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Being Underweight Is a Well Known Factor That Predisposes REFERENCE Patients to the Development of TB [2, 3]

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Being Underweight Is a Well Known Factor That Predisposes REFERENCE Patients to the Development of TB [2, 3] Being underweight is a well known factor that predisposes REFERENCE patients to the development of TB [2, 3]. However, TB may also 1 Kim DK, Kim HJ, Kwon SY, et al. Nutritional deficit as a lead to significant wasting and debilitation [4]. In a large-scale negative prognostic factor in patients with miliary tuber- prospective TB treatment trial, being underweight at baseline culosis. Eur Respir J 2008; 32: 1031–1036. [5] and the absence of an early gain in weight during 2 Palmer CE, Jablon S, Edwards PQ. Tuberculosis morbidity chemotherapy have been associated with an increased risk of of young men in relation to tuberculin sensitivity and body relapse [6]. As high as 61% of relapsed patients in that trial build. Am Rev Tuberc 1957; 76: 517–539. occurred among those o10% underweight at diagnosis and in 3 Leung CC, Lam TH, Chan WM, et al. Lower risk of turn 62% of these occurred in those failing to gain .5% weight tuberculosis in obesity. Arch Intern Med 2007; 167: 1297–1304. in the initial phase of treatment [5, 6]. However, in the absence 4 Macallan DC. Malnutrition in tuberculosis. Diagn Mirobiol of randomised intervention targeted on nutritional status, the Infect Dis 1999; 34: 153–157. question still remains whether the weight gain associated with 5 Benator D, Bhattacharya M, Bozeman L, et al. Tuberculosis TB chemotherapy just reflects successful control of the disease, Trials Consortium. Rifapentine and isoniazid once a week or further augments the host defence against the mycobacterial versus rifampicin and isoniazid twice a week for treatment pathogen. of drug-susceptible pulmonary tuberculosis in HIV-nega- tive patients: a randomized clinical trial. Lancet 2002; 360: Miliary TB carries a very substantial degree of mortality. If poor 528–534. nutritional status does predispose patients to major complica- 6 Khan A, Sterling TR, Reves R, Vernon A, Horsburgh CR. tion(s) and death, specific intervention targeted at improving Tuberculosis Trials Consortium. Lack of weight gain and the nutritional status would be indicated to decrease the relapse risk in a large tuberculosis treatment trial. Am J associated morbidity and mortality. Unfortunately, system- Respir Crit Care Med 2006; 174: 344–348. atically collected data are notably scarce in this area. 7 Perez-Guzman C, Vargas MH, Quinonez F, Bazavilvazo N, Notwithstanding that, a cholesterol-rich diet has been shown Aguilar A. A cholesterol-rich diet accelerates bacteriologic to accelerate bacteriological sterilisation in pulmonary TB [7]. sterilization in pulmonary tuberculosis. Chest 2005; 127: Micronutrients have also been shown to decrease the risk of 643–651. reversion of sputum culture to positivity after initial conversion 8 Villamor E, Mugusi F, Urassa W, et al. A trial of the effect in the first month in both HIV-infected and noninfected patients, of micronutrient supplementation on treatment outcome, T but there was no significant effect on mortality [8]. Overall, cell counts, morbidity, and mortality in adults with micronutrients benefitted HIV-uninfected subjects the most in pulmonary tuberculosis. J Infect Dis 2008; 197: 1499–1505. that trial, whereas the opposite was the case in a previous trial in 9 Range N, Changalucha J, Krarup H, Magnussen P, the same locality [9]. Although micronutrient deficiencies often Andersen AB, Friis H. The effect of multi-vitamin/mineral occur in the midst of global nutritional deficits, neither of these supplementation on mortality during treatment of pulmonary trials contained specific information on total protein-calorie tuberculosis: a randomised two-by-two factorial trial in intake or serial measurements of body weight or body mass Mwanza, Tanzania. Br J Nutr 2006; 95: 762–770. index to allow inference to be drawn on the effect of the overall 10 Bilaceroglu S, Perim K, Buyuksirin M, Celikten E. nutritional status. Prednisolone: a beneficial and safe adjunct to anti- Systemic inflammatory responses also appear to play an tuberculous treatment? A randomized controlled trial. Int important role in the development of severe complications in J Tuberc Lung Dis 1999; 3: 47–54. tuberculosis. In the study by KIM et al. [1], an elevated DOI: 10.1183/09031936.00116108 C-reactive protein level was also shown to be an independent predictor of acute respiratory failure [1]. Poor appetite and decreased food intake may also be associated with advanced tuberculosis disease. Adjunctive corticosteroid administration To the Editors: during tuberculosis treatment has been found to afford earlier We have read with great interest the article by KIM et al. [1] on and more significant body weight gain, albeit