Hello. Thank you for your question and welcome to HCM. I carefully read your query. The something that was told to you, is probably the ejection fraction of the left ventricle of the heart. It is a component that describes heart function and, if it is 0.6 or 60%, then it means that this heart fills, pumps and contracts properly (normal ranges being 0.55-0.7, or 55-70%). Stress itself produces produces rapid heart rate and high blood pressure, almost always. This is attributed to high levels of adrenalin and noradrenalin in your system, during stress. Also, long-standing stress exposes the heart to a hyperdynamic state, which can also produce the so-called innocent murmurs . I am stating this, because if it was a pathological murmur, it would be diagnosed on the careful echocardiogram examination of the valves and other structures of the heart, which can produce murmurs. You may also have white coat syndrome, and you may also not have high blood pressure (hypertension), but if this is a long-standing high blood pressure then, combined with your age of 66 years old, I cannot exclude the diagnosis of hypertension, at this moment. A 24-hour blood pressure monitor would be a good approach at this moment, to precisely confirm or exclude hypertension and, if confirmed, proper treatment should be initiated immediately, to control these blood pressure figures and keep them under 140/90 mmHg. I hope I was helpful with my answer. Feel free to ask again. Best regards. Dr. Meriton