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


METHODS
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).


METHODS
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.
Service de Réanimation Chirurgicale Polyvalente, Département d'Anesthésie Réanimation SMUR, Hôpital Lariboisière, AP-HP 2, Rue Ambroise Paré, 75475, Paris Cedex 10, France. hcarbonne@gmail.com.|Service de Réanimation Médicale, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France. hcarbonne@gmail.com.
Hélène
H
Carbonne
Service de Réanimation Chirurgicale Polyvalente, Département d'Anesthésie Réanimation SMUR, Hôpital Lariboisière, AP-HP 2, Rue Ambroise Paré, 75475, Paris Cedex 10, France. matthieu.ledorze@aphp.fr.
Matthieu
M
Le Dorze
Laboratoire de Microbiologie, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
Anne-Sophie
AS
Bourrel
Laboratoire de Microbiologie, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
Hélène
H
Poupet
Laboratoire de Microbiologie, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
Claire
C
Poyart
Laboratoire de Bactériologie-Virologie, Hôpital Lariboisière, AP-HP, 2 Rue Ambroise Paré, 75475, Paris Cedex 10, France.
Emmanuelle
E
Cambau
Service de Réanimation Médicale, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
Jean-Paul
JP
Mira
Service de Réanimation Médicale, Hôpital Cochin, AP-HP, 27 rue du Faubourg Saint-Jacques, 75014, Paris, France.
Julien
J
Charpentier
Laboratoire de Bactériologie-Virologie, Hôpital Lariboisière, AP-HP, 2 Rue Ambroise Paré, 75475, Paris Cedex 10, France.|Equipe Opérationnelle d'Hygiène, Hôpital Lariboisière, AP-HP, 2 Rue Ambroise Paré, 75475, Paris Cedex 10, France.
Rishma
R
Amarsy
Digestive colonization; Enterobacteriaceae; Extended-spectrum β-lactamase; Intensive care unit; Multidrug resistance; Respiratory sample