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. 2023 Dec 1;31(4):553-559.
doi: 10.53854/liim-3104-14. eCollection 2023.

Disinfectant caps in vitro effectiveness

Sara Giordana Rimoldi  1 , Leyla La Cava  2 , Chiara Palladino  3 , Mariagrazia Piacenza  3 , Stefania Vimercati  3 , Pagani Cristina  1 , Federica Salari  1 , Daniele Curreli  1 , Maria Rita Gismondo  1 , Antonella Foschi  4 , Davide Giustivi  5 , Veronica Diotto  6 , Emanuele Bizzi  7 , Maria Calloni  2 , Francesco Casella  2 , Elena Martini  2 , Mattia Donadoni  2 , Chiara Cogliati  2 , Antonio Gidaro  2
Affiliations

Disinfectant caps in vitro effectiveness

Sara Giordana Rimoldi et al. Infez Med. .

Abstract

Background: Catheter-related bloodstream infections (CRBSIs) are a major cause of morbidity and mortality among hospitalized patients. Different studies suggest that the use of disinfectant caps (DCs) significantly reduces the rate of CRBSIs. The first purpose of this study is to analyze, through an in-vitro-model, the antiseptic effect of DCs produced by two manufacturers; the second aim is to assess potential differences in terms of effectiveness between the two manufacturers' products.

Methods: A know concentration of thirteen different microorganisms was incubated with the sponge drenched in antimicrobial fluid inside DCs and cultured through several assays to investigate the disinfectant effectiveness of some commercially available caps. Disinfectant properties were evaluated under two different conditions: baseline (DCs placed on the needle-free connectors (NFCs) and stress test (DCs directly applied to the catheter hub).

Results: Both manufacturers overcame the basal tests (fourteen different assays). Regarding stress tests: the only significant bacterial load was found for Serratia marcescens (104 CFU/mL in ICU Medical™), both at 90 and 180 minutes after incubation; due to the low load, MDR Acinetobacter baumannii was not considered significant (<103 CFU/mL in BD PureHub™).

Conclusions: Our results confirm what was reported in BD PureHub™ datasheet and add data not previously shown by ICU Medical™. Moreover, no difference was observed between the two manufacturers products: the use of both DCs on NFCs was able to reclaim the catheter lumen. These findings support the routine use of DCs with NFCs, as part of a structured bundle of interventions, to reduce the incidence of CRBSIs.

Keywords: Catheter-related bloodstream infections (CRBSIs); Port Protector; disinfectant cap (DCs); in vitro model; needle-free connectors (NFCs).

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Conflict of interest statement

Conflict of interest: The Authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
A known concentration (0.5 MF) of different microorganisms was inoculated into a two-lumen catheter (A, B). At the end of bacterial growth, disinfectant caps of two main brands (BD PureHub™ and ICU Medical™) were screwed onto each catheter lumen and retained on it for ten minutes (C). After this time, we removed the filter inside the disinfectant caps (D) and cultured it for 90 and 180 minutes after incubation
See this image and copyright information in PMC

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