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Prior outpatient antibiotic use as predictor for microbial aetiology of community-acquired pneumonia: hospital-based

Ewoudt M W van de Garde1, Henrik Endeman, Remco N van Hemert

  • 1Department of Clinical Pharmacy, St. Antonius Hospital, P.O. Box 2500, Nieuwegein, 3430 EM, The Netherlands, e.van.de.garde@antoniusmesosgroep.nl.

European Journal of Clinical Pharmacology
|December 7, 2007
PubMed
Abstract

Insights

Prior outpatient antimicrobial treatment can help predict the cause of community-acquired pneumonia (CAP). This finding aids in diagnosing pneumonia and selecting appropriate antimicrobial therapies for hospitalized patients.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Clinical Medicine

Background:

  • Predicting the causative pathogen in community-acquired pneumonia (CAP) is challenging.
  • Previous research explored chronic morbidity and symptoms as predictors.
  • The role of prior outpatient antimicrobial treatment in determining CAP etiology requires further investigation.

Purpose of the Study:

  • To assess if prior outpatient antimicrobial treatment predicts the microbial etiology of CAP.
  • To identify specific antimicrobial classes associated with particular pathogens.
  • To inform diagnostic workup and treatment strategies for CAP.

Main Methods:

  • Prospective observational hospital-based study (October 2004 - August 2006).
  • Included patients admitted with CAP.
  • Microbial investigations: sputum, blood culture, PCR, antigen testing, serology.
  • Outpatient antimicrobial exposure data from pharmacy records.
  • Multivariate logistic regression analysis.

Main Results:

  • 201 patients included; etiology determined in 64%.
  • Most common pathogens: Streptococcus pneumoniae, Haemophilus influenzae, Legionella spp., Mycoplasma pneumoniae, Influenza A+B.
  • 23% received prior outpatient antimicrobial treatment.
  • Beta-lactam treatment associated with increased atypical pathogens (OR 3.51) and decreased pneumococcal infection (OR 0.30).
  • Macrolide treatment increased probability of viral pneumonia.

Conclusions:

  • Prior outpatient antimicrobial therapy is a valuable predictor in diagnosing CAP etiology.
  • This information aids in planning targeted antimicrobial treatment.
  • Understanding prior treatment influences pathogen identification and patient management.

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