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ICU-acquired pneumonia with or without etiologic diagnosis: a comparison of outcomes

Valeria Giunta1, Miquel Ferrer, Mariano Esperatti

  • 1Servei de Pneumologia, Institut del Torax, Hospital Clinic, IDIBAPS, Universitat de Barcelona, Barcelona, Spain.

Critical Care Medicine
|July 23, 2013
PubMed
Abstract

Insights

Microbiologically unconfirmed intensive care unit-acquired pneumonia was linked to shorter antimicrobial treatment and better survival. Further research is needed to confirm pneumonia in these cases.

Area of Science:

  • Critical Care Medicine
  • Infectious Diseases
  • Pulmonology

Background:

  • Intensive care unit-acquired pneumonia (ICU-AP) is a significant concern, but the outcomes for patients without a confirmed etiological diagnosis remain unclear.
  • Understanding the impact of microbiologically unconfirmed ICU-AP is crucial for optimizing patient management and treatment strategies.

Purpose of the Study:

  • To compare the clinical characteristics, inflammatory response, and patient outcomes between ICU-acquired pneumonia cases with and without microbiologic confirmation.
  • To investigate the prognostic implications of microbiologically negative versus positive ICU-AP.

Main Methods:

  • Prospective observational study conducted in the ICUs of a university teaching hospital.
  • 270 consecutive patients with ICU-acquired pneumonia were enrolled and categorized based on microbiologic results (positive vs. negative).
  • Clinical data, inflammatory markers, and patient outcomes including mortality and survival rates were collected and analyzed.

Main Results:

  • 30% of ICU-acquired pneumonia cases lacked microbiologic confirmation.
  • Patients with negative microbiology showed distinct characteristics, including higher rates of chronic renal failure and heart disorders, less frequent prior intubation, and more severe hypoxemia.
  • Despite similar inflammatory responses, negative microbiology was associated with shorter antimicrobial treatment durations and, after adjustment, significantly better hospital survival and 90-day survival.

Conclusions:

  • Clinically suspected ICU-acquired pneumonia without microbiologic confirmation is associated with less prior intubation, reduced antimicrobial use, and improved survival outcomes.
  • The findings suggest that while these patients may have better prognoses, further studies are warranted to confirm the diagnosis and optimize management.
  • The potential influence of prior intubation on mortality requires further investigation.

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