Bone Status and Early Nutrition in Preterm Newborns with and without Intrauterine Growth Restriction

Area of Science:

• Neonatology
• Pediatric Bone Health
• Nutritional Science

Background:

• Intrauterine growth restriction (IUGR) combined with preterm birth poses significant risks to infant bone development.
• Assessing bone status in preterm infants, particularly those with IUGR, is critical for early intervention.
• Nutritional management plays a pivotal role in the bone health of preterm neonates.

Purpose of the Study:

• To compare bone status between preterm infants with and without IUGR.
• To identify nutritional management strategies that correlate with improved bone status in IUGR preterm infants.
• To analyze factors influencing bone development in preterm neonates up to 36 weeks of gestational age.

Main Methods:

• A cohort of 150 preterm newborns (<34 weeks gestational age), including 75 IUGR and 75 non-IUGR infants, were monitored.
• Bone status was assessed using metacarpus bone transmission time (mc-BTT) via quantitative ultrasound.
• Anthropometric measurements, biochemical parameters (phosphate), and nutritional intakes (parenteral nutrition) were tracked.

Main Results:

• IUGR infants exhibited significantly lower mean mc-BTT and plasma phosphate levels at birth compared to non-IUGR infants.
• At 36 weeks gestational age, mc-BTT correlated positively with initial phosphate, energy intake, and negatively with time to full enteral feeding in IUGR infants.
• Lower intravenous vitamin D, reduced lower limb length (LLL), and prolonged total parenteral nutrition predicted poorer mc-BTT at 36 weeks.

Conclusions:

• Preterm infants, especially those with IUGR, demonstrate compromised bone status at birth.
• Specific nutritional interventions, including adequate energy, phosphate, and vitamin D, are essential for bone development in these infants.
• Careful monitoring and tailored nutritional strategies are necessary to optimize bone health outcomes in preterm neonates with IUGR.