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A 21-year-old male asked:

Why coarctation of aorta in infantile, cause passes of the blood from pulmonary artery to the aorta through pda?

4 doctor answers9 doctors weighed in
Dr. Creighton Wright
General Surgery 56 years experience
Other: Blood flows from higher pressure to lower pressure. Aorta higher, pa lower usually. Coarctation distal to PDA cause higher aortic pressure spikes with obstruction and higher pa flow from aorta to pa through the pda-patent ductus arteriosus.
Dr. Alex Golden
Dr. Alex Golden commented
Pediatric Cardiology 22 years experience
This is easy to confuse, but coarctation almost always occurs *proximal* to the PDA, and so if the the coarctation is severe, the PDA is the only way for the body to get decent flow to the descending aorta. Thu,s the PDA generally is right-to-left or PA to Ao.
May 29, 2013
Dr. Calvin Weisberger
Cardiology 51 years experience
Coarctation : The narrowed aorta causes a lower pressure beyond the narrowing which allows flow from the PDA into the aorta.
Dr. Marc Levine
Pediatric Cardiology 49 years experience
Ductal dependence: Coarctation is usually associated with a small ao arch and/or aortic stenosis. If this is the case, the only way blood can get to the body (or systemic circulation) is thru the pda. The PDA is often associated with the coarctation and the narrowing may worsen as the PDA closes. This is why the coarctation may be "ductal dependent".
Dr. Sarosh Batlivala
Pediatric Cardiology 16 years experience
Plumbing!: Blood must get to the body, else the fetus would not survive. The same is true once the baby is born. In utero, blood flows from pulm artery (pa) to aorta (ao) normally. Once born, the blood continues to flow this way so that blood can get to the body. When the PDA closes, the child becomes very sick.

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