Which of the following is a stimulus for closure of ductus arteriosus?
Increased O2 tension
Hypoxia
Prematurity
Hypercapnia
a. Increased O2 tension(Ref: Nelson's 20/e p 2162)In the course of several days after birth, the high arterial Po2 constricts and eventually closes the ductus arteriosus, which eventually becomes the ligamentum arteriosum
C.V.S.