Effects of High vs. Standard Protein Intake in Newborn Extreme Premature

METHODS:

Types of study: randomized single-blinded clinical trial. Time and place of development: Neonatology Service (NICU, Neonatal Ward and Premature Ward) in the Unidad Medica de Alta Especialidad Número 48, of Instituto Mexican del Seguro Social in Leon, Mexico, in the period between 1st of August 2012 and 31st of January 2013. This study was approved by local ethical committees of the hospital and University of Guanajuato. Informed consent was requested in writing to parents to include their children into the study

Inclusion criteria

• Preterm infant of less than 32 gestational weeks and weighting less than 1500g.

Exclusion criteria

• Preterm infant with severe congenital malformation
• Patients with acute kidney failure.
• Inform consent form not signed.

Methodology For the accomplishment of the present trial all premature patients weighting less than 1500g and less than 32 weeks of age were included, and also the patients referred by the other units in less than 24h after birth. Randomization was carried out using closed envelopes with the assigned amino acid doses, constituting two groups: group A with an initial doses of 2.5 g/kg/day with daily increments of 0.5 g/kg/day until reaching 3.5 g/kg/day; group B with an initial doses of 2.5 g/kg/day with daily increments of 0.5 g/kg/day until reaching 4 g/kg/day.

The amino acids administered are from Pisa Laboratory (Levamin Nomo 10%, ®), with the following composition in every 100 ml: 511 mg of L-isoleucine, 725mg of L-leucine, 934 mg of L-licina, 396 mg of L-methionine, 724 mg of L-phenylalanine, 514 of L-threonine, 180mg of L-tryptophan, 668 mg of L-valine, 1025 mg of L-arginine, 443 mg of L-histidine, 1469 mg of L-alanine, 40 mg of L-Sistine, 1198 mg of Glycine, 590 mg of L-proline, 500 mg of L-serine, 235 mg of L-aspartic acid, 309 mg of L-glutamine acid and 36mg of L-tyrosine.

For the study of renal function baseline urea, creatinine and BUN were measured within 24 h after birth in order to avoid any alteration cost by mother alter kidney function, afterwards the same markers were measured at the day 7, 14, 21 and 28. These markers were measure using orto-clinical diagnostic series 50-0278 USA.

The anthropometric measurements were assessed weekly by the same person to avoid bias (cephalic perimeter and height); weight was measured weekly using the same scale (SECA model 3741321009, Germany). All anthropometric and lab results were kept in a collection sheet.

The presence of sepsis was diagnosed using clinical signs of systemic inflammatory response and a positive blood culture, necrotizing enterocolitis was diagnosed using Bell's criteria and permeable artery duct was defined by a connection between the aorta and the pulmonary artery with a left to right shunt; death was also evaluated.

Sample Size The sample size was calculated for 24 patients in each group as necessary to detect a delta of 15% in the weight variable (beta error of 20 % and alpha error of 5%). 10% losses were assumed, resulting in a total of 28 needed patients per group.

Statistical analysis

Central tendency measures were used for all variables and also chi square test for qualitative variables were applied, T-student test for continuous variables ad for multiple measurements ANOVA Test was applied. The software used was NCSS v. 8.0 (Kaysville, Utah USA)

Inclusion criteria

• Preterm infant of less than 32 gestational weeks and weighting less than 1500g

Exclusion criteria

• Preterm infant with severe congenital malformations.
• Patients with acute kidney failure.
• Inform consent form not signed.