Predictors and patterns of weight gain during treatment for tuberculosis in the United States of America

Objectives: Patients with tuberculosis (TB) often present with weight loss. Lack of weight gain with TB treatment has been associated with treatment failure. The purpose of this study was to examine patterns of weight gain in patients with TB and determine the disease characteristics that predict weight gain. Methods: This was a retrospective cohort study of adults with TB treated in a county health system in the USA. Demographic, clinical, radiographic, and microbiological data were recorded in addition to monthly weights during treatment. Results: Overall, patients had a significant change in weight over the course of treatment (p < 0.0001). After 2 months of treatment, 31.9% of patients had gained at least 5% body weight; by the end of treatment, 62.4% of patients had gained at least 5% weight. Patients who gained weight did so in a linear fashion throughout treatment. Cavitary and extensive disease, a positive smear, and a positive culture were predictors of weight gain (p < 0.05). No patients had relapses during the time period of the study. Conclusions: Only a subset of patients treated for TB gain significant weight. A greater burden of disease was predictive of weight gain