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🍼 PEDIATRICS 1: NEONATOLOGY

Comprehensive Exam-Oriented Notes

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1. NEWBORN ASSESSMENT & DEFINITIONS

Gestational Age Classification

Birth Weight Classification

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2. APGAR SCORE

Score interpretation: 7–10 = Normal; 4–6 = Moderate depression; 0–3 = Severe depression ⚠️ APGAR is NOT used to decide whether to resuscitate — resuscitation decisions are based on breathing, tone, and heart rate.

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3. GESTATIONAL AGE ASSESSMENT — BALLARD SCORE

1. Posture — 0 (arms/legs extended) → 4 (full flexion)
2. Square window — angle of wrist flexion (full term = 0°)
3. Arm recoil — after 5 sec flexion, angle after release (full term = <90°)
4. Popliteal angle — extension of knee (full term = <90°)
5. Scarf sign — elbow reaches past midline = preterm
6. Heel-to-ear — foot to head distance (full term = large distance)

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4. NEONATAL RESUSCITATION (NRP)

Essential Equipment

Initial Steps

1. Warm, dry, stimulate, position airway
2. Assess: Breathing? Heart rate? Tone?
3. If apneic or HR <100 → start Positive Pressure Ventilation (PPV)
4. If HR <60 despite PPV → chest compressions (3:1 ratio with breaths)
5. If HR <60 despite compressions → epinephrine (IV preferred)

Key Points

• Meconium-stained fluid: Routine suctioning of oropharynx/ETT NOT recommended (even for nonvigorous infants)
• Delayed cord clamping: ≥30–60 sec for vigorous term and preterm infants
• Cord milking: NOT for <28 wGA (risk of IVH); insufficient evidence at 32+ weeks

ETT Sizing

Medications in Resuscitation

• Epinephrine: 0.01–0.03 mg/kg IV (0.05–0.1 mg/kg via ETT if no IV access) — for HR <60 despite 30 sec compressions
• Volume expander: Normal saline 10 mL/kg IV for hypovolemia

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5. RESPIRATORY DISTRESS SYNDROME (RDS) / Hyaline Membrane Disease

Etiology

• Surfactant deficiency (phosphatidylcholine/lecithin)
• Most common in preterm infants (<37 weeks); risk inversely proportional to GA
• Other risks: Infant of diabetic mother (IDM), male sex, C-section without labor, perinatal asphyxia, second twin

Clinical Features

• Onset: within first 6 hours of life
• Signs: Tachypnea, grunting, nasal flaring, subcostal/intercostal retractions, cyanosis
• Worsens over 48–72 hours, then improves (if surfactant given)

Diagnosis

• CXR: Ground-glass appearance, air bronchograms, low lung volumes ("white out")
• L:S ratio (lecithin:sphingomyelin): ≥2:1 = lung maturity

Management

1. Antenatal corticosteroids (betamethasone/dexamethasone) if delivery expected at <34 weeks → stimulates surfactant synthesis (most important preventive measure)
2. Exogenous surfactant (beractant, poractant alfa) — via ETT; give early
3. Respiratory support: CPAP → mechanical ventilation as needed
4. INSURE technique: INtubation-SURfactant-Extubation to CPAP

⚠️ Complications: Pneumothorax, IVH, PDA, BPD (bronchopulmonary dysplasia)

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6. NEONATAL JAUNDICE / HYPERBILIRUBINEMIA

Bilirubin Metabolism

• Fetal Hb breakdown → unconjugated bilirubin → albumin-bound → liver (conjugation by UGT1A1) → excreted via bile

Physiologic Jaundice

• Appears after 24 hours of life
• Term: peaks day 3–5, resolves by day 10–14
• Preterm: peaks day 5–7, may persist longer
• NOT physiologic if: Appears <24 h, TSB rises >5 mg/dL/day, direct bilirubin elevated, persists >2 weeks

Pathological Jaundice — Unconjugated (Indirect)

Pathological Jaundice — Conjugated (Direct)

