It is like sonography of heart. It tells us about pumping of the heart, functioning of valves and similar vital information. It cannot detect blocks, however if someone has suffered a major heart attack it will become abnormal . It can detect silent heart attacks & especially useful in diabetics & hypertensives who can develop weakness of heart even without blockages [ Diabetic & Hypertensive Cardiomyopathy] . Cardium has a high end machine with advanced features.