Biofilms, bacteria and bladder catheters. A clinical study

Area of Science:

• Microbiology
• Infectious Diseases
• Medical Devices

Background:

• Catheter-associated urinary tract infections (CAUTIs) are a significant healthcare concern.
• Biofilm formation on indwelling medical devices, particularly urethral catheters, is a primary mechanism for persistent infections.
• Understanding biofilm dynamics on catheters is crucial for developing effective prevention strategies.

Purpose of the Study:

• To investigate the prevalence of biofilm formation on urethral catheters.
• To determine the relationship between biofilm microbial flora and bladder urine flora.
• To assess the influence of catheter material, duration of use, and prophylactic antibiotics on biofilm development.

Main Methods:

• Examination of 33 urethral catheters removed from patients.
• Microbial analysis of biofilms on catheters and corresponding bladder urine samples.
• Correlation analysis of biofilm presence with catheter material, indwelling time, and antibiotic prophylaxis.

Main Results:

• Biofilms were detected on 16 out of 33 (48.5%) examined urethral catheters.
• In 11 cases, the microbial composition of the catheter biofilm differed from that of the bladder urine.
• Biofilm formation was observed across all tested catheter materials and was not influenced by the duration the catheter was in place.
• Prophylactic antibiotics were used in 7 cases, with biofilms present on 2 of these catheters.

Conclusions:

• Biofilm formation on urethral catheters is a common occurrence.
• Catheter biofilms can harbor distinct microbial communities compared to the urinary tract.
• Current prophylactic antibiotic strategies appear to have limited efficacy in preventing catheter biofilm formation.