Chapter 29: The High-Risk Newborn: Problems Related to Gestational Age and Development

Late preterm infants, delivered between 34 and 36 weeks of gestation, present a clinical paradox wherein physical appearance suggests maturity while underlying physiological systems remain insufficiently developed, creating vulnerability to respiratory compromise, ineffective thermoregulation, and nutritional feeding challenges. The pathophysiology of respiratory distress syndrome is examined through the lens of inadequate pulmonary surfactant production, with detailed discussion of therapeutic interventions including supplemental oxygen delivery systems, continuous positive airway pressure application, and mechanical ventilation strategies tailored to fragile lung tissue. Thermoregulation emerges as a foundational care priority, requiring understanding of heat loss mechanisms and implementation of neutral thermal environments through incubators, radiant heat sources, and skin-to-skin contact methods that simultaneously promote thermal stability and parental bonding. The chapter explores complications stemming from renal immaturity and excessive insensible water losses, necessitating careful fluid and electrolyte management alongside rigorous skin protection protocols in immunocompromised populations at heightened infection risk. Pain recognition and mitigation strategies are presented with evidence supporting both non-pharmacological approaches such as containment techniques and non-nutritive sucking alongside pharmacological interventions. Developmentally supportive care principles are integrated throughout, emphasizing environmental modification to minimize overstimulation and preserve metabolic energy for growth and healing. Nutritional management progresses systematically from parenteral supplementation through tube feeding methodologies to oral intake advancement, with particular attention to breast milk's protective immunological properties against necrotizing enterocolitis. The chapter differentiates specific complications including bronchopulmonary dysplasia, intraventricular hemorrhage, and retinopathy of prematurity with their respective management approaches. Postterm and growth-restricted infants present distinct pathophysiological challenges including postmaturity syndrome and meconium aspiration complications, while large-for-gestational-age neonates face birth trauma and hypoglycemic risks. Finally, psychosocial support for families navigates parental attachment facilitation and discharge preparation, recognizing the emotional dimensions of neonatal intensive care.