Echocardiographic findings in pulmonary immaturity in premature infants

The main cause of morbidity in preterm and premature infants remains pulmonary pathology. Among the features of the bronchopulmonary structures of premature and immature preterm infants is a lag in the development of the arterial network from the venous one. Small and medium arteries have narrow lumen and thick muscle mass. When the lungs are unfolded, an obstacle is created for rapid blood flow in the small circle of circulation, which results in delayed unfolding of the alveoli.