My 14 yr old son has a low pulse rate.His resting is about 35- 42bpm. His left ventricle is enlarged and thick but on the high side of normal. His septum measures 12 mm. He is seeing a pediatric cardiologist. She is unsure of the cause.. We discovered his bradycardia when he became ill from bad stomach virus last June. He had a CT scan also in June that showed his liver and spleen were also enlarged but on the high side of normal. This was associated with the bad virus and the heart was treated as something separately. I now wonder if the enlarged liver, spleen and heart are connected? My son is not physically active enough to fit with "athlete's heart" diagnosis. I am taking him to pediatrician tomorrow and ask that he have his spleen and liver looked at again. I know that if they are...sympton of hypertrophic cardiomyopathy. His cardiologist wants to see him again in 6 months. If everything is same or worse, she will restrict physical activity for 3 months and echo him again. Is there another test or something else I can do besides wait? Should I get a 2nd opinion?