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Open AccessArticle

Using Microbiological Sampling to Evaluate the Efficacy of Nasofibroscope Disinfection: The Tristel Trio Wipes System in Ear–Nose–Throat (ENT) Endoscopy

1
Department of Public Health and Pediatrics, University of Turin, 10126 Turin, Italy
2
Laboratory of Microbiology and Virology, Città della Salute e della Scienza Hospital, 10126 Turin, Italy
3
Department of Public Health and Pediatrics, University of Turin, Laboratory of Microbiology and Virology, Città della Salute e della Scienza Hospital, 10126 Turin, Italy
4
Department of Surgical Sciences, Otolaryngology Unit, University of Turin, 10126 Turin, Italy
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(22), 4583; https://doi.org/10.3390/ijerph16224583
Received: 24 October 2019 / Revised: 15 November 2019 / Accepted: 15 November 2019 / Published: 19 November 2019
Disinfection and sterilization are needed for guaranteeing that medical and surgical instruments do not spread contagious microorganisms to patients. The aim of this study was to evaluate the efficacy of a simple manual technique of high-level disinfection (HLD) of flexible fiberoptic nasofibroscopes (FFNs) with wipes impregnated with a chlorine dioxide solution (Tristel Trio Wipes System—TTW) against a conventional automated washer machine (Soluscope ENT, Cimrex 12—AW). FFNs used in 62 patients undergoing endoscopy at an ENT clinic were sampled according to an aseptic procedure. For each nasoendoscopy, microbiological samples were taken at two times: (1) after a patient’s nasoendoscopy and (2) immediately after high-level disinfection. Ten microliters of each prepared sample were inoculated onto specific culture media for the detection of nasopharyngeal flora microorganisms. The microbiological results obtained from 62 post-disinfection samples revealed bacterial growth on two FFNs disinfected with AW, and five FFNs disinfected with TTW, but this difference is not statistically significant. None of the isolates were pathogenic bacteria. Our results are different than the results obtained by two previously published studies on the TTW system. In both studies, sampling was carried out by swabbing the tip and the handle surface of FFNs. This sampling method was the least effective method means of detecting bacteria on a surface. It can be concluded that the two disinfection systems allow providers to obtain a reduction of the saprophytic and pathogenic microbial load. View Full-Text
Keywords: flexible fiberoptic laryngoscope; disinfection; sampling; wipes flexible fiberoptic laryngoscope; disinfection; sampling; wipes
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Ditommaso, S.; Giacomuzzi, M.; Cipriani, R.; Zaccaria, T.; Cavallo, R.; Boggio, V.; Albera, R.; Zotti, C.M. Using Microbiological Sampling to Evaluate the Efficacy of Nasofibroscope Disinfection: The Tristel Trio Wipes System in Ear–Nose–Throat (ENT) Endoscopy. Int. J. Environ. Res. Public Health 2019, 16, 4583.

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