• Direct bilirubin >2 mg/dL and >10% of TSB → always pathological
• Causes: Biliary atresia (most important — stool acholic/clay-colored), choledochal cyst, neonatal hepatitis, TORCH infections, sepsis, metabolic disorders (galactosemia, α1-antitrypsin deficiency, tyrosinemia), TPN

Kernicterus (Bilirubin Encephalopathy)

• Unconjugated bilirubin crosses BBB
• Acute: Hypotonia → hypertonia, high-pitched cry, fever, arching (opisthotonus), seizures
• Chronic: Choreoathetosis, sensorineural hearing loss, upward gaze palsy, dental dysplasia
• Risk increased by: Prematurity, hemolysis, asphyxia, sepsis, hypoalbuminemia, acidosis

Management

"Bronze baby" syndrome: Phototherapy in conjugated hyperbilirubinemia → transient dark skin/urine discoloration

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7. NEONATAL SEPSIS

Definitions

• Early-onset (EOS): First 7 days of life; usually day 0–3; fulminant; associated with maternal/perinatal risk factors
• Late-onset (LOS): >7 days of life; more gradual onset; meningitis more common

Risk Factors for EOS

• Group B Streptococcus (GBS)-positive vaginal culture
• Prolonged rupture of membranes (>18 hours)
• Maternal fever (chorioamnionitis)
• Prematurity
• Fetal distress

Organisms

Clinical Features (Table of Signs)

• Temperature instability (fever ≥38°C or hypothermia <36.5°C)
• CNS: Lethargy, irritability, seizures
• Respiratory: Tachypnea, apnea, grunting
• GI: Poor feeding, vomiting, abdominal distension
• Jaundice
• Petechiae/purpura
• Septic shock: Hypotension, poor perfusion

Localizing signs (nuchal rigidity, Kernig, Brudzinski) are present in only a minority of neonates with meningitis.

Workup

• CBC with differential, blood culture ×2, CRP/procalcitonin
• Lumbar puncture (LP) — essential if sepsis suspected (meningitis workup)
• Urine culture (especially for LOS)
• CXR if respiratory symptoms

Treatment

• EOS: Ampicillin + Gentamicin (IV)
• LOS (community): Ampicillin + Gentamicin
• LOS (hospital-acquired/NICU): Vancomycin + Gentamicin (or cefotaxime)
• Add antifungal (fluconazole) if Candida risk
• Duration: Bacteremia = 10 days; Meningitis = 14–21 days

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8. PREMATURITY & COMMON COMPLICATIONS

Complications by System

Intraventricular Hemorrhage (IVH) — Papile Grading

Grade III/IV → highest risk of hydrocephalus and neurodevelopmental disability

Apnea of Prematurity

• Cessation of breathing >20 seconds OR shorter if accompanied by bradycardia/desaturation
• Central (most common) — lack of respiratory effort
• Obstructive — upper airway obstruction
• Mixed
• Treatment: Caffeine citrate (methylxanthine), CPAP

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9. NECROTIZING ENTEROCOLITIS (NEC)

Definition

Risk Factors

• Prematurity (inversely related to GA — peak at 30–32 wks)
• Formula feeding (breast milk is protective)
• Gut ischemia, bacterial colonization, hyperosmolar feeds

Clinical Features

• Systemic: Temperature instability, apnea, lethargy, sepsis picture
• Abdominal: Distension, tenderness, erythema of abdominal wall, bloody stools
• Late: Peritonitis, cardiovascular collapse

Bell's Staging Criteria

Pathognomonic Finding

Management

• Stage I–II: NPO, nasogastric decompression, IV antibiotics (ampicillin + gentamicin ± metronidazole), TPN
• Stage III: Surgical consultation; peritoneal drain or laparotomy for perforation
• Bowel resection if necrosis; complications: short gut syndrome

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10. NEONATAL HYPOGLYCEMIA & HYPERGLYCEMIA

