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Mycobacteria and glutaraldehydeis high level disinfection of endoscopes possible

2011-2-18 15:46:47119

BACKGROUND: potassium phosphiteHigh-level disinfection of endoscopes has traditionally been undertaken by manual or automatic scope cleaning plus a 10 to 20 minute soak in 2% alkaline glutaraldehyde. Qualitative studies of the external endoscope surface as well as monopotassium phosphitethe air-water valve showed no detectable organisms after a 10-minute exposure to alkaline glutaraldehyde. Conventional quantitative culture techniques of the channels demonstrated one endoscope out of five with consistent growth after a 10-minute exposure to glutaraldehyde. Following alcohol treatment, there was no significant colony growth. monopotassium phosphite In contrast, a quantitative membrane filter system showed the presence of at least one mycobacterial colony in four out of five scopes after a 45-minute glutaraldehyde exposure. CONCLUSIONS: Additional studies utilizing a standardized mycobacterial species, inoculum size, and suspension characteristics are recommended to delineate adequate duration of disinfectant exposure time.Mycobacteria species are less sensitive to glutaraldehyde, and a 45-minutepotassium phosphite instrument soak has recently been recommended by the manufacturer. Because of concerns over endoscope damage, need for more endoscopes, and perception that the current cleaning method is adequate, we prospectively studied mycobacteria-contaminated endoscopes at various stages of the cleaning process. METHODS: All work was done under a laminar flow hood in a microbiology laboratory. Five gastrointestinal scopes were contaminated with 10(8) colony forming units per milliliter (CFU/mL) of Mycobacteriumpotassium phosphite chelonei, an atypical mycobacterium similar in chemical resistance to Mycobacterium tuberculosis but with less infectious potential. Cultures of the sheath, biopsy channel, and elevator channel were taken at baseline, after manual cleaning, and after 10, 20, and 45 minutes to glutaraldehyde soak both before and after alcohol rinse. RESULTS: Manual cleaningmonopotassium phosphite resulted in a mean of 4.7 log10 reduction in viable mycobacterial colonies.

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