Anatomical closure of ductus aeriosus gets completed by:: (A) 2 weeks, (B) 4 weeks, (C) 12 weeks, (D) 16 weeks
Answer is C. Under normal conditions, the ductus aeriosus closes functionally contraction of its muscular valve. Anatomical closure usually completed by intimal proliferation and takes 1 - 3 months i.e. by 3 month / 12 weeks ductus aeriosus should not remain patent. A patent ductus aeriosus is one of the most frequently occurring abnormalities of the great vessels (8/ 10, 000 bih)