期刊
JOURNAL OF INFECTIOUS DISEASES
卷 208, 期 4, 页码 616-626出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/infdis/jit248
关键词
tuberculosis; exhaled nitric oxide; L-arginine; M2 macrophages; biomarker
资金
- National Health and Medical Research Council of Australia [605806, 496600]
- Australian Respiratory Council
- Royal Australasian College of Physicians Covance Award
- Wellcome Trust
- Margaret Ross Chair in Indigenous Health
Background. Nitric oxide (NO), a key macrophage antimycobacterial mediator that ameliorates immunopathology, is measurable in exhaled breath in individuals with pulmonary tuberculosis. We investigated relationships between fractional exhale NO (FENO) and initial pulmonary tuberculosis severity, change during treatment, and relationship with conversion of sputum culture to negative at 2 months. Methods. In Papua, we measured FENO in patients with pulmonary tuberculosis at baseline and serially over 6 months and once in healthy controls. Treatment outcomes were conversion of sputum culture results at 2 months and time to conversion of sputum microscopy results. Results. Among 200 patients with pulmonary tuberculosis and 88 controls, FENO was lower for patients with pulmonary tuberculosis at diagnosis (geometric mean FENO, 12.7 parts per billion [ppb]; 95% confidence interval [CI], 11.6-13.8) than for controls (geometric mean FENO, 16.6 ppb; 95% CI, 14.2-19.5; P=.002),fell further after treatment initiation (nadir at 1 week), and then recovered by 6 months (P=.03). Lower FENO was associated with more-severe tuberculosis disease, with FENO directly proportional to weight (P<.001) and forced vital-capacity (P=.001) and inversely proportional to radiological score (P=.03). People whose FENO increased or remained unchanged by 2 months were 2.7-fold more likely to achieve conversion of sputum culture than those whose FENO decreased (odds ratio, 2.72; 95% CI, 1.05-7.12; P=.04). Conclusions. Among patients with pulmonary tuberculosis, impaired pulmonary NO bioavailability is associated with more-severe disease and delayed mycobacterial clearance. Measures to increase pulmonary NO warrant investigation as adjunctive tuberculosis treatments.
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