Surfactant secreted in lung at gestation age of?

الشرح

Core Concept: Pulmonary surfactant is a complex mixture of lipids and proteins produced by Type II pneumocytes that reduces alveolar surface tension, preventing lung collapse. Its production is a critical milestone in fetal lung maturity.

Clinical Presentation:

• N/A (Fetal physiology).

Diagnosis:

• *First-line:* Obstetric ultrasound for gestational age dating.
• *Gold Standard:* Amniocentesis for Lecithin/Sphingomyelin (L/S) ratio or Phosphatidylglycerol (PG) if fetal lung maturity must be confirmed.

Management:

• *Acute:* Recognize that surfactant production begins around *24 weeks* of gestation, though it does not reach adequate levels to prevent Respiratory Distress Syndrome (RDS) until about 34-36 weeks.
• *Definitive:* Administer antenatal corticosteroids (e.g., betamethasone) to mothers at risk of preterm delivery between 24 and 34 weeks to accelerate surfactant production and fetal lung maturation.