Malnutrition Clinical Trial
Official title:
Effects of High vs. Standard Protein Intake in the Weight Gain and Renal Function Security in Newborn Extreme Premature
Introduction:
The preterm newborn of extremely low birth weight (PNELW), endures adverse nutritional
conditions to mimic intrauterine growth. It´s known that amino acids contribute to protein
synthesis, but also intervene in weight gain. Most newborns receive amino acids throw
parenteral nutrition at a doses of 3.5gr/k/day, that doses its unable to reach the birth
weight when discharged, so the weight its below the 10th percentile, which rises the risk for
presenting alterations in neurodevelopment.
Objective:
To compare a higher doses of parenteral amino acids vs. standard doses, expecting an
increased weight gain in the high amino acid doses group, meanwhile following the renal
function security profile
Methods:
A randomize, single blind clinical trial, carried on, in the Neonatology Service of Unidad
Medica de Alta Especialidad Numero 48 of the Instituto Mexicano del Seguro Social, in the
city of Leon, Mexico. Between the period of 1st August 2012 to 31 January 2013. A standard
doses of amino acids was administered (3.5gr) to a control group and a high doses (4gr) to an
experimental group. Weight, urea, creatinine and blood urea nitrogen (BUN) were measured
weekly. In the study were included all preterm newborns (PN) weighting less than 1500 grs and
with less than 32 weeks of gestational age that match all the inclusion criteria. Statics
Analysis: descriptive statistics were calculates, also chi2 test and Fisher Exact test were
applied to categorical variables, t-student test to continuous variables, and ANOVA in
multiple groups.
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
1. Preterm infant of less than 32 gestational weeks and weighting less than 1500g.
Exclusion criteria
1. Preterm infant with severe congenital malformation
2. Patients with acute kidney failure.
3. 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)
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