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NBME Step 2 CK Form 8 Answers
Is the patent foramen ovale required for this? Apparently it stays open for 6 months to a year. Because otherwise I can't understand how the PDA distal to the coarctation would be helpful. So does PFO then PDA help divert LA blood into the descending aorta? According to UTD: "During the neonatal period, when the PDA and foramen ovale (between the right and left atria) begin to close, the cardiac output that must cross the narrowed aortic segment to reach the lower extremities steadily increases."
Agreed! This is worded so badly, and is so classic NBME! I guess it couldn't have been the others because increase in peripheral vascular resistance isn't technically counted as the aorta.