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[Diagnostic imaging and therapeutic implications in lung infections in patients with HIV-1 infection]
E Carella1, G L Moschini, F Romanelli
1Servizio di Radiologia, Ospedale Civile, Piacenza.
Abstract:
We studied retrospectively 132 episodes of infectious pneumonias in 89 patients examined from 1990 to 1995. Pneumocystis carinii was found to be the most common cause of pneumonia (33 patients). The other causes were: Streptococcus pneumoniae (15), Mycobacterium tuberculosis (14), Pseudomonas aeruginosa (8), Staphylococcus aureus (5), Cytomegalovirus (4), Haemophilus influentiae (4), Mycobacterium avium intracellulare (2), Klebsiella pneumoniae (2), E. coli (2), Serratia marcescens (1). No etiologic agent was found in 40 cases. We stress the need of a more frequent use of invasive diagnostic procedures in the study of focal lung consolidations because this radiologic sign is highly aspecific and may be caused by too many different pathogenic agents, needing different therapies-i.e., Streptococcus pneumoniae (15 cases), Pseudomonas aeruginosa (8), Staphylococcus aureus (5), Klebsiella pneumoniae (2), Escherichia coli (2), Pneumocystis carinii, Serratia marcescens and Haemophilus influentiae (1). Since there is an increase in mortality among patients treated with empiric antibiotic therapy, we stress the need of the routinary use of bronchoalveolar lavage in HIV+ patients with lung consolidation to perform specific therapy. Moreover, Pneumocystis carinii is by far the most frequent cause of diffuse interstitial infiltrates, and PCP has very suggestive clinical (dyspnea), radiologic (diffuse perihilar interstitial infiltrates; ground glass opacities; pneumatoceles) and laboratory (CD3+CD4 < 200/mcl; LDH > 600 UI/dl; PO2 < 70 mmHg) patterns, always related to the discovery of Pneumocystis carinii in escreatum. Thus, we decided to treat 15 patients with specific therapy for Pneumocystis carinii pneumonia with the above diagnostic algorithm, obtaining in all of them complete clinical and radiologic recovery. To conclude, in critical patients, invasive procedures should be performed only in the cases in which PCP is clinically improbable.
Insights
Pneumocystis pneumonia is the leading cause of infectious pneumonia in immunocompromised patients. Early diagnosis and specific therapy, especially bronchoalveolar lavage, improve patient outcomes.
Area of Science:
- Infectious Diseases
- Pulmonology
- Critical Care Medicine
Background:
- Infectious pneumonias present a diagnostic challenge, particularly focal lung consolidations.
- Empiric antibiotic therapy can lead to increased mortality.
- Pneumocystis pneumonia (PCP) is a significant opportunistic infection in immunocompromised individuals.
Purpose of the Study:
- To retrospectively analyze the causes of infectious pneumonias in a patient cohort.
- To evaluate the utility of diagnostic procedures in identifying specific etiologies.
- To emphasize the importance of targeted therapy over empiric treatment.
Main Methods:
- Retrospective analysis of 132 pneumonia episodes in 89 patients (1990-1995).
- Review of causative agents identified through various diagnostic methods.
- Assessment of clinical, radiologic, and laboratory patterns suggestive of PCP.
Main Results:
- Pneumocystis carinii was the most common cause (33 patients), followed by Streptococcus pneumoniae (15) and Mycobacterium tuberculosis (14).
- No etiologic agent was identified in 40 cases.
- A diagnostic algorithm for PCP, including bronchoalveolar lavage, led to complete recovery in 15 treated patients.
Conclusions:
- Invasive diagnostic procedures are crucial for focal lung consolidations due to nonspecific radiologic signs.
- Routine bronchoalveolar lavage in HIV+ patients with lung consolidation is recommended for specific therapy.
- PCP diagnosis can be reliably made using clinical, radiologic, and laboratory findings, guiding specific treatment and improving outcomes.