L-arginine and vitamin D adjunctive therapies in pulmonary tuberculosis: a randomised, double-blind, placebo-controlled trial

Ralph, Anna P., Waramori, Govert, Pontororing, Gysje J., Kenangalem, Enny, Wiguna, Andri, Tjitra, Emiliana, Sandjaja, , Lolong, Dina B., Yeo, Tsin W., Chatfield, Mark D., Soemanto, Retno K., Bastian, Ivan, Lumb, Richard, Maguire, Graeme P., Eisman, John, Price, Ric N., Morris, Peter S., Kelly, Paul M., and Anstey, Nicholas M. (2013) L-arginine and vitamin D adjunctive therapies in pulmonary tuberculosis: a randomised, double-blind, placebo-controlled trial. PLoS ONE, 8 (8). e70032. pp. 1-12.

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Abstract

Background: Vitamin D (vitD) and L-arginine have important antimycobacterial effects in humans. Adjunctive therapy with these agents has the potential to improve outcomes in active tuberculosis (TB).

Methods: In a 4-arm randomised, double-blind, placebo-controlled factorial trial in adults with smear-positive pulmonary tuberculosis (PTB) in Timika, Indonesia, we tested the effect of oral adjunctive vitD 50,000 IU 4-weekly or matching placebo, and L-arginine 6.0 g daily or matching placebo, for 8 weeks, on proportions of participants with negative 4-week sputum culture, and on an 8-week clinical score (weight, FEV1, cough, sputum, haemoptysis). All participants with available endpoints were included in analyses according to the study arm to which they were originally assigned. Adults with new smear-positive PTB were eligible. The trial was registered at ClinicalTrials.gov NCT00677339.

Results: 200 participants were enrolled, less than the intended sample size: 50 received L-arginine + active vitD, 49 received L-arginine + placebo vit D, 51 received placebo L-arginine + active vitD and 50 received placebo L-arginine + placebo vitD. According to the factorial model, 99 people received arginine, 101 placebo arginine, 101 vitamin D, 99 placebo vitamin D. Results for the primary endpoints were available in 155 (4-week culture) and 167 (clinical score) participants. Sputum culture conversion was achieved by week 4 in 48/76 (63%) participants in the active L-arginine versus 48/79 (61%) in placebo L-arginine arms (risk difference −3%, 95% CI −19 to 13%), and in 44/75 (59%) in the active vitD versus 52/80 (65%) in the placebo vitD arms (risk difference 7%, 95% CI −9 to 22%). The mean clinical outcome score also did not differ between study arms. There were no effects of the interventions on adverse event rates including hypercalcaemia, or other secondary outcomes.

Conclusion: Neither vitD nor L-arginine supplementation, at the doses administered and with the power attained, affected TB outcomes.

Item ID: 32288
Item Type: Article (Research - C1)
ISSN: 1932-6203
Additional Information:

© 2013 Ralph et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Funders: Australian Respiratory Council, Royal Australasian College of Physicians, National Health and Medical Research Council of Australia (NHMRC), Wellcome Trust
Projects and Grants: NHMRC Grant 605806, NHMRC Grant 496600
Date Deposited: 23 Apr 2014 01:37
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1117 Public Health and Health Services > 111799 Public Health and Health Services not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9299 Other Health > 929999 Health not elsewhere classified @ 100%
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