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Annals of Intensive Care
Published in: Annals of Intensive Care 1/2017

Open Access 01-12-2017 | Research

Relation between presence of extended-spectrum β-lactamase-producing Enterobacteriaceae in systematic rectal swabs and respiratory tract specimens in ICU patients

Authors: Hélène Carbonne, Matthieu Le Dorze, Anne-Sophie Bourrel, Hélène Poupet, Claire Poyart, Emmanuelle Cambau, Jean-Paul Mira, Julien Charpentier, Rishma Amarsy

Published in: Annals of Intensive Care | Issue 1/2017

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Abstract

Background

The choice of empirical antimicrobial therapy for pneumonia in intensive care unit (ICU) is a challenge, since pneumonia is often related to multidrug-resistant pathogens, particularly extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-E). To prevent the overuse of broad-spectrum antimicrobial therapy, the main objective of this study was to test the performance of digestive colonization surveillance as a predictor of ESBL-E presence or absence in respiratory samples performed in ICU and to evaluate the impact of time sampling (≤5 days or >5 days) on such prediction. Design: Multicentric retrospective observational study, including every patient with a respiratory tract specimen positive culture and a previous rectal ESBL-E screening performed within 7 days before the respiratory sample, between January 2012 and December 2014. Results were analyzed in two groups: respiratory samples obtained during the first 5 days of ICU stay (early group) and respiratory samples obtained after 5 days (late group). Interventions: none.

Results

Among 2498 respiratory tract samples analyzed corresponding to 1503 patients, 1557 (62.3%) were performed early (≤5 days) and 941 (37.7%) later (>5 days). Positivity rates for ESBL-E were 15.0 and 36.8% for rectal swabs in the early and late groups, respectively. Sensitivity, specificity, positive (PPV) and negative (NPV) predictive values and likelihood ratios were calculated for ESBL-E digestive colonization as a predictor of ESBL-E presence in respiratory samples. PPVs of ESBL-E digestive colonization were 14.5% (95% CI [12.8; 16.3]) and 34.4% (95% CI [31.4; 37.4]), for the early and late groups, respectively, whereas NPVs were 99.2% (95% CI [98.7; 99.6]) and 93.4% (95% CI [91.9; 95.0]), respectively.

Conclusions

Systematic surveillance of ESBL-E digestive colonization may be useful to limit the use of carbapenems when pneumonia is suspected in ICU. When rectal swabs are negative, the risk of having ESBL-E in respiratory samples is very low even after 5 days of ICU stay.
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Metadata
Title
Relation between presence of extended-spectrum β-lactamase-producing Enterobacteriaceae in systematic rectal swabs and respiratory tract specimens in ICU patients
Authors
Hélène Carbonne
Matthieu Le Dorze
Anne-Sophie Bourrel
Hélène Poupet
Claire Poyart
Emmanuelle Cambau
Jean-Paul Mira
Julien Charpentier
Rishma Amarsy
Publication date
01-12-2017
Publisher
Springer Paris
Published in
Annals of Intensive Care / Issue 1/2017
Electronic ISSN: 2110-5820
DOI
https://doi.org/10.1186/s13613-017-0237-x

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