Role of Iron Supplementation in Neurodevelopmental Outcome of Extremely Preterm Infants - A Pilot Study
Role of Iron Supplementation in Neurodevelopmental Outcome of Extremely Preterm Infants - A Pilot Study
This study explores the relationship between iron deficiency and neurological outcome of extremely premature infants. Premature birth occurs during a critical period of brain development and maturation, and before adequate transfer of iron across the placenta. Nutrition has a significant impact on ultimate outcome of survivors of prematurity. One of the biomarkers of nutrition in the premature infant is iron, and iron supplementation is essential for growth and brain development at low gestational age. As a result, the Committee on Nutrition of the American Academy of Pediatrics (AAP) recommends daily oral iron supplementation, of at least 2-4 mg/kg/day from 2 weeks of age, to prevent iron deficiency in extremely premature infants. Nevertheless, studies have shown that even with this regular care dose of iron, started from 2 weeks of age, a significant number of premature infants will still develop iron-deficiency. Our hypothesis states that starting high dose iron supplementation early will improve neurological development and outcome in extremely premature infants (those born at less than 28 weeks gestational age). This study will provide data showing whether individualized iron supplementation using higher doses of iron, started earlier (after the first week of life) when guided by periodic screening of their body's iron status with ferritin levels, will mitigate iron deficiency and promote improved neurodevelopmental outcome in this vulnerable infant population.
This is a prospective, randomized, unblinded, controlled study of early, high-dose iron for neuroprotection in extremely preterm infants born between 24 0/7 weeks and 30 6/7 weeks gestation. This study has chosen to study newborns between 24-0/7 and 30-6/7 weeks of gestation because of (1) high likelihood of poor outcome, (2) highest risk of iron deficiency and potentially most likely to benefit from intervention based on their stage of brain development, (3) previously studied to assess safety of this iron regimen in Preterm Erythropoietin Neuroprotection Trial (PENUT) protocol, and (4) absence of therapeutic interventions to improve neurodevelopmental outcome. Study sample size is 90 patients; to be enrolled at Ann & Robert H Lurie Children's Hospital-Prentice Women's Hospital. We expect to evaluate 82 infants at 10-14 months and 22-26 months corrected age, our primary endpoints. There is no enrollment restriction based on race, ethnicity or gender. Enrollment is expected to take 18-24 months, with each subject with each subject participating through 24-26 months corrected age when final neurodevelopmental outcomes are assessed. Subjects will be randomized locally to regular-dose iron as recommended by AAP or early, high-dose iron. High-dose iron will continue until 36 weeks corrected age. Serial measurements of hemoglobin, reticulocyte count, reticulocyte hemoglobin equivalent and ferritin levels will be obtained, starting 2 weeks after starting iron supplementation, with final measurement obtained at 40 weeks corrected age or prior to discharge, whichever is first. Data will be abstracted regarding interval medical history from the electronic medical record. After discharge, Neonatal Intensive Care Unit (NICU) developmental follow-up will occur at 12 months and 24 months corrected age, at which time standardized neurodevelopmental assessments will be performed. The outcome measure is neurodevelopmental outcome at 10-14 months and 22-26 months of age. Our estimated sample size is based on the assumption that early high dose iron supplementation will reduce abnormal neurological outcome by 16%-29%, and taken together with an estimated 10% anticipated loss due to unrelated deaths, the total sample size was calculated at 90 infants (45 in each arm of the study).
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