Hypoglycemia

• Definition: Serum glucose <40 mg/dL in term and late preterm infants
• Etiology:
  • Insufficient glucose: Inadequate feeds, IUGR, SGA
  • ↓ Glycogen stores: Prematurity, SGA
  • ↑ Insulin: IDM (Infant of Diabetic Mother), Beckwith-Wiedemann syndrome, nesidioblastosis
  • Endocrine: Hypopituitarism, hypothyroidism
  • Sepsis, asphyxia, hypothermia, polycythemia
• Symptoms: Jitteriness, irritability, poor feeding, apnea, cyanosis, seizures, altered tone
• Management:
  • If asymptomatic & glucose 25–40: oral/nasogastric feeds
  • If symptomatic or glucose <40: IV dextrose 200 mg/kg (= D10W 2 mL/kg bolus)
  • Adjust GIR (glucose infusion rate) gradually — no more than 2 mg/kg/min change per 2-hour interval

Hyperglycemia

• Definition: >125 mg/dL (term), >150 mg/dL (preterm)
• Causes: Excess glucose administration, sepsis, hypoxia, neonatal DM, medications
• Management: Gradually decrease GIR; insulin infusion for persistent hyperglycemia; monitor glucosuria

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11. INFANT OF DIABETIC MOTHER (IDM)

Pathophysiology

Complications — "CHIMPANZEES" Mnemonic

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12. NEONATAL PERSISTENT PULMONARY HYPERTENSION (PPHN)

Definition

Causes

• Idiopathic
• Meconium aspiration syndrome (MAS)
• Sepsis/pneumonia
• Congenital diaphragmatic hernia (CDH)
• RDS
• Perinatal asphyxia

Diagnosis

• Differential cyanosis: PreductalSpO₂ (right hand) > PostductalSpO₂ (foot) by >5–10%
• Echo: Pulmonary HTN, direction of ductal shunting
• OI (Oxygenation Index) = (MAP × FiO₂ × 100) / PaO₂

Management

• Optimize oxygenation (target SpO₂ 91–95%)
• iNO (inhaled Nitric Oxide) — first-line pulmonary vasodilator
• HFV (High-frequency ventilation)
• ECMO if refractory (OI ≥25–40)
• Avoid alkalosis/hyperventilation; correct acidosis gently

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13. MECONIUM ASPIRATION SYNDROME (MAS)

Definition

Risk Factors

• Post-term pregnancy (≥42 weeks)
• Fetal distress / hypoxia in utero

Features

• Meconium-stained fluid at delivery
• Respiratory distress (hyperinflation, barrel chest)
• CXR: Patchy, asymmetric opacities; hyperinflation; ± pneumothorax

Management

• Do NOT perform routine oropharyngeal suctioning or intubation (current NRP guidelines)
• Supportive care: O₂, CPAP, mechanical ventilation
• Surfactant replacement (for severe cases)
• iNO + ECMO for associated PPHN

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14. BIRTH TRAUMA

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15. CONGENITAL INFECTIONS — TORCH

CMV = most common congenital infection overall HSV = most dangerous without treatment (90% mortality untreated disseminated)

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16. CYANOSIS IN THE NEWBORN

Differential Diagnosis

• RDS, MAS, pneumothorax, pneumonia, transient tachypnea of newborn (TTN), PPHN, CDH, choanal atresia

• Cyanotic CHD: 5 Ts — Tetralogy of Fallot, Transposition of Great Arteries (TGA), Truncus Arteriosus, Tricuspid Atresia, Total Anomalous Pulmonary Venous Return (TAPVR)

• Sepsis, hypothermia, hypoglycemia, polycythemia, methemoglobinemia

Hyperoxia Test (Nitrogen washout test)

• Give 100% O₂ for 10 minutes
• If PaO₂ rises >150 mmHg → respiratory cause likely
• If PaO₂ fails to rise (<100 mmHg) → cardiac cause likely (right-to-left shunt)

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17. TRANSIENT TACHYPNEA OF THE NEWBORN (TTN)

• Cause: Delayed clearance of fetal lung fluid
• Risk factors: C-section without labor (no thoracic squeeze), term infant, IDM
• Features: Tachypnea (>60/min) starting shortly after birth, grunting, mild cyanosis; usually resolves within 24–72 hours
• CXR: Perihilar streaking, mild hyperinflation, fluid in fissures
• Treatment: Supportive O₂, rarely CPAP; resolves spontaneously

