Patent Ductus Arteriosus: The Daily PANCE Blueprint
A 32-week gestational age premature infant in the NICU is noted to have a continuous "machinery-like" murmur best heard at the left upper sternal border. The infant shows signs of increased work of breathing, poor feeding, and has been difficult to wean from oxygen support. An echocardiogram confirms the suspected diagnosis. What is the first-line medical treatment for this condition?
A. Prostaglandin E1
B. Indomethacin
C. Surgical ligation
D. Observation only
E. Furosemide
Answer and topic summary
The answer is Indomethacin
Patent Ductus Arteriosus (PDA) occurs when the ductus arteriosus fails to close after birth, creating a left-to-right shunt with increased pulmonary blood flow.
Indomethacin is a non-selective NSAID that inhibits cyclooxygenase (COX) enzymes, decreasing prostaglandin synthesis. Since prostaglandins maintain ductal patency, reducing prostaglandin levels promotes ductal closure. Administered intravenously in three doses over 24-48 hours with 70-80% success rates in premature infants. Most effective when given within the first week of life.
Clinical Pearls:
- Indomethacin CLOSES the PDA; Prostaglandin E1 KEEPS it OPEN – remember “Indo = In-Close”
- Contraindications to indomethacin: renal dysfunction, thrombocytopenia, bleeding, NEC
- Monitor during treatment: renal function, urine output, platelets, GI tolerance
- Alternative: Ibuprofen has fewer renal side effects
- If medical management fails: consider repeat indomethacin course or surgical ligation
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Smarty PANCE Content Blueprint Review:
Covered under ⇒ PANCE Blueprint Cardiology ⇒ ⇒
Also covered as part of the Pediatric Rotation topic lists
