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Nitroblue tetrazolium test in pulmonary thromboembolism and pneumonia
Abstract:
The histochemical nitroblue tetrazolium (NBT) test was performed in 88 patients with acute pulmonary thromboembolism or lobar pneumonia and in 88 healthy control subjects. In the control group, the mean NBT score was 5.4%. In the group of 55 patients with pulmonary thromboembolism the mean NBT score was 6.5% which is insignificantly different from the control mean. Only 3 of these patients had scores above normal. 35 embolism patients were followed by repeated examinations for 1 week after admission. The NBT scores remained within normal limits. 29 of the 33 patients with lobar pneumonia had elevated scores, and the mean NBT score was 33.5%. Endotoxin stimulated NBT test disclosed normal enhancement of NBT reduction by neutrophils from patients in either group as well as controls. The NBT test is of value in the differential diagnosis of pulmonary infection and thromboembolic disease. However, the results should be interpreted in the light of other pertinent laboratory and clinical findings.
Insights
The nitroblue tetrazolium (NBT) test can help differentiate pulmonary infections from thromboembolic disease. Elevated NBT scores were observed in lobar pneumonia patients, but not in those with pulmonary thromboembolism.
Area of Science:
- Clinical Medicine
- Immunology
Background:
- The nitroblue tetrazolium (NBT) test is a histochemical assay used to assess neutrophil function.
- Differentiating between pulmonary infection and thromboembolic disease can be clinically challenging.
Purpose of the Study:
- To evaluate the diagnostic utility of the NBT test in distinguishing acute pulmonary thromboembolism from lobar pneumonia.
Main Methods:
- The NBT test was conducted on 88 patients with acute pulmonary thromboembolism or lobar pneumonia and 88 healthy controls.
- Neutrophil NBT reduction was assessed, including endotoxin-stimulated tests.
Main Results:
- Patients with lobar pneumonia showed significantly elevated mean NBT scores (33.5%) compared to controls (5.4%).
- Patients with pulmonary thromboembolism had mean NBT scores (6.5%) not significantly different from controls.
- NBT scores remained normal in pulmonary thromboembolism patients during a one-week follow-up.
Conclusions:
- The NBT test is valuable for the differential diagnosis of pulmonary infection versus thromboembolic disease.
- Elevated NBT scores are indicative of lobar pneumonia, while normal scores are typical for pulmonary thromboembolism.
- Clinical and laboratory findings should be considered alongside NBT test results for accurate interpretation.