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18. PATENT DUCTUS ARTERIOSUS (PDA)

• Normal closure: Functionally closes at 10–15 hours; anatomically by 2–3 weeks
• Factors that KEEP ductus open: Hypoxia, prematurity, PGE₁ (prostaglandin E₁)
• Factors that CLOSE ductus: O₂, indomethacin/ibuprofen, full-term birth

Clinical Features

• Bounding pulses, wide pulse pressure
• "Machine-like" continuous murmur at left infraclavicular area
• Tachycardia, respiratory distress, pulmonary congestion

Management

• Medical: Indomethacin (COX inhibitor → ↓ PGE₂) or ibuprofen — first-line in premature infants
• Surgical ligation: If medical therapy fails or contraindicated
• Keep open (PGE₁): Required in ductal-dependent CHD (e.g., pulmonary atresia, coarctation)

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19. POLYCYTHEMIA

• Definition: Venous hematocrit >65%
• Causes: IDM, SGA, twin-to-twin transfusion, delayed cord clamping, Beckwith-Wiedemann
• Symptoms: Plethora, hypoglycemia, hyperbilirubinemia, respiratory distress, seizures, renal vein thrombosis
• Treatment: Partial exchange transfusion with normal saline (to reduce Hct to <55%)

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20. KEY HIGH-YIELD MNEMONICS & EXAM POINTS

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Sources: The Harriet Lane Handbook (23rd ed.), Tintinalli's Emergency Medicine, Pathologic Basis of Disease (Robbins), Medical Physiology (Boron & Boulpaep) — *The Johns Hopkins Hospital, Harriet Lane Handbook, 23rd Ed.*These notes cover all major Pediatrics 1 Neonatology exam topics. Here's a quick orientation of what's covered:

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📋 What's Included (20 Topics):

1. Newborn definitions — GA classification, birth weight categories
2. APGAR score — full table + interpretation pearls
3. Ballard score — neuromuscular + physical maturity criteria
4. Neonatal Resuscitation (NRP) — algorithm, ETT sizing, medications
5. RDS / Hyaline Membrane Disease — surfactant, CXR, management
6. Neonatal Jaundice — physiologic vs. pathologic, kernicterus, phototherapy, exchange transfusion
7. Neonatal Sepsis — EOS vs. LOS, organisms, workup, antibiotics
8. Prematurity complications — RDS, BPD, IVH grading, apnea, ROP, PDA
9. NEC — Bell's staging, pneumatosis intestinalis, management
10. Hypoglycemia/Hyperglycemia — definitions, causes, management
11. Infant of Diabetic Mother (IDM) — CHIMPANZEES mnemonic
12. PPHN — differential cyanosis, iNO, ECMO
13. Meconium Aspiration Syndrome
14. Birth Trauma — caput vs. cephalohematoma vs. subgaleal, brachial plexus injuries
15. TORCH infections — key distinguishing features + treatment
16. Cyanosis in the newborn — hyperoxia test, 5 Ts of cyanotic CHD
17. TTN — C-section, CXR findings, self-limited
18. PDA — indomethacin vs. PGE₁, murmur
19. Polycythemia — definition, causes, partial exchange
20. High-yield exam summary table

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📝 NEONATOLOGY — SHORT ANSWER QUESTIONS

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SAQ 1: APGAR Score

• 7–10: Normal
• 4–6: Moderate neonatal depression
• 0–3: Severe neonatal depression

⚠️ Key exam point: The APGAR score is NOT used to decide whether to resuscitate. Resuscitation decisions are based on: breathing, heart rate, and muscle tone assessed immediately at birth.

