Endoscope decontamination: a comparison of the Wolf 35100 and DSD-91 systems.
The Wolf 35100 and DSD-91 endoscope disinfection machines were compared. Using a total viable count method, the degree of contamination of an Olympus GIFXQ20 endoscope was assessed following inoculation with a suspension of Pseudomonas aeruginosa and again following disinfection cycles in each machine, using 2% glutaraldehyde as the disinfectant. Both machines performed satisfactorily, with an average reduction of between 7 and 8 log10 cfu ml-1 P. aeruginosa following disinfection. The dilution effect on the glutaraldehyde of repeated disinfection cycles was also assessed for each machine. After 40 cycles in the DSD-91 and 25 cycles in the Wolf 35100 machines, the dilution of glutaraldehyde may give rise to concern, especially if adequate pre-cleaning of the endoscope is not carried out. The DSD-91 machine has certain advantages over the Wolf 35100 in terms of endoscope capacity, running costs and ease of maintenance. Both machines give similar results for endoscope disinfection.
Department of Microbiology, University College London Hospitals, UK.
G D
GD
Corcoran
J
J
Holton
G L
GL
Ridgway
D004203:Disinfection / Q000295:instrumentation* / Q000379:methods; D019723:Endoscopes; D004866:Equipment Contamination / Q000517:prevention & control*; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005976:Glutaral / Q000494:pharmacology; D006761:Hospitals; D006801:Humans; D017053:Infection Control / Q000379:methods*; D011550:Pseudomonas aeruginosa / Q000302:isolation & purification
D005976:Glutaral