Impaired Pulmonary Nitric Oxide Bioavailability in Pulmonary Tuberculosis: Association With Disease Severity and Delayed Mycobacterial Clearance With Treatment

Anna Ralph, Tsin Yeo, Cheryl Salome, Govert Waramoi, Gysje Pontororing, Enny Kenangalem, Sandjaja, Emiliana Tjitra, R Lumb, Graeme P Maguire, Ric Price, Mark Chatfield, Paul Kelly, Nicholas Anstey

    Research output: Contribution to journalArticle

    Abstract

    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 FE NO 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. � The Author 2013.
    Original languageEnglish
    Pages (from-to)616-626
    Number of pages11
    JournalJournal of Infectious Diseases
    Volume208
    Issue number4
    DOIs
    Publication statusPublished - 2013

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