Dr Henry Jefferson, Consultant Anaesthetist
#QuestionFeedback 12. Fetal Ductus Arteriosus What keeps the ductus arteriosus patent during fetal life? Two important factors are: • LOW fetal oxygen tension • HIGH prostaglandin E₂ activity Following birth, increasing oxygen tension and decreasing prostaglandin concentrations promote ductal constriction. Feedback highlighted that the original answer simply stated 'prostaglandin E₂' without specifying a HIGH concentration.