Fluids for continuous renal replacement therapy--an evaluation of microbial integrity

Area of Science:

• Microbiology
• Nephrology
• Biotechnology

Background:

• Microbial contamination is prevalent in continuous renal replacement therapy (CRRT) circuits.
• The influence of different CRRT fluids on bacterial activity remains unclear.

Purpose of the Study:

• To investigate the in vitro impact of various CRRT fluids on bacterial growth and biofilm formation.
• To compare the effects of five different CRRT fluids on seven common bacterial strains.

Main Methods:

• In vitro assessment of bacterial growth and biofilm formation in five CRRT fluids.
• Incubation of seven bacterial strains (e.g., E. coli, S. aureus, P. aeruginosa) in CRRT fluids at 22°C and 37°C for up to 72 hours.
• Spectrophotometry and microtiter plate assays were used to quantify bacterial growth and biofilm formation, respectively.

Main Results:

• Unsupplemented CRRT fluids did not support bacterial growth or biofilm formation.
• Accusol 35, Ci-Ca K2, and tri-sodium citrate demonstrated inhibitory effects on bacterial growth when supplemented with growth medium.
• No CRRT fluid completely suppressed bacterial growth across all tested organisms.

Conclusions:

• CRRT fluids exhibit varying effects on bacterial growth and biofilm development.
• All tested CRRT fluids remain vulnerable to external microbial contamination, highlighting the need for stringent aseptic techniques.