SeeHeart & BloodFlow. Issues detectable by symptoms, stethoscope and/or ekg are limited; e.g. Most heart attacks & valve problems missed. Using us, 1-10 mhz, motion of the muscular chambers & blood flow become visible, measurements can be made & more issues evaluated. Us: safest of medical imaging techniques, yet quality very dependent on machine/tech/person/reader. Best always get video copies, read yourself & save.