Preoperative Nutritional Intervention and Outcomes of Children Submitted to Heart Surgery for Congenital Heart Diseases

Inclusion Criteria: * Patient with congenital heart disease requiring elective surgical correction; * Age\> 30 days and ≤ 5 years, with the aim of excluding the neonatal period, which are operated children with complex heart defects, and older children, where the time living with the disease damages the myocardium and the pulmonary circulation, leaving only children with fewer serious and, in general, are less subjected to complex surgery diseases. Exclusion Criteria: * Chronic gastrointestinal diseases (defects, malabsorption, celiac disease, inflammatory bowel disease, diabetes mellitus); * Patients with other organic defects that may compromise the growth and / or nutritional status; * Patients undergoing emergency surgery; * Request of parents or guardians at any time; * Patients receiving exclusive breastfeeding; * Died during the study period; * Patients using cardiac pacemaker or other electrical or electronic device that interferes with the reading of the electrical bioimpedance.