Neonatal Respiratory Care

Master RDS, BPD, PPHN, surfactant therapy, and neonatal ventilation strategies.

advanced90 min estimated3 lessons

Respiratory Distress Syndrome (RDS)

Neonatal RDS (also called hyaline membrane disease) results from surfactant deficiency in premature lungs. Surfactant reduces alveolar surface tension, preventing collapse at end-expiration.

Risk factors: prematurity (<36 weeks, especially <28 weeks), maternal diabetes, C-section without labor, male sex, second twin. Protective factors: antenatal corticosteroids (betamethasone 2 doses 24h apart), PROM, maternal hypertension.

Clinical signs (onset within 4–6 hours of birth): tachypnea, grunting, nasal flaring, intercostal/subcostal retractions, cyanosis. CXR: diffuse ground-glass appearance, air bronchograms, low lung volumes.

Treatment: exogenous surfactant, CPAP (first-line), mechanical ventilation if severe. Target SpO2 90–95% in premature infants.

RDS from surfactant deficiency — primarily affects <36 weeks gestation
Antenatal betamethasone reduces RDS severity and mortality (given ≤34 wks)
CXR: ground-glass opacities, air bronchograms, low lung volumes
Surfactant replacement: natural > synthetic; give via ET tube
CPAP is first-line for mild–moderate RDS; reduces need for intubation (INSURE technique)

Clinical tip

The INSURE technique (INtubate, SURfactant, Extubate to CPAP) allows surfactant delivery while minimizing mechanical ventilation exposure.

PPHN: Persistent Pulmonary Hypertension of the Newborn

PPHN is failure of normal postnatal pulmonary vascular resistance (PVR) reduction. PVR stays elevated, causing right-to-left shunting through the foramen ovale and ductus arteriosus, producing profound hypoxemia.

Causes: meconium aspiration syndrome (MAS), perinatal asphyxia, sepsis, idiopathic, CDH (congenital diaphragmatic hernia).

Diagnosis: differential SpO2 (pre-ductal vs post-ductal difference >10%); echocardiography confirms.

Treatment: optimize oxygenation and ventilation (avoid acidosis and hypoxia — both increase PVR); inhaled nitric oxide (iNO) 20 ppm is gold standard selective pulmonary vasodilator; sildenafil for persistent cases; ECMO for refractory PPHN.

PPHN: elevated PVR → right-to-left shunt → hypoxemia
Pre/post-ductal SpO2 difference >10% = ductal-level right-to-left shunt
Avoid hypoxia and acidosis — both increase PVR and worsen PPHN
iNO 20 ppm: selective pulmonary vasodilator, gold standard for PPHN
Wean iNO gradually — rebound PHTN if stopped abruptly

Clinical tip

In PPHN, the right radial artery gives pre-ductal SpO2 and the umbilical artery/left hand gives post-ductal SpO2. Difference >10% is significant.

Neonatal Ventilation Strategies

Neonatal ventilation requires lower volumes and higher rates than adults. Key principles: avoid volutrauma (Vt 4–6 mL/kg), keep Pplat <28–30, use adequate PEEP (4–6 cmH2O).

HFOV (high-frequency oscillatory ventilation): uses very small Vts (~1–3 mL/kg) at 10–15 Hz. The mean airway pressure (MAP) controls oxygenation; amplitude (ΔP) controls CO2 removal. Ideal for RDS, air leak syndromes, PPHN as rescue.

HFJV (high-frequency jet ventilation): used primarily for PIE (pulmonary interstitial emphysema) and bronchopleural fistulas — very low Vts minimize air leak.

Apnea of prematurity: treated with caffeine citrate (first-line) and CPAP/NIPPV.

Neonatal Vt: 4–6 mL/kg; higher rates 40–60/min; PEEP 4–6 cmH2O
HFOV: MAP controls oxygenation; amplitude (ΔP) controls CO2
HFJV: primary indication is PIE and bronchopleural fistula
Caffeine citrate: first-line for apnea of prematurity
Target SpO2 90–95% in preterm to minimize ROP risk

Clinical tip

On HFOV, if CO2 is high, increase amplitude (ΔP). If oxygenation is poor, increase MAP. Remember: the oscillations you see chest-wiggling = adequate CO2 removal.

