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Cryptococcal pneumonia in AIDS: is cryptococcal meningitis preceded by clinically recognizable pneumonia?
J A Driver1, C A Saunders, B Heinze-Lacey
1Evans Memorial Department of Clinical Research, Boston University Medical Center Hospital, MA 02118, USA.
Abstract:
Identification of cryptococcal infection while it is still in its pulmonary phase might improve the prognosis for patients with AIDS who contract cryptococcosis. Since cryptococcal pneumonia is infrequently diagnosed in the AIDS patient, especially compared with the frequency of diagnosis of cryptococcal meningitis, this retrospective study was designed to investigate the frequency of pulmonary complaints in the months before diagnosis of cryptococcal meningitis. The medical records of 18 patients diagnosed with cryptococcal meningitis were analyzed. Of 18 patients, 14 (78%) had respiratory symptoms during the 4-month period before meningitis appeared, as compared with nine of 18 (50%) at the time of diagnosis and four of 16 (25%) in the 4 months following diagnosis. Seven of the 14 cases of pulmonary disease prediagnosis were of unknown etiology; three were eventually diagnosed as cryptococcal infections during evaluation of the meningitis. The remaining eight infections were attributed to bacteria, respiratory viruses, or Pneumocystis carinii, although three of these cultures also contained yeast, presumed to be Candida species, which were not further examined. Our data suggest the importance of singling out AIDS patients who may have pulmonary cryptococcosis. Cryptocococcsis should be included in the differential diagnosis of pulmonary infection in HIV-positive patients with CD4+ lymphocyte counts < 200/mm3, and full identification of yeasts recovered from sputum or bronchoalveolar lavage fluid cultures should be done. A larger study should be undertaken to better define the incidence of clinically recognizable pulmonary cryptococcosis in AIDS patients.
Insights
Pulmonary symptoms are common in AIDS patients before cryptococcal meningitis diagnosis. Early identification of pulmonary cryptococcosis in HIV-positive individuals is crucial for better patient outcomes.
Area of Science:
- Infectious Diseases
- Pulmonology
- Immunology
Background:
- Cryptococcal infection in patients with Acquired Immunodeficiency Syndrome (AIDS) often presents with meningitis.
- Pulmonary cryptococcosis is frequently underdiagnosed in AIDS patients compared to cryptococcal meningitis.
- Early detection of pulmonary cryptococcosis may improve patient prognosis.
Purpose of the Study:
- To investigate the frequency of pulmonary complaints preceding the diagnosis of cryptococcal meningitis in patients with AIDS.
- To highlight the significance of pulmonary symptoms in the differential diagnosis of pulmonary infections in HIV-positive individuals.
Main Methods:
- Retrospective analysis of medical records of 18 patients diagnosed with cryptococcal meningitis.
- Review of respiratory symptoms in the 4 months before and after meningitis diagnosis.
- Examination of etiologies for prediagnosis pulmonary disease.
Main Results:
- 78% of patients (14/18) experienced respiratory symptoms in the 4 months before meningitis diagnosis.
- Pulmonary disease etiology was unknown in 7 cases; 3 were later identified as cryptococcal.
- Other pulmonary infections included bacterial, viral, and Pneumocystis carinii.
Conclusions:
- Pulmonary cryptococcosis should be considered in the differential diagnosis of pulmonary infections in HIV-positive patients with low CD4+ counts (<200/mm3).
- Full identification of yeasts from respiratory cultures is recommended.
- Further research is needed to define the incidence of clinically recognizable pulmonary cryptococcosis in AIDS patients.