the possibly associated cardiac malformations , the persistance of fetal obstructive hypertension due to the increase of the flow in the left pulmonary artery , the left to right shunt induced by the abnormal venous return and predominantly by the systemic blood supply to the right lung , are responsible , at various degrees , for pulmonary hypertension .
C0020538
hypertension
C0020542
pulmonary hypertension