Clinical cases

27-Week Premature Infant with RDS

27-week EGA infant born via emergency C-section. Apgar 4/6. Grunting, RR 70, retractions, SpO2 75% on 100% blowby O2. CXR shows diffuse ground-glass with air bronchograms and small lung volumes.

What is the diagnosis and what are the immediate management priorities?

RDS from surfactant deficiency. Immediate: stabilize with CPAP or intubation, administer surfactant, target SpO2 90–95%.

Classic RDS presentation: premature, early onset respiratory distress, ground-glass CXR. CPAP 5–7 cmH2O is first-line; if work of breathing is severe or FiO2 >0.4 on CPAP, intubate and give surfactant (INSURE technique preferred). Target SpO2 90–95% — avoid >96% to prevent ROP.

Know this for NBRC

RDS: surfactant deficiency, preterm, ground-glass CXR
PPHN: right-to-left shunt, pre/post-ductal SpO2 difference >10%
iNO 20 ppm for PPHN; wean gradually
HFOV: MAP controls O2; amplitude controls CO2
Caffeine for apnea of prematurity
SpO2 target preterm: 90–95% (ROP prevention)

Key facts

RDS: surfactant deficiency, <36 weeks, CXR ground-glass + air bronchograms
Antenatal betamethasone given at 24–34 weeks to reduce RDS/IVH risk
Surfactant dose: 100–200 mg/kg via ET tube (depends on preparation)
PPHN: pre-ductal SpO2 (right hand/ear) vs post-ductal (left hand/foot) >10% difference
iNO dose: 20 ppm for PPHN; wean by 5 ppm when FiO2 <0.60
SpO2 target in preterm: 90–95% (lower to prevent ROP)
HFOV: MAP controls oxygenation; ΔP controls CO2 removal
Caffeine citrate: loading 20 mg/kg IV, maintenance 5–10 mg/kg/day for AOP
CDH (congenital diaphragmatic hernia): avoid high PIPs, permissive hypercapnia
BPD (bronchopulmonary dysplasia): oxygen >28 days or at 36 weeks PMA

NBRC pearls

INSURE = INtubate, SURfactant, Extubate to CPAP — standard of care for RDS
iNO: 20 ppm for PPHN; must wean; monitor methemoglobin
HFOV: oxygenation by MAP; ventilation by amplitude — opposite of conventional
Apnea of prematurity: caffeine first; CPAP/NIPPV support

Memory tricks

PPHN: 'Persistent Problem: Heart Not normal' — right-to-left shunting persists
HFOV: 'MAP = O2, ΔP = CO2' — amplitude drives CO2 out
INSURE: INtubate, SURfactant, Extubate

Common mistakes

Using post-ductal SpO2 as the pre-ductal reading (right radial = pre-ductal)
Abruptly stopping iNO without weaning (causes rebound PHTN)
Excessive ventilation in CDH (causes contralateral lung overinflation)
Missing ROP risk by targeting SpO2 >96% in premature infants

Neonatal Respiratory Care

Respiratory Distress Syndrome (RDS)

PPHN: Persistent Pulmonary Hypertension of the Newborn

Neonatal Ventilation Strategies

Clinical cases

NBRC pearls

Memory tricks

Common mistakes

Related topics

Neonatal Respiratory Care

Respiratory Distress Syndrome (RDS)

PPHN: Persistent Pulmonary Hypertension of the Newborn

Neonatal Ventilation Strategies

Clinical cases

NBRC pearls

Memory tricks

Common mistakes

Related topics

Lessons

Respiratory Distress Syndrome (RDS)

PPHN: Persistent Pulmonary Hypertension of the Newborn

Neonatal Ventilation Strategies

Clinical cases

NBRC pearls

Memory tricks

Common mistakes

Related topics

Lessons

Respiratory Distress Syndrome (RDS)

PPHN: Persistent Pulmonary Hypertension of the Newborn

Neonatal Ventilation Strategies

Clinical cases

NBRC pearls

Memory tricks

Common mistakes

Related topics