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[Usefulness of microbial investigations in community-acquired pneumonia]
S Putinati1, L Trevisani, L Sighinolfi
1I Divisione di Medicina generale, Sezione di Fisiopatologia respiratoria, Ferrara.
Abstract:
Community acquired pneumonia (CAP) is a common and well known disease, however there is no definite agreement on a common diagnostic-therapeutic strategy. To evaluate the usefulness of microbial investigations in the clinical practice we performed a prospective study on 93 consecutive patients with a diagnosis of CAP. Group I consisted of 46 patients that underwent a diagnostic protocol including sputum, blood cultures and detection of specific antibodies against M. pneumoniae, adenovirus, respiratory syncytial virus, and L. pneumophila. Group II consisted of 47 patients, in which only sputum samples were collected and cultured. No significant differences concerning the aetiologic diagnosis, the outcome and the length of hospitalization were observed in the two groups. The aetiological diagnosis was obtained in 17 patients (18.3%). As result of information obtained from microbiol tests, antibiotic therapy was changed only in 6 patients. Among the prognostic factors only a low albumin level was correlated with the length of hospitalization (p less than 0.01). From our data, the detection of microbial aetiology should not be routinely performed in patients with CAP, but should be reserved only to the severe forms.
Insights
Routine microbial investigations for community-acquired pneumonia (CAP) are not beneficial. Diagnostic testing for microbial etiology should be reserved for severe CAP cases, not all patients.
Area of Science:
- Infectious Diseases
- Microbiology
- Clinical Medicine
Context:
- Community-acquired pneumonia (CAP) presents diagnostic and therapeutic challenges.
- Current strategies for diagnosing CAP lack universal agreement.
- Microbial investigations are key to understanding CAP etiology.
Purpose:
- To assess the clinical utility of comprehensive microbial investigations in CAP patients.
- To compare outcomes between patients with extensive vs. limited microbial testing.
- To determine if routine microbial testing impacts treatment or hospitalization duration.
Summary:
- A prospective study compared 93 CAP patients: Group I (extensive microbial tests) vs. Group II (sputum culture only).
- No significant differences in etiological diagnosis, outcomes, or hospitalization length were found between groups.
- Microbial etiology was identified in only 18.3% of cases, altering antibiotic therapy in just 6 patients.
Impact:
- Findings suggest routine microbial etiology detection is not cost-effective for all CAP patients.
- Microbial testing should be reserved for severe CAP cases to optimize resource allocation.
- Low albumin levels were identified as a prognostic factor for prolonged hospitalization in CAP.