<prompt> Anatomical closure of ductus aeriosus gets completed by:2 weeks4 weeks12 weeks16 weeks  <response>: 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 