TYPES OF COARCTATION OF THE AORTA

	Preductal	Postductal
Frequency	98%	2%
Level of obstruction	Between origin of left subclavian artery and ductus arteriosus	Distal to the ductus arteriosus (called ligamentus arteriosus when obliterated
Ductus arteriosus	Patent	Obliterated
Other cardiac anomalies	Common	Usually isolated May have aortic valve abnormalities
Presentation	Infants	Older children / adults

Most severe form of coarctation is Interruption of the Aortic Arch.