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Adenosine deaminase activity in rheumatoid pleural effusion
I Ocaña1, E Ribera, J M Martinez-Vázquez
1Department of Internal Medicine, Ciudad Sanitaria Valle de Hebrón, Autonomous University of Barcelona, Spain.
Annals of the Rheumatic Diseases
|May 1, 1988
Summary
Adenosine deaminase enzyme activity increases in rheumatoid pleural effusion. However, this elevation cannot distinguish rheumatoid arthritis from pleural tuberculosis due to T lymphocyte stimulation in both conditions.
Area of Science:
- Biochemistry
- Immunology
- Pulmonology
Background:
- Rheumatoid arthritis can cause pleural effusions, mimicking other conditions.
- Differentiating rheumatoid pleural effusion from infectious causes like tuberculosis is clinically important.
Purpose of the Study:
- To investigate adenosine deaminase (ADA) activity in rheumatoid pleural effusion.
- To assess the diagnostic utility of ADA levels in differentiating rheumatoid arthritis from pleural tuberculosis.
Main Methods:
- Enzyme activity assay of adenosine deaminase.
- Analysis of pleural fluid samples from patients with rheumatoid pleural effusion.
Main Results:
- Elevated adenosine deaminase activity was observed in all nine cases of rheumatoid pleural effusion.
- The ADA levels in rheumatoid pleural effusion were not significantly different from those typically seen in pleural tuberculosis.
Conclusions:
- Increased adenosine deaminase activity is characteristic of rheumatoid pleural effusion.
- Adenosine deaminase testing alone is insufficient to differentiate rheumatoid pleural effusion from pleural tuberculosis.
- The elevated ADA levels in both conditions are likely due to stimulated T lymphocytes within the pleural fluid.