Zinc supplementation in children and adolescents with acute leukemia.

BACKGROUND/OBJECTIVES: Zinc is known as an essential micronutrient for human health because of its structural and biochemical functions, influencing growth and affecting multiple aspects of the immune system. Zinc has been extensively studied in neoplastic processes but its role in children with leukemia still remains to be elucidated in several aspects. The aim of this study was to evaluate the effects of oral zinc supplementation on weight gain and infectious episodes in children and adolescents with acute leukemia. SUBJECTS/METHODS: This study included 38 patients, and was carried out as a randomized, double-blind, placebo-controlled investigation. The dosage of plasma zinc levels and the evaluation of nutritional status were performed during a period of 60 days. Zinc was supplemented orally, 2 mg/kg/day, in the form of amino acid salt. RESULTS: The results showed that plasma zinc concentrations did not increase significantly with the addition of the micronutrient. However, from a clinical point of view, it has become evident that supplementary zinc exerts a positive effect on nutritional status as positive weight gain. Moreover, the number of infection episodes was significantly reduced, possibly because of the immune stimuli. CONCLUSIONS: In conclusion, zinc supplementation can prevent some of the chemotherapy adverse effects in children with leukemia, improving their quality of life.

Treatment of visceral leishmaniasis in children in the Central-West Region of Brazil.

BACKGROUND: Detailed reports on the treatment of visceral leishmaniasis (VL) are scarce, particularly with regard to the utilization of antimoniate of N-methylglucamine. The aim of this study was to analyze the treatment of children admitted to a reference hospital, focusing in particular on the use of antimoniate of N-methylglucamine and on the supportive measures adopted. MATERIALS AND METHODS: Medical records of children treated for VL from January 1998 to February 2005 in the Hospital of the University of Mato Grosso do Sul, Central-West Region of Brazil, were reviewed retrospectively. RESULTS: A total of 116 children were treated, and 111 received antimoniate as the first therapeutic choice. The drug was highly efficient (96.9%) in patients with no signs of gravity on admission, in cases presenting warning signs of potential evolution to gravity, and even in some severely ill children. The most common adverse effects were increases in transaminase (22.5%) and amylase (17.5%) levels, and generally reversible electrocardiogram changes (18%). Some problems were detected during the treatment, such as inadequate prescription (causing an under- or overdose) or inappropriate change to a second-line scheme. Of the 116 children, 80% were given antibiotics, 71.5% needed a transfusion of red blood cells, 10.3% required a transfusion of platelets, fresh frozen plasma was given to 4.3%, albumin was administered in 3.4, and 8.6% needed intensive care support. The mortality rate was about 2.6%. CONCLUSION: Antimoniate of N-methylglucamine remains highly efficient and well tolerated in pediatric patients, which allows its utilization as a first-line therapy in Brazilian children until a better drug for widespread use becomes available; however, it should be used with caution, and special attention is required during its prescription and for the management of adverse effects. The low mortality rate obtained confirms that, in addition, successful treatment demands the correction of serious anemia and thrombocytopenia, the vigorous use of antibiotics to fight intercurrent bacterial infections, and sometimes the availability of intensive care units to treat more severe patients.