My Grandson Had An Echo Done. He Just Started College,

my grandson had an echo done. He just started college, but had the echo because of chest pains daily. Abnormalities found were elevated right atrial pressure or a persistent left superior vena cava and the dilated inferior vena cava demonstrates poor inspiratory collapse , consistent with elevated right atrial pressure.trace mitral and pulmonary valve regurg. the pulmonary artery is mildly diated. The inferior vena cava was dilated, with respiratory size variation greater than 50%. What does this mean?