J Korean Soc Laryngol Phoniatr Logoped.
2024 Dec;35(3):89-93. 10.22469/jkslp.2024.35.3.89.
Evaluation of Disinfection Efficacy in Flexible Laryngoscopy According to Cidex Ortho-Phthalaldehyde Immersion Time: A Multicenter Study
- Affiliations
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- 1Department of Otolaryngology-Head and Neck Surgery, Kyung Hee University College of Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea
- 2Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Hallym University, Chuncheon Sacred Heart Hospital, Chuncheon, Korea
- 3Department of Otorhinolaryngology-Head & Neck Surgery, College of Medicine, Hallym University, Hallym Sacred Heart Hospital, Seoul, Korea
- 4Department of Otorhinolaryngology-Head & Neck Surgery, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea
- 5Department of Otorhinolaryngology-Head and Neck Surgery, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea
- 6Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Korea
- 7Department of Otolaryngology-Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
- KMID: 2562795
- DOI: http://doi.org/10.22469/jkslp.2024.35.3.89
Abstract
- Background and Objectives
Flexible laryngoscopes are indispensable tools in otolaryngology, but their frequent use makes them vulnerable to contamination, thus posing a risk of cross-infection. Unlike gastrointestinal endoscopes, flexible laryngoscopes currently lack standardized disinfection protocols. This study evaluates the efficacy of Cidex OPA (0.55% ortho-phthalaldehyde) to establish an effective, practical disinfection protocol for flexible laryngoscopes. Materials and Method This multicenter study involved the use of flexible laryngoscopes in otolaryngology outpatient clinics across five university hospitals. Laryngoscopes were immersed in Cidex OPA for 1, 5, or 12 minutes, with an additional group treated using Tristel wipes and foam after a 12-minute immersion. Swab samples were collected from the distal 15 cm of each laryngoscope following disinfection and cultured on blood agar plates under aerobic conditions at 35°C–37°C with 5% CO2 for 72 hours. Positive controls included laryngoscopes directly contaminated with saliva or laryngeal secretions.
Results
Six out of ten positive control samples demonstrated bacterial growth. However, no bacterial growth was observed in any sample from the Cidex OPA immersion groups (1, 5, or 12 minutes), including the group treated with Tristel. These findings indicate that even a 1-minute immersion in Cidex OPA effectively eliminates bacterial contamination.
Conclusion
This study provides evidence supporting an efficient disinfection method that can enhance infection control and streamline clinical workflow. Further research with a larger sample size and varied disinfection techniques is needed to establish comprehensive disinfection guidelines for flexible laryngoscopes.
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