causes no the relationship between changes in parameters reflecting differences in sputum bacteriological conversion and disease nutritional deficit, such as hypocholesterolaemia and prog- relapse rate [10]. Such a form of treatment might also merit nosis in miliary tuberculosis. We wonder if the value of reappraisal in clinical situations associated with heightened hypocholesterolaemia in predicting progression to respiratory inflammatory responses, especially when simple dietary failure and poor outcome in their patients was not exclusively manipulation does not appear to result in a significant related to malnutrition (intended as nutritional deficit), but improvement in nutrition status. was also related to more severe underlying infection. Indeed, in recent years conventional markers of malnutrition, such as C.C. Leung* and W.W. Yew# hypocholesterolaemia, have also become recognised as mar- *Tuberculosis and Chest Service, Dept of Health, and kers of inflammation and severity of illness, for instance in #Tuberculosis and Chest Unit, Grantham Hospital, Hong Kong, severe infection [2–4]. Curiously, a historical reference for this more recent concept is a 1911 article on febrile tuberculosis [5]. China. We are involved in using hypocholesterolaemia as a marker of STATEMENT OF INTEREST sepsis and severity of illness in critically ill postoperative None declared. patients. We often find that sepsis is associated with 1664 VOLUME 32 NUMBER 6 EUROPEAN RESPIRATORY JOURNAL cholesterol levels even below 1.0 mmol?L-1, independently of 4 Giovannini I, Chiarla C, Giuliante F, Vellone M, Zadak Z, the underlying nutritional state, and find that persistently Nuzzo G. Hypocholesterolemia in surgical trauma, sepsis, severe hypocholesterolaemia is associated with poor outcome other acute conditions and critical illness. In: Kramer MA, [3, 4]. ed. Trends in cholesterol research. New York, Nova Science Publishers Inc., 2005; pp. 137–161. Perhaps a more severe underlying infection might help to 5 Chauffard A, Richet C, Grigaut A. La cholesterinemia au explain, at least in part, the poor prognostic implications of cours de la tuberculose pulmonaire [Cholesterolaemia hypocholesterolaemia in tuberculosis [1]. It would be interest- during pulmonary tuberculosis]. Compt Rend Soc Biol 1911; ing to observe the correlation with the level of C-reactive 1xx: 276–277. protein. 6 Pe´rez-Guzma´n C, Vargas MH, Quin˜onez F, Bazavilvazo N, In sepsis, an unresolved issue is whether acute hypocholester- Aguilar A. A cholesterol-rich diet accelerates bacteriologic olaemia merely reflects severity of disease, or it actively sterilization in pulmonary tuberculosis. Chest 2005; 127: 643–651. contributes to poor outcome. The differences between tuber- 7 Pe´rez-Guzma´n C, Vargas MH. Hypocholesterolemia: a cular infection and surgical sepsis do not allow generalisations, major risk factor for developing pulmonary tuberculosis? however the article by KIM et al. [1] also offers an interesting Med Hypotheses 2006; 66: 1227–1230. insight into this problem. Several hypotheses support the view 8 Druml W. Is cholesterol a conditionally essential nutrient in that the low availability of cholesterol in sepsis may impair critically ill patients? Wien Klin Wochenschr 2003; 115: 740–742. adequate synthesis of stress hormones, and the adequate 9 Kipp HA. Variation in the cholesterol content of the serum synthesis and function of cells taking part in host defence [4]. in pneumonia. J Biol Chem 1920; 44: 215–237. The latter also seems to be the case with tubercular infection [6, 7] and, interestingly, oral or parenteral cholesterol supple- DOI: 10.1183/09031936.00115508 mentation has been used or proposed in both conditions [6, 8]. This aspect still deserves satisfactory assessment although, From the authors: despite the apparent modernity of the issue, a 1920 article on pneumonia patients [9] was already observing that hypo- We would like to thank C.C. Leung, D. Aggarwal, I. cholesterolaemia is a marker of the activity of infection and is Giovannini and their colleagues for their interest and impor- associated with prognosis, white blood cells and pus have a tant comments about our recent paper and for giving us the high content of cholesterol and that cholesterol might be chance to discuss the details in replying to their letters. associated with anti-toxic properties. In regards to the comment of C. Leung and W. Yew, we totally Of course, the importance of an adequate nutritional state in agree that randomised intervention targeted on nutritional tubercular infection [1] remains fundamental, independently status is essential to explain its role in the morbidity and of the interpretation of the components of hypocholesterolae- mortality in patients with tuberculosis (TB). mia, and we congratulate again the authors of the KIM et al. [1] I. Giovannini and D. Aggarwal and colleagues pointed out that
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