysis showed increased biofilm and glycocalyx in the CHGIS group, no statistically significant difference in overall biofilm formation was observed between the two sterilization techniques.
• No positive line cultures or bacteremia were reported, though two patients in the CHGIS group had candidemia.

Conclusions:

• Both sterilization techniques resulted in biofilm formation on CVCs.
• No significant difference in CVC biofilm formation was found between CHG and CHGIS sterilization methods in this pilot study.
• Further research may be needed to fully elucidate the role of sterilization techniques in preventing CVC biofilm and subsequent infections.