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A prospective randomized trial comparing manual and automated endoscope disinfection methods
V J Fraser1, G Zuckerman, R E Clouse
1Division of Infectious Disease, Washington University School of Medicine and Barnes Hospital, St. Louis, MO 63110.
Infection Control and Hospital Epidemiology
|July 1, 1993
Summary
Automated and manual endoscope disinfection showed similar contamination rates, highlighting the need for improved methods. Persistent contamination was observed in both groups, underscoring the importance of developing more effective disinfection strategies.
Area of Science:
- Infection control
- Medical device reprocessing
- Microbiology
Background:
- Endoscope reprocessing is critical for preventing healthcare-associated infections.
- Current disinfection methods include automated and manual systems, with varying reported efficacies.
Purpose of the Study:
- To compare the effectiveness of automated versus manual endoscope disinfection systems.
- To identify microbial contamination rates after different disinfection protocols.
Main Methods:
- A prospective randomized trial was conducted at a tertiary care center.
- Endoscopes underwent a three-stage decontamination process: cleaning, manual or automated disinfection with 2% glutaraldehyde, and alcohol rinse with air drying.
- Microbial cultures were obtained before and after disinfection and rinsing, and after overnight storage.
Main Results:
- No statistically significant difference in contamination rates was found between automated and manual disinfection methods.
- Gram-negative bacteria and nontuberculous mycobacteria were common contaminants.
- Colonoscopes and duodenoscopes showed higher contamination rates than gastroscopes.
Conclusions:
- Persistent endoscope contamination suggests current manual and automated disinfection methods may be insufficient.
- Development of more reliable and effective endoscope disinfection strategies is warranted.