Bronchopulmonary Dysplasia (BPD) is the most common respiratory disorder that affects chronically preterms with immature lungs. On this base it seems very pressing to investigate the effects of BPD also in preschool children to assess the frequency of respiratory disease and the cardiovascular impact, focusing on functional study of right ventricle whose parameters can be used as an index of bronchopulmonary impairment. The population study take account of 105 premature born between during 2008 in January and 2012 in December with GA<33 week; BW<1800gm. No malformations or surgeries. The echocardiography study has evaluated: L Ventricular Ejection Fraction (EFVS %); Tricuspidal Annular Plane Systolic Excursion (TAPSE); Pulmonary Artery Pressure (PAP); Right Ventricle Isovolumic
