Clinical Outcomes of Ready-to-Use Parenteral Nutrition in Low Birth Weight Newborns in Colombia 2017-2023

The proposed study aims to assess the clinical outcomes of using ready-to-use parenteral nutrition, specifically Numeta G13E, compared to individualized parenteral nutrition in neonates with very low birth weight. Conducted in a level 4 neonatal intensive care unit from March 2017 to March 2023, the study focuses on growth parameters (weight, head circumference, height), growth velocity, and the incidence of complications. The retrospective open-cohort observational design involves a sample of 284 infants, 142 in each group, considering a 95% confidence level and 80% power. The study addresses the need for a local evaluation of the efficacy of ready-to-use parenteral nutrition in this vulnerable population.

Introduction: Parenteral nutrition enhances nutrition in very low birth weight newborns (\<1500 g) who, due to gastrointestinal immaturity, experience delays in obtaining adequate nutrients enterally. Parenteral nutrition (PN) promotes better growth in all anthropometric variables in this population. However, complications associated with its use have been documented. A commercial method developed to reduce these complications is ready-to-use parenteral nutrition, a three-chamber bag providing a complete mix of nutrients, offering immediate access, quicker initiation of nutrition, and prescription homogenization. These factors aim to achieve better metabolic stability, improved nutritional intake, and weight, height, and head circumference gain. This study aims to evaluate outcomes with the initiation of ready-to-use parenteral nutrition. Theoretical Framework: Advances in favorable clinical outcomes for preterm newborns result from multiple interventions such as cardiorespiratory support and early infection identification. Despite these efforts, morbidity and mortality outcomes remain stagnant. Optimizing nutritional coverage, especially in preterm infants, is one of the objectives to improve outcomes. Premature infants, due to their immaturity and typically critical clinical condition, require early initiation of parenteral nutrition to guarantee their nutritional needs and reduce the possibility of extrauterine growth restriction. There is also an association between early protein and energy intake and improved neurodevelopment. While the benefits of early parenteral nutrition initiation in preterm infants are evident, it is classified as a high-risk medication due to potential errors in preparation, leading to biochemical alterations and infection risk. Standardized ready-to-use nutrition is considered a safe alternative, particularly in institutions with limited technological resources. Commercial preparations like Numeta 13% meet the requirements recommended by the European Society for Pediatric Gastroenterology, Hepatology, and Nutrition (ESPGHAN) for very low birth weight neonates (\<1500 g) and extremely low birth weight preterm infants (\<1000 g), presenting a cost-effective alternative to individualized preparations. Despite the proven need for early parenteral nutrition in critically ill neonates, studies reveal variations in protocol adherence, with a significant percentage of units initiating late protein intake and low energy content. Institutional protocols and software utilization could address these challenges. Continued controversy exists regarding the optimal composition of parenteral nutrition. While individualized nutrition allows adjustments, especially in preterm infants prone to electrolyte imbalances and metabolic control issues, ready-to-use preparations, though less tailored, show no significant differences in complications. A proposed cohort study aims to assess significant differences between preterm infants receiving individualized and ready-to-use parenteral nutrition locally. Justification for the Study: Very low birth weight newborns require multiple supports, including thermal, respiratory, hemodynamic, and nutritional. Ready-to-use parenteral nutrition, with its immediate availability and standardized composition, reduces infection risks. This study aims to compare clinical outcomes between individualized and ready-to-use parenteral nutrition in terms of metabolic stability, infections, and growth in preterm infants. Existing studies highlight growth delays in preterm infants, associated with poor neurodevelopment and future metabolic and cardiovascular complications. Early trophic stimulation, supported by parenteral nutrition, facilitates a smooth transition with adequate nutrient supply, aiming for appropriate weight gain. Recognized publications such as ESPGHAN and NICE endorse the use of ready-to-use parenteral nutrition for its safety, immediate availability, and suitability for approximately 85% of patients. Only the remaining 15% may require individual adjustments for specific metabolic issues. An analytical study as proposed would allow local insights into clinical outcomes in neonates receiving individualized vs. ready-to-use parenteral nutrition. Research Question: What are the clinical outcomes of using ready-to-use parenteral nutrition compared to individualized parenteral nutrition in very low birth weight neonates in a level 4 Neonatal Intensive Care Unit during the period March 2017-March 2023? Research Hypotheses: Alternative Hypothesis: There are differences in anthropometric measurements and complication incidence between very low birth weight patients receiving individualized parenteral nutrition and Numeta G13E ready-to-use. Null Hypothesis: There are no differences in anthropometric measurements and complication incidence between very low birth weight patients receiving individualized parenteral nutrition and Numeta G13E ready-to-use.