Background: Cardiac tumors are very uncommon at all ages. There are important clinical differences between children and adults in the behavior (Rev Méd Chile 2006; 134: 1135-45).

Effects of two forms of vitamin D supplementationon bone metabolism and infants growth mont" of life. Weight, height, head circumference, serum cole urn, phosphorus, alkcl'ne phosohatcse, parathyroid hormone and 1.25 (OH) 2 vit D, were comoored. Statistically signif'cant favcuraole di^e'ences for daily doses were found from he thirc month on heigh*, from the sixth norrh on weight one fro 11 the eighth month of life on head c'rcunference. Blooc pressure was hiche-soecially 30.. 60, vO and 120 days aHer the first 6CO COO ID vit D megaccse. Mean serum 1 .25 (Oh)-, v't D, was cor-s'stently higher in oatiets given mosive vitamin doses,. I I 10 end 96 pg/m at third and sixh mo~m, as compa-ed wrh 55 pg/ml respective 1 )' in subjects irder cai : y doses).No statistic other differences were found in ot^er of blood measu r emen's. Supplementation of 400 daily IU, is physiologically sounder as it oromotes grow'h, avoids risk of intoxication and potentia : of tra^sien* induced hypertension cr this age. Local r ecorrmendaiions favoring vr D megadoses for rickets prevention s~cUd be revised.(Keywords: bone metcboism, vitamin D, i-fant, growln, arte'icl -ypertension.)La forma activa dc la vitamina D (vit D), la 1-25 dihidroxi vit D (L25 OH 2 vit D), participa como una hormona en la regulacion del metabolismo del calcio y f6sforo. La cantidad ncccsaria para alcanzar la funcion fisiologica optima en el lactante depende de numcrosos factores como edad, ritmo de crecimiento, absorcion intestinal, enfermcdades coexistentes y clima 1 .Los requerimientos dc vit D durante el primer ano de vida sc cstiman entre 100 y 400 UI diarias 2 --7 . La leche materna aporta aproximada-

The adapted ConQol questionnaire matched properly with the original one. The adapted questionnaire is valid and reliable to assess Health Quality of Life among Chilean children with congenital heart diseases.

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