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[Cellular composition of bronchopulmonary lavage fluid in pulmonary tuberculosis]
Insights
Pulmonary tuberculosis involves a lymphocytic reaction, but neutrophilic reactions increase with lung decay and bacterial load. Some patients show normal bronchoalveolar fluid, indicating no apparent lung tissue response.
Area of Science:
- Pulmonology
- Microbiology
- Immunology
Background:
- Tuberculosis (TB) is a significant global health challenge.
- Understanding the cellular immune response in active pulmonary tuberculosis is crucial for diagnosis and treatment.
- Bronchoalveolar lavage (BAL) is a key diagnostic tool for respiratory infections.
Purpose of the Study:
- To analyze the cellular composition of bronchoalveolar lavage fluid in patients with active pulmonary tuberculosis.
- To investigate the relationship between BAL fluid findings and disease severity markers.
- To identify factors influencing the host's inflammatory response in pulmonary TB.
Main Methods:
- Analysis of bronchoalveolar lavage fluids from 219 patients diagnosed with active pulmonary tuberculosis.
- Cytological examination of BAL fluid to assess cellular reactions.
- Correlation of cellular profiles with clinical and microbiological data.
Main Results:
- A predominant lymphocytic reaction was observed in pulmonary tissue, characteristic of tuberculosis and other granulomatous diseases.
- Increased neutrophilic reactions were associated with lung tissue decay, high bacterial load, and non-specific inflammation.
- In 19.2% of active pulmonary tuberculosis cases, BAL fluid cytograms were normal, suggesting no detectable lung tissue response, more frequently in males.
Conclusions:
- The cellular immune response in pulmonary tuberculosis is complex, involving both lymphocytic and neutrophilic components.
- Factors like tissue damage and bacterial burden significantly modulate the neutrophilic response.
- A subset of patients may exhibit a normal BAL fluid profile despite active disease, highlighting diagnostic challenges.
Abstract:
Bronchoalveolar lavage fluids from 219 patients with active pulmonary tuberculosis were analyzed. This may suggest that the lymphocytic reaction in the pulmonary tissue is major in tuberculosis (as in other pulmonary granulomatoses) and different factors among which there are most important ones, including lung tissue decay, bacterial abundance, concurrence of nonspecific inflammation, appear as higher rates and magnitude of neutrophilic reactions. It should be noted that in 19.2% of patients with active pulmonary tuberculosis, the bronchoalveolar fluid cytogram is normal (significantly more common in males), i.e., it shows no lung tissue response to a pathological process.