coarctation and rib notching

[surgok]

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Do you get rib-nothing in pre-ductal coarctation as well?
Also, I understand that PDA along with pre-ductal coarctation produce early lower extremity cyanosis. Does the DA remain patent due to decreased backpressure in the systemic circuit? or does it eventually close?

Thanks

 

[ketosisevangelist]