Over the course of a year, we had an echocardiogram done four times at…

Over the course of a year, we had an echocardiogram done four times at different clinics, with no abnormalities found. We have a commission every year, and we do EKGs to identify an enlargement of the right ventricle. Is this even possible? What further actions should be taken? Should we go for another echocardiogram and see a cardiologist again? Has anyone ever seen this enlargement in children? What is dangerous about it?