Persistent pulmonary hypertension of newborns is a persistence or return to the state of constriction of the arterioles of the lungs, which causes a significant decrease in blood flow in the lungs and the right venting of the blood. Symptoms and signs include tachypnea, the entrainment of malleable areas of the chest and pronounced cyanosis or a decrease in oxygen saturation that do not respond to oxygen therapy. The diagnosis is based on anamnesis, examination, radiography of the chest and response to the oxygen subsidy.