Patent ductus arteriosus

 

During fetal circulation blood is shunted from aorta to pulmonary artery or vice versa. At birth this duct called the ductus arteriosus is blocked due to local prostaglandin E synthesis  and muscular contraction within 1-2 days of postnatal life. If this does not happen, then the duct becomes permanent or persistent. It presents with continuous murmur which goes on through systole and diastole.

 

Normal process at birth

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