Newborn Care

Thermogenic Adaptations

• Importance of Temperature Regulation:
  • There is a critical connection between thermogenic adaptations and metabolism; hypothermia can be life-threatening for neonates.
• Challenges in Temperature Regulation:
  • Neonates have less subcutaneous fat and premies have even lower adipose tissue, making it hard for them to maintain body heat.
  • The goal is to maintain a neutral thermal environment (NTE).

Physiological Adaptations for Heat Production

• Cold Response Mechanisms:
  • Basal metabolic rate increases.
  • Enhanced muscle activity.
  • Non-shivering thermogenesis involves chemical heat production within the body utilizing brown fat.

Mechanisms of Neonatal Heat Loss

1. Evaporation:
   • Loss of heat through moisture from the skin.
2. Conduction:
   • Direct contact with colder surfaces.
3. Convection:
   • Heat loss through air currents.
4. Radiation:
   • Heat loss through proximity to cooler surfaces without direct contact.

Cold Stress

• Impact of Cold Stress on Neonates:
  • Cold stress must be prevented just as the ABCs (Airway, Breathing, Circulation) are priority in care.
• Vulnerability Factors:
  • Large body surface area in relation to body mass.
  • Limited subcutaneous fat and brown fat.
  • Reduced ability to shiver and thin skin with blood vessels near to the surface.
• Temperature Guidelines:
  • Neonate’s temperature equal to or less than $36\degree C/97.6\degree F$ is concerning.
• Cold stress implications:
  • Increased oxygen needs, which can lead to hypoxia, hypoglycemia, metabolic acidosis, decreased surfactant production, and respiratory distress.

Nursing Actions to Prevent Cold Stress

• Immediate Interventions:
  • Dry the newborn immediately, remove wet blankets, and delay bathing.
  • Keep away from walls and windows, using hats and skin-to-skin contact.
  • Swaddle and reassess temperature every 30 minutes.
  • Monitor vital signs every 5 minutes.
  • Perform heel stick to check for hypoglycemia (glucose below $40 \text{ mg/dL}$).

Jaundice in Newborns (Hyperbilirubinemia)

• Liver Function:
  • The primary function of the liver is conjugating bilirubin.
• Bilirubin Definition:
  • Bilirubin is neurotoxic and produced during the breakdown of RBCs and hemoglobin and exists as unconjugated (indirect).
• Conjugation Process:
  • The liver converts lipid-soluble, unconjugated bilirubin into water-soluble conjugated bilirubin, allowing excretion through stool primarily and kidneys minimally.
• Risks of Hyperbilirubinemia:
  • Excessive unconjugated bilirubin builds up in the bloodstream, leading to kernicterus characterized by potential complications: hearing and vision problems, cerebral palsy, cognitive disabilities, seizures, apnea, and even death.

Nursing Actions to Decrease Elevated Bilirubin Levels

• Preventive Strategies:
  • Maintain the infant’s temperature at around $97.8\degree F$.
  • Monitor stools, initiate early breastfeeding as colostrum provides a laxative effect to excrete meconium.
  • Encourage breastfeeding frequently (10-12 times daily) and ensure adequate hydration.
  • Implement skin-to-skin contact, adequate latching, and address feeding cues with lactation referrals as needed.
• Vitamin K and Phototherapy Protocol:
  • Shield eyes during light treatment, keep baby uncovered while feeding, monitor temperatures, and promote stool clearance by feeding every 2 hours.

Newborn Reflexes

APGAR Scoring

• Colloquial Practice:
  • Do not wait 1 minute if resuscitation is indicated.
  • If the score is less than 7 at 5 minutes post-birth, a 10-minute score should be recorded.
  • Ensure proper identification (ID bands) are placed with APGAR scores.

Pre/Post-Term Newborn Assessment

Newborn Classification

• Definitions:
  • Large for Gestational Age (LGA): >90th percentile.
  • Appropriate for Gestational Age (AGA): 10th to 90th percentile.
  • Small for Gestational Age (SGA): <10th percentile.

Preterm Neonates: Degrees of Prematurity

• Classification:
  • Very Premature: <32 weeks
  • Premature: 32-34 weeks
  • Late Preterm: 34-37 weeks
• Weight Classifications:
  • Low birth weight: <2500 g
  • Very low birth weight: <1500 g
  • Extremely low birth weight: <1000 g

Plan of Care for Preterm Neonates

• Immediate Actions:
  • Possible resuscitation, stabilize for transport, assess gestational age, and provide respiratory support, including maintaining patent airways.
• Environment Control:
  • Ensure neutral thermal environments with plastic wraps or double-walled incubators as necessary.
• Enteral Feedings in Premature Newborns:
  • Begin as soon as feasible to optimize neurodevelopment and simulate uterine growth patterns; utilize colostrum and breast milk whenever possible to decrease NEC (Necrotizing Enterocolitis) risk.
• Neonatal Intensive Care Unit (NICU) Care Strategies:
  • Maintain a quiet setting with dim lights, cluster activities appropriately, and provide individual care while allowing breaks and minimizing handling.

Post-Term Newborns: Signs and Symptoms

• Indicators:
  • Meconium-stained cord, peeling skin, cracked skin, long fingers, and signs of muscle wasting.

Newborn Respiratory Distress Syndrome

• Key Indicators and Concerns (Red Flags):
  • Tachypnea (greater than 60 breaths/min), retractions, grunting, nasal flaring.
  • Cold stress can lead to increased oxygen needs and respiratory distress.
• Meconium Aspiration Syndrome (MAS):
  • Occurs when a newborn aspirates meconium, confirmed via chest X-ray showing diffuse opacities and atelectasis.
  • Care Strategy: Focus on suctioning, chest PT, oxygen administration, antibiotics, and potential mechanical ventilation.
• Surfactant Deficiency:
  • Surfactant is a slippery phospholipid that prevents alveoli from collapsing, facilitating gas exchange. Insufficient amounts (typically before 35 weeks gestation) contribute to respiratory distress.
  • Treatment (Beractant/Survanta): Administered intratracheally to premature newborns to lower surface tension at the alveoli level.

Preterm Adjusted Age

• Adjusted age (or corrected age) is calculated by subtracting the number of weeks an infant was born prematurely from their chronological age. This allows for assessment of growth and development relative to their biological maturity.

Education for Parents of Preterm Newborns

• Key Areas of Education:
  • Understanding their infant's unique care needs, including maintaining a neutral thermal environment (NTE) and feeding protocols, especially the importance of breast milk/colostrum to reduce risks like Necrotizing Enterocolitis (NEC).
  • Recognizing signs of complications such as NEC (abdominal distension, bloody stools, vomiting, shock), hypoglycemia, and respiratory distress.
  • Encouragement for skin-to-skin contact, swaddling, and proper feeding techniques.
  • Providing information on the NICU environment and rationale for interventions like clustered care.
  • Reassuring parents about the timeline for their infant's development and how to interpret their cues.