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Community-acquired Pseudomonas aeruginosa pneumonia in patients with HIV infection
1Division of Infectious Diseases, University of Pennsylvania Medical Center, Philadelphia.
Objective:
To describe the clinical and radiographic presentation, risk factors, response to therapy and outcome of 16 patients with HIV infection and pulmonary infections caused by Pseudomonas aeruginosa.
Design:
Retrospective review of medical records.
Setting:
An academic tertiary-care hospital.
Patients:
Sixteen patients who met the case definition were included for retrospective review.
Results:
P. aeruginosa pneumonia was community-acquired in 15 patients (94%). The majority of patients (94%) had a diagnosis of AIDS with a mean CD4 cell count of 27 x 10(6)/l cells. Traditional risk factors for the development of P. aeruginosa were missing in most patients. Cavitary infiltrates were present on admission chest radiograph in eight patients (50%). An additional three patients (19%) presented with pulmonary infiltrates that cavitated subsequently. Clinical course was extremely varied with an in-hospital mortality of only 19%, but with an additional 25% of patients developing chronic or recurrent disease.
Conclusions:
Community-acquired pneumonia caused by P. aeruginosa occurs in patients with end-stage HIV infection. The presence of cavitary pulmonary infiltrates on chest radiograph in a patient with a low CD4 count should raise suspicion of P. aeruginosa infection. Obvious risk factors for P. aeruginosa infection may be absent. While the initial mortality rate is lower than that observed in other immunocompromised hosts, the potential for chronic or recurrent infection should be recognized and patients should be followed closely.
Insights
Pseudomonas aeruginosa pneumonia is a serious concern in patients with advanced HIV infection. Early identification of cavitary infiltrates on chest X-rays is crucial for prompt diagnosis and management.
Area of Science:
- Infectious Diseases
- Pulmonology
- Immunology
Background:
- Pseudomonas aeruginosa (P. aeruginosa) is an opportunistic pathogen.
- Pulmonary infections in Human Immunodeficiency Virus (HIV) patients can be severe.
- Understanding P. aeruginosa's role in HIV-related lung disease is critical.
Purpose of the Study:
- To characterize the clinical and radiographic features of P. aeruginosa pulmonary infections in HIV-infected individuals.
- To identify risk factors, treatment responses, and outcomes in this patient population.
Main Methods:
- Retrospective review of medical records.
- Inclusion of 16 patients diagnosed with HIV and P. aeruginosa pulmonary infection.
- Analysis of clinical data, radiographic findings, and treatment outcomes.
Main Results:
- P. aeruginosa pneumonia was community-acquired in 94% of cases.
- Most patients (94%) had Acquired Immunodeficiency Syndrome (AIDS) with low CD4 counts (mean 27 x 10^6/L).
- Cavitary infiltrates were present on initial chest radiographs in 50% of patients and developed later in 19%.
Conclusions:
- P. aeruginosa pneumonia can occur in end-stage HIV infection, often community-acquired.
- Cavitary pulmonary infiltrates in HIV patients with low CD4 counts suggest P. aeruginosa infection.
- While initial mortality is relatively low, chronic or recurrent infections necessitate close patient follow-up.