A 28-week gestation female neonate born to a mother with rupture of membranes presents with respiratory distress within 2 hours of birth. Chest X-ray shows a ground-glass appearance with air bronchograms. Which drug is the first-line treatment for respiratory distress syndrome in this preterm infant?
The clinical presentation—preterm birth at 28 weeks, respiratory distress within hours, and ground-glass appearance on CXR—is pathognomonic for Respiratory Distress Syndrome (RDS), caused by surfactant deficiency.
Drug of Choice: Poractant Alfa
Key Point
Poractant alfa is a natural (porcine-derived) surfactant and is the preferred first-line agent for RDS in preterm neonates. It is administered via endotracheal tube as an intra-pulmonary instillation.
Mechanism of Action
Surfactant replacement therapy works by:
1.
Reducing surface tension at the air-liquid interface in alveoli
2.
Restoring compliance and preventing alveolar collapse during expiration
3.
Improving gas exchange and oxygenation
Surfactant Preparations Available
Table
Agent
Type
Source
Dosing
Notes
Poractant alfa
Natural
Porcine lung
100–200 mg/kg/dose
Gold standard; most potent
Beractant
Natural
Bovine lung
100 mg/kg/dose
Effective; less potent than poractant
Calfactant
Natural
Calf lung
105 mg/kg/dose
Effective alternative
Lucinactant
Synthetic
Lab-synthesized
5.8 mL/kg/dose
Newer; less clinical experience
High-YieldNEET PG
Poractant alfa has the highest phospholipid concentration and superior clinical outcomes compared to other surfactants. It is the DOC in most NEET PG curricula and Indian neonatal units.
Timing and Administration
Timing: Administer as soon as RDS is diagnosed (within first 2 hours of life ideally)
Route: Endotracheal tube (requires intubation)
Repeat doses: May be given at 12 and 24 hours if respiratory support remains needed
Clinical Pearl
Surfactant replacement has reduced mortality and morbidity from RDS by ~40% since its introduction. Early administration (within 2 hours) yields better outcomes than delayed therapy.
Mnemonic
PALS = Poractant alfa, Antenatal steroids, Lung recruitment, Supportive care — the pillars of RDS management.
Contraindications & Precautions
Contraindicated in meconium aspiration syndrome (relative)
Monitor for transient hypoxemia during instillation
Requires mechanical ventilation capability
Nelson Textbook of Pediatrics 21e Ch 102
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