The pathology is one of a vicious circle. Hypoxia acts to keep the ductus arteriosus open and thus to maintain the fetal type circulation. The hypoxia also causes constriction of the pulmonary artery, and thus increases pulmonary hypertension.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.