Optimization of nutritional management of preterm infants is crucial for achievement of their long-term health. Enteral nutrition is preferred to total parenteral nutrition (TPN) because the former avoids complications related to vascular catheterization, sepsis, adverse effects of TPN, and fasting. Due to the lack of ability of preterm infants to coordinate suckling, swallowing, and breathing, tube feeding is necessary for most infants less than 1500 g to ensure sufficient feeding tolerance, to support optimal growth and to reduce the risk of aspiration. Therefore, feeding by orogastric or nasogastric tube using either continuous or intermittent bolus delivery of formula or human milk is common practice for these infants. Theoretical risks and benefits of both continuous nasogastric milk feeding and intermittent bolus milk feeding have been proposed. According to the literature, continuous nutrition could be preferred in smaller infants (as those with a birthweight below 1250 g) or hemodynamically impaired infants; in stable growing infants nutrition can be administered intermittently as in healthy term infants.
IntroductionApproximately 8% of infants are born with a weight at birth less than 2.5 kg. 1 These infants face uncertain futures, ranging from insufficient postnatal growth to compromised neurodevelopmental outcomes. 2 Thus, optimization of their nutritional management is crucial for achievement of their long-term health and wellbeing. There is a correlation between the neurocognitive outcome and growth, for this reason an adequate nutrition is essential for the optimal growth and health. Most of severe preterm infants are discharged weighing less than the tenth percentile for age despite improvements in their nutritional management. 3 Some of them remain small to adulthood and exhibit adverse long-term developmental outcomes including learning impairments and reduced work capacity. 4,5 Because growth failure of low birth weight (LBW) infants has been attributed, in part, to the provision of inadequate levels of protein and energy, more aggressive nutritional support is now being advocated. 6 Evidence suggests that this approach is justified because early provision of amino acids to extremely LBW infants is associated with improved growth; 7 moreover provision of adequate amount of amino acid increases whole body protein synthesis and accretion rates in LBW infants. 8 Parenteral feeding allows rapid nutrition when enteral nutrition is not possible due to respiratory problems, limited gastric capacity, reduced intestinal mobility, and a perceived risk for necrotizing enterocolitis. 6 When an infant is medically stable, minimal enteral feeding is provided to prime the intestine and gradually the infant is moved from parenteral to enteral feeding until achievement of full enteral feedings.Enteral nutrition is preferred to total parenteral nutrition (TPN) because the former avoids complications related to vascular catheterization, sepsis, adverse effects of TPN, and fasting. Moreover, enteral feedin...