NBME 21

nbme21/Block 2/Question#5

A 2-week-old male newborn has a patent ductus ...

Higher than normal left ventricular cardiac output

Login to comment/vote.

 +1  upvote downvote
submitted by heavy_neighborhood(1),

PDA flows from the Aorta ==> Pulmonary arteries, by passing the RV so there is no change in O2 in the RV.


 +0  upvote downvote
submitted by moneysacs(0),

Why is does a PDA after birth result in "higher than normal left ventricular cardiac output" over increased "right ventricular PO2"? Does the pulm artery --> aorta shunt become reversed after birth, so higher oxygen aorta blood would flow back into the right ventricle? I get that more blood would be pumped to the left ventricle, resulting in RVH/LVH, but don't understand the O2 bit.