Impact of respiratory viruses in hospital-acquired pneumonia in the intensive care unit: A single-center retrospective study

Paul Loubet, Guillaume Voiriot, Nadhira Houhou-Fidouh, Mathilde Neuville, Lila Bouadma, Francois-Xavier Lescure, Diane Descamps, Jean-François Timsit, Yazdan Yazdanpanah, Benoit Visseaux, Paul Loubet, Guillaume Voiriot, Nadhira Houhou-Fidouh, Mathilde Neuville, Lila Bouadma, Francois-Xavier Lescure, Diane Descamps, Jean-François Timsit, Yazdan Yazdanpanah, Benoit Visseaux

Abstract

Background: Data on the frequency and role of respiratory viruses (RVs) in hospital-acquired pneumonia (HAP) are still scarce.

Objectives: We assessed the proportion of RVs and their impact on the outcome of hospital-acquired pneumonia (HAP) in the intensive care unit (ICU).

Study design: Cases of HAP were retrospectively selected among patients who underwent screening for RVs by multiplex PCR (mPCR) in the ICU of a French tertiary care hospital from May 2014 to April 2016. ICU length of stay and in-hospital mortality were compared between four groups defined according to the identified pathogens: virus only (V), virus/bacteria (V/B), bacteria only (B) and no pathogen (Neg). When available, previous mPCR was retrieved in order to assess possible chronic viral carriage.

Results: Overall, 95/999 (10%) ICU patients who underwent mPCR had HAP (V(17,18%), V/B(13,14%), B(60,63%), Neg(5,5%)). Median age was 61 years and 45 (47%) were immunocompromised. Influenza (27%) and rhinovirus (27%) were the most common RVs. V/B group had higher mortality rate than B and V groups (62% vs. 40% and 35%, p=0.3) and a significantly longer length of stay (31days (18-48)) than V group (5days (3-11), p=0.0002)) and B group (14.5days (5.5-25.5), p=0.007)). Among the 15 patients with available mPCR tests before viral HAP, seven were negative and eight were positive corresponding to long-term carriage of community-acquired viruses.

Discussion: RVs were detected in 32% of HAP patients who underwent mPCR. Two situations were encountered: (i) acute acquired viral infection; (ii) long-term viral carriage (mostly rhinovirus) especially in immunocompromised patients complicated by a virus/bacteria coinfection. The latter was associated with a longer length of stay and a trend toward a higher mortality.

Keywords: Hospital-acquired pneumonia; Intensive care unit; Nosocomial; Pneumonia; Respiratory virus.

Copyright © 2017 Elsevier B.V. All rights reserved.

Figures

Fig. 1
Fig. 1
Distribution of respiratory viruses in patients with mPCR testing before HAP diagnosis. RV: respiratory virus, mPCR: multiplex polymerase chain reaction; VAP: ventilator-acquired pneumonia; MSSA: methicillin-sensitive Staphylococcus aureus.

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