Disposable Bronchoscope Model for Simulating Endoscopic Reprocessing and Surveillance Cultures.

Area of Science:

• Infection Control
• Microbiology
• Medical Device Reprocessing

Background:

• Endoscope-associated infections persist despite adherence to reprocessing protocols.
• Microbiological testing is vital for confirming endoscope cleanliness but faces interpretation challenges.
• Disposable bronchoscopes (DBs) offer a model for studying reprocessing efficacy due to availability and processing delays.

Purpose of the Study:

• To evaluate reprocessing effectiveness of disposable bronchoscopes (DBs) under varied conditions.
• To compare high-level disinfection (HLD) versus ethylene oxide (EtO) sterilization methods.
• To assess the impact of reprocessing and soaking times on bacterial elimination.

Main Methods:

• Disposable bronchoscopes (DBs) were contaminated and incubated.
• Standard reprocessing with HLD (n=36) and EtO sterilization (n=21) were performed.
• Microbiological cultures using a "brush, flush, brush" technique assessed bacterial persistence.

Main Results:

• A final water-flush culture proved most effective in detecting residual bacteria after brushing.
• Klebsiella pneumoniae was the most frequently identified organism post-reprocessing.
• Ethylene oxide sterilization did not achieve complete eradication of viable bacteria.

Conclusions:

• Routine microbiological cultures are recommended to validate the adequacy of endoscope reprocessing.
• Effective reprocessing protocols are essential to prevent endoscope-associated infections.
• Further research into optimal reprocessing and testing methods is warranted.