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SAQ 2: Neonatal Resuscitation

• Is the baby term? Breathing/crying? Good tone?
• If YES → routine care (dry, warm, stimulate)
• If NO → resuscitation sequence

1. Warm, dry, stimulate, position airway (head in "sniffing" position)
2. Assess: Breathing? Heart rate?
3. If apneic or HR <100 bpm: Positive Pressure Ventilation (PPV) at 40–60 breaths/min with room air initially
4. If HR <60 despite 30 sec of effective PPV: Begin chest compressions — 3:1 ratio (3 compressions : 1 breath); rate = 90 compressions + 30 breaths/min
5. If HR <60 despite 30 sec of compressions: Administer epinephrine

• Ineffective bag-mask ventilation
• Meconium-stained fluid + nonvigorous infant (optional)
• Prolonged PPV needed
• Congenital diaphragmatic hernia
• Extreme prematurity

• IV (via UVC): 0.01–0.03 mg/kg (preferred)
• ETT: 0.05–0.1 mg/kg (higher dose, less reliable)

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SAQ 3: Respiratory Distress Syndrome (RDS)

• Primary cause: Deficiency of surfactant (dipalmitoylphosphatidylcholine / lecithin)
• Risk factors: Prematurity (inversely proportional to GA), IDM, male sex, C-section without labor, perinatal asphyxia, second-born twin

• Onset within first 6 hours of life
• Tachypnea (>60/min), expiratory grunting, nasal flaring
• Subcostal/intercostal retractions
• Progressive cyanosis
• Worsens 48–72 hrs, then improves if surfactant produced

• Ground-glass (reticulogranular) pattern — diffuse, bilateral
• Air bronchograms
• Low lung volumes (↓ lung expansion)
• Severe: "White-out" appearance

1. Prevention: Antenatal betamethasone (or dexamethasone) if <34 weeks — most important intervention
2. Surfactant replacement therapy (beractant/poractant alfa) — via ETT; give as early as possible
3. Respiratory support: CPAP → intubation + mechanical ventilation
4. INSURE technique: INtubation → SURfactant → Extubation to CPAP

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SAQ 4: Neonatal Jaundice

Classification:

• Physiological jaundice
• Pathological: Hemolytic disease (ABO/Rh), G6PD, Crigler-Najjar, breast milk jaundice, hypothyroidism

• Direct bilirubin >2 mg/dL AND >10% of TSB
• Causes: Biliary atresia, neonatal hepatitis, TORCH, sepsis, metabolic disease

Physiological vs. Pathological:

Kernicterus (Bilirubin Encephalopathy):

• Unconjugated bilirubin crosses the BBB → deposits in basal ganglia, cerebellum, brainstem
• Acute phase: Lethargy/hypotonia → hypertonia, high-pitched cry, opisthotonos, seizures
• Chronic phase (survivors): Choreoathetoid cerebral palsy, sensorineural hearing loss, upward gaze palsy, dental dysplasia

Management:

• Phototherapy: Converts bilirubin to water-soluble lumirubin (no conjugation needed)
• Exchange transfusion: Replaces 85% of circulation; use UAC + UVC; aliquots of 15 mL; pre-exchange: blood type, Coombs, bilirubin, glucose, Ca²⁺, CBC

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SAQ 5: Neonatal Sepsis

• GBS-positive vaginal swab
• Prolonged rupture of membranes (>18 hours)
• Maternal fever/chorioamnionitis
• Prematurity, fetal distress

• Temperature instability (fever ≥38°C or <36.5°C)
• Lethargy, irritability, seizures
• Apnea, tachypnea, grunting
• Poor feeding, vomiting, abdominal distension
• Jaundice, petechiae

• CBC + differential, CRP, procalcitonin
• Blood cultures ×2
• Lumbar puncture (CSF analysis + culture)
• Urine culture (LOS)
• CXR if respiratory symptoms

• EOS: Ampicillin + Gentamicin IV
• LOS (community): Ampicillin + Gentamicin
• LOS (NICU/hospital): Vancomycin + Gentamicin (or Cefotaxime)
• Duration: Bacteremia = 10 days; Meningitis = 14–21 days

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SAQ 6: Necrotizing Enterocolitis (NEC)

• Prematurity (main risk; peak at 30–32 weeks GA)
• Formula feeding (breast milk is protective)
• Gut ischemia / hypoxia
• Bacterial colonization
• Hyperosmolar feeds

