The right ventrical of the heart
pumps blood to the lungs, the left to the rest of the body. If you are athletic it is a good thing, as this is normal. If not, it can be caused by high blood pressure, or a heart injury. You should always sit down with your doctor and not leave until you understand everything on the report in layman's terms. Also, it says "probable" I would want to know for sure. Are you seeing a cardiologist? If not, do so.