8.3 Neonatal Resuscitation, Jaundice, Respiratory Distress & Prematurity

Neonatal Resuscitation, Jaundice, Respiratory Distress & Prematurity

Neonatology represents a critical subspecialty (~20% of Pediatrics) on the SMLE. Mastery of the 8th Edition Neonatal Resuscitation Program (NRP) algorithm, evaluation of neonatal hyperbilirubinemia, differentiation of newborn respiratory distress etiologies, and management of premature infant complications (NEC, IVH) is essential.

Neonatal Resuscitation Program (NRP 8th Edition) Algorithm

Resuscitation of the newborn focuses primarily on establishing effective lung inflation and ventilation rather than cardiac intervention.

Initial Assessment & Rapid Decision Tree

Upon delivery of any infant, immediately answer three rapid triage questions:

1. Is the infant Term? (Gestational age ≥37 weeks)
2. Does the infant have Good Muscle Tone? (Active flexion)
3. Is the infant Breathing or Crying? (Vigorous respiratory effort)

• If YES to all three: Infant remains with the mother for routine care (skin-to-skin contact, clear airway if needed, dry, monitor).
• If NO to ANY question: Move infant to a preheated radiant warmer immediately and execute initial steps within 30 seconds:
  • Warm and maintain body temperature (36.5°C to 37.5°C).
  • Position head and neck in "sniffing position" to open airway.
  • Clear secretions from mouth then nose (bulb syringe or suction) if airway obstructed.
  • Dry thoroughly and discard wet linens.
  • Stimulate by gently rubbing the back or flicking the soles of feet.

Positive Pressure Ventilation (PPV) Protocol

• Indication: If the infant remains apneic, gasping, or heart rate is <100 beats per minute (bpm) after initial steps, initiate Positive Pressure Ventilation (PPV) within 60 seconds of birth ("The Golden Minute").
• PPV Parameters: Room air (21% O2) for term infants; 21–30% O2 for preterm (<35 weeks). Initial PIP 20-25 cmH2O, PEEP 5 cmH2O, rate 40-60 breaths/min.
• Assessing PPV Effectiveness: Check heart rate after 15 seconds of PPV. If HR is not increasing and chest is not moving, execute MR. SOPA ventilation corrective steps:
  • Mask adjustment.
  • Reposition head/neck.
  • Suction mouth and nose.
  • Open mouth.
  • Pressure increase (incrementally by 5 cmH2O up to max 40 cmH2O).
  • Alternative airway (Endotracheal Tube or Laryngeal Mask Airway).
• Chest Compressions: If heart rate remains <60 bpm despite 30 seconds of effective PPV via endotracheal tube: increase FiO2 to 100%, initiate Chest Compressions (two-thumb encircle technique over lower third of sternum) at a 3:1 ratio (90 compressions and 30 breaths per minute). If HR remains <60 bpm after 60s of compressions, administer IV Epinephrine (0.02 mg/kg via umbilical venous catheter).

APGAR Score System

Assessed routinely at 1 minute and 5 minutes of life (and every 5 minutes up to 20 minutes if score <7). APGAR scores do NOT dictate the initiation of resuscitation; resuscitation must begin immediately without waiting for 1-minute APGAR.

Neonatal Hyperbilirubinemia (Jaundice)

Bilirubin encephalopathy (Kernicterus) occurs when unconjugated lipid-soluble bilirubin crosses the blood-brain barrier, depositing in the basal ganglia. Features: Lethargy, hypotonia, high-pitched cry, retrocollis, opisthotonos, sensorineural hearing loss, and cerebral palsy.

Pathologic vs. Physiologic Jaundice Differentiation

• Pathologic Jaundice (ALWAYS Abnormal):
  1. Appears within the first 24 hours of life.
  2. Total serum bilirubin (TSB) rising rapidly at >5 mg/dL/day (>85 μmol/L/day).
  3. TSB exceeding phototherapy thresholds on the Bhutani Nomogram.
  4. Conjugated (Direct) Bilirubin >1.0 mg/dL (if TSB <5) or >20% of TSB (indicates cholestasis: Biliary Atresia, Neonatal Hepatitis).
  5. Jaundice persisting >14 days in term infants.
  • Major Etiologies: ABO Incompatibility (Mother O, Baby A/B; positive Direct Coombs test); Rh Isoimmunization; G6PD Deficiency; Hereditary Spherocytosis; Sepsis.
• Physiologic Jaundice: Appears on day 2-3 of life, peaks at day 3-5 (TSB <12-15 mg/dL), and resolves spontaneously by 1-2 weeks. Driven by transient low hepatic UDP-glucuronosyltransferase (UGT1A1) activity and increased RBC turnover.
• Breastfeeding Jaundice (First Week): Inadequate milk intake leading to dehydration, delayed stooling, and increased enterohepatic circulation of bilirubin.
• Breast Milk Jaundice (After First Week): Substance in breast milk (beta-glucuronidase) promoting bilirubin deconjugation. Patient is thriving with normal weight gain; benign.

Phototherapy & Exchange Transfusion

• Phototherapy (Blue-Green Light 460-490 nm): Converts unconjugated bilirubin into water-soluble structural isomer Lumirubin, excreted in bile and urine without conjugation.
• Exchange Transfusion: Indicated when TSB reaches dangerous levels despite intensive phototherapy, or in severe immune hemolysis with rapidly rising TSB, to prevent Kernicterus.

Neonatal Respiratory Distress: Differential Diagnosis

Complications of Extreme Prematurity

• Necrotizing Enterocolitis (NEC): Ischemic necrosis of intestinal mucosa in premature infants, precipitated by enteral feeding. Presentation: Abdominal distention, feeding intolerance, bilious emesis, bloody stools, abdominal wall erythema. Pathognomonic X-ray: Pneumatosis Intestinalis (gas bubbles in bowel wall) and portal venous gas. Pneumoperitoneum (free air under diaphragm) indicates bowel perforation requiring emergency laparotomy. Medical Management: NPO, gastric decompression, broad-spectrum IV antibiotics (Ampicillin + Gentamicin + Metronidazole).
• Intraventricular Hemorrhage (IVH): Bleeding into the subependymal germinal matrix in Very Low Birth Weight (VLBW <1500g) infants <32 weeks. Germinal matrix is fragile and vulnerable to blood pressure fluctuations. Diagnosis: Routine Screening Cranial Ultrasound at 7-14 days of life. Papile Grading I to IV (Grade IV: Parenchymal hemorrhage with high hydrocephalus risk).