Having just got used to the fact that I have been SVT diagnosed, a few days ago, following an echocardiogram, I was told by the specialist that the right side of my heart is enlarged. He has advised me to cancel my holiday for this year and undergo several diagnostic tests. I have researched RVH and a lot of it doesn't look good. I really need to know how seriously to take all this, ie is this life threatening and should I be resting up? My mother died of cardiac failure in her mid fifties so am wondering if all this could be hereditary.