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A 7-year study of severe hospital-acquired pneumonia requiring ICU admission

Abstract

Objective

To examine the characteristics, prognostic factors, and outcome of patients with severe hospital-acquired pneumonia admitted to the ICU.

Design and setting

Prospective observational clinical study in two medical-surgical ICUs with 16 and 20 beds

Patients and participants

During a 7-year period all hospitalized patients requiring admission to either ICU for hospital-acquired pneumonia were followed up.

Measurements and results

We diagnosed 96 episodes of severe hospital-acquired pneumonia, and in 67 cases a causal diagnosis was made. Most episodes were late-onset pneumonia. Gram-negative micro-organisms were isolated in 51% of episodes diagnosed, and Pseudomonas aeruginosa was the most frequent pathogen isolated (24%). Clearly significant variations happened between hospitals, particularly affecting the incidence of Aspergillus spp. and Legionella pneumophila. Forty-nine patients developed septic shock (51%). Fifty-one patients died (53%). Aspergillosis and pneumonia due to P. aeruginosa were associated with the highest mortality. Septic shock (OR: 14.27) and chronic obstructive pulmonary disease (OR: 6.11) were independently associated with a poor prognosis.

Conclusions

Patients with severe hospital-acquired pneumonia admitted to the ICU present high mortality. The presence of septic shock and chronic obstructive pulmonary disease in conjunction with specific microorganisms are associated with a poor prognosis. Local epidemiological data combined with a patient-based approach may allow a more accurate therapy decision making.

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Acknowledgements

This research was supported in part by grants from Comissio Interdepartamental de Recerca i Tecnologia (CIRIT): SGR2000/128, SGR2001/414, and RED RESPIRA (RTIC C03/11).

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Correspondence to Jordi Vallés.

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Vallés, J., Mesalles, E., Mariscal, D. et al. A 7-year study of severe hospital-acquired pneumonia requiring ICU admission. Intensive Care Med 29, 1981–1988 (2003). https://doi.org/10.1007/s00134-003-2008-4

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Keywords

  • Pneumonia
  • Intensive care unit
  • Hospital-acquired infection