• Systemic: Temperature instability, apnea, lethargy, cardiovascular collapse
• Abdominal: Distension, tenderness, erythema of abdominal wall, bilious vomiting, bloody stools

• Stage I–II: NPO, NGT decompression, IV antibiotics (Ampicillin + Gentamicin ± Metronidazole), TPN, serial AXRs
• Stage III: Surgical consultation → peritoneal drain or laparotomy + bowel resection
• Complication: Short bowel syndrome

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SAQ 7: Infant of Diabetic Mother (IDM)

• Maternal hyperglycemia → fetal hyperglycemia (glucose crosses placenta)
• Fetal pancreatic β-cell hypertrophy → fetal hyperinsulinism
• At birth, maternal glucose supply cut off → neonatal hypoglycemia (insulin remains high)

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SAQ 8: Intraventricular Hemorrhage (IVH)

• The germinal matrix (subependymal) is highly vascular and fragile in preterm infants
• Fluctuations in cerebral blood flow → rupture of thin-walled germinal matrix vessels
• Blood flows into the lateral ventricles

• Post-hemorrhagic hydrocephalus (Grade III/IV) → serial LP or ventriculoperitoneal shunt
• Periventricular leukomalacia (PVL)
• Cerebral palsy, cognitive impairment, developmental delay
• Grade III/IV → worst neurological prognosis

• Antenatal corticosteroids
• Indomethacin prophylaxis (controversial)
• Avoid rapid IV fluid boluses
• Delayed cord clamping

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SAQ 9: TORCH Infections

Memory aid: CMV = Calves (periventricular), Toxo = Tiny (diffuse) calcifications; CMV most Common, HSV most Hazardous

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SAQ 10: Neonatal Hyperbilirubinemia — Phototherapy & Exchange Transfusion

Phototherapy:

• Light (wavelength 460–490 nm, blue spectrum) converts unconjugated bilirubin in skin capillaries to water-soluble photo-isomers (lumirubin)
• Lumirubin excreted in bile and urine without hepatic conjugation

• Expose maximal skin surface area
• Eye protection (phototherapy goggles)
• Monitor hydration (increased insensible water loss)
• Monitor TSB every 4–12 hours while on phototherapy
• "Bronze baby" syndrome — occurs if phototherapy given to infant with conjugated hyperbilirubinemia

Exchange Transfusion:

1. TSB at or above the exchange transfusion threshold on nomogram
2. TSB ≥5 mg/dL above the exchange line
3. Signs of acute bilirubin encephalopathy (hypertonia, arching, opisthotonos, fever, high-pitched cry)
4. Failure of intensive phototherapy

• Double-volume exchange (2 × 80 mL/kg = ~160 mL/kg)
• Route: Remove blood via UAC; infuse via UVC
• Aliquots of 15 mL (term); 2–3 mL/kg/min (preterm)
• Replaces ~85% of infant's blood volume

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SAQ 11: Patent Ductus Arteriosus (PDA)

• "Continuous machine-like murmur" — left infraclavicular area
• Bounding peripheral pulses, wide pulse pressure
• Tachycardia, tachypnea, respiratory distress
• Hepatomegaly (heart failure)
• Pulmonary congestion on CXR

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SAQ 12: Meconium Aspiration Syndrome (MAS)

1. Mechanical obstruction — ball-valve effect → air trapping, hyperinflation, pneumothorax
2. Chemical pneumonitis — bile acids and enzymes cause inflammatory lung injury
3. Surfactant inactivation — worsens atelectasis
4. PPHN — hypoxia + acidosis → pulmonary vasoconstriction

• Meconium-stained amniotic fluid at delivery
• Respiratory distress from birth
• Barrel chest (hyperinflation)
• CXR: Patchy asymmetric opacities + hyperinflation + possible pneumothorax

• Do NOT routinely suction or intubate at delivery (even nonvigorous — current NRP guidelines)
• Supportive: Supplemental O₂, CPAP, mechanical ventilation as needed
• Surfactant replacement for severe cases
• iNO (inhaled Nitric Oxide) for associated PPHN
• ECMO if refractory

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📌 QUICK REVISION — MUST-KNOW ONE-LINERS

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