Effectiveness of processing laryngoscopes used in surgical patients undergoing orotracheal intubation.
Luiz Miguel de Paula Moura, Adélia Dayane Guimarães Fonseca, Luciane Ribeiro and 5 others
PMID 41370609WHAT IT FOUND
Routine manual cleaning of laryngoscopes failed to remove organic residue.
Although simulated microorganisms were eliminated, all tested devices retained protein levels above safety limits, and some showed visible dirt on blades and handles.
Key findings
01All 12 laryngoscopes tested positive for protein residues after processing, with levels remaining above the acceptable limit of 1 µg/cm².
02Visual inspection revealed that 25% of the samples had alterations, specifically visible dirt on the bulbs, blades, and handles.
03The fluorescence assessment showed no solution residues in any sample, indicating the elimination of simulated microorganisms despite the failure to remove protein.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The sample size was very small, consisting of only 12 laryngoscopes, which limits the generalizability of the findings. The cleaning process was not standardized among professionals, introducing potential measurement bias. Environmental factors like temperature and humidity in the decontamination area fluctuated and were not controlled, which may have affected the cleaning efficacy.
Declared interests
The study was funded by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), a Brazilian government agency.
The easy way to misread this
Do not assume that the elimination of simulated microorganisms means the device is clean. The study found that all laryngoscopes retained protein residues above safety limits despite successful disinfection, indicating that microbial tests alone may miss organic contamination.