بقاء القناة الشريانية PDA

any time u talk about right to left shunts reversal you HAVE to say three things

1. pulomnary congestion
2. Pulmonary hypertension
3. right ventricular failure

i mean eisenminger syndrome

this has the priority to mentioning cyanosis , cuz cyanosis is the result , u can predict results if u plant the core

just a point of view ..

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NOTICE :

The mature infant process of closure is induced by prostaglandin and oxygen that stimulate muscular contraction in the duct wall

while in premature infant with RDS ( Respiratory distress syndrome ) at birth hypoxemia keeps the duct open

while in full term infant with PDA there may be a true structural defect in the wall

I mean : in premature hypoxemia stimulates PDA while in full term PDA its structural defect in the wall not hypoxemia

sometimes PDA could be the cause of the coarctaion of aorta
:
in such abnormal cases there is unusual quantity of ductus arteriosus muscle tissue in the wall of the aorta .before the fibrosis when ductus arteriosus contracts ,ductal muscle in the wall of aorta contracts which leads to narrowing of its lumen,later ,when the fibrosis of the ductus arteriosus takes place ,the wall of aorta involves in, that which leads to permanent narrowing....