0 Duct dependant heart defects

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Duct dependant heart defects

i.e - good with Patent ductus arteriosus but deteriorates with its closure

 Left Sided Lesions : (depend on ductus for systemic blood flow) 

• Congenital AS
• Coarctation of Aorta
• Interrupted Aortic Arch
• Hypoplastic Left heart syndrome

if ductus closes - Presents as Shock

Therefore give Prostaglandins infusion (PG E1)

 Severe Right Sided Lesion (Depend on ductus for pulmonary blood flow) 

i.e After birth - blood flow to lungs only if Ductus is open - if closes then Cyanosis. 

• Critical PS
• Tricuspid Atresia
• Tetrology of fallot

 TGA i.e Aorta from right and pulmonary trunk from left 

Thus systemic circuit will have only unoxygenated blood

and Pulmonary circuit will have only oxygenated blood

thus it depends on Ductus for Oxygen.

Note : Truncus Arteriosus (i.e Pulm Art and Aorta are 1) is ductal independant.

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