Known Large in Pediatrics — 6yo Child | Pediatric Cardiology | SMLE Q#12310
SMLE Question #12310
Pediatrics
Pediatric Cardiology
Objective: OBJ-283
Last updated: February 2026
A 6-year-old boy with a known large, untreated patent ductus arteriosus has 1 month of worsening shortness of breath and easy fatigability. He is now breathless after climbing one flight of stairs. On examination, he has central cyanosis, a prominent S3 gallop, and a continuous murmur over the left infraclavicular area. Which complication most commonly explains clinical deterioration in a child with a large untreated PDA?
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