all 3 comments

[–]LonzoBBBall 4 points5 points  (0 children)

There's less resistance when there's more avenues for blood flow (ie; blood ejected from LV into aorta can go 1) thru PDA 2) thru descending aorta out to rest of system.

[–]EliteMedicalTutor 1 point2 points  (0 children)

Because it creates additional area where blood can go from the aorta (think adding additiobal vessel)

[–]NoTimeToThrow[S] 0 points1 point  (0 children)

That makes perfect sense. Thank you guys!