most are covered by a cap but ins uggla and stress can cause it to rupture and block the flow of blood to the heart. robbed of oxygen the heart muscle can't function properly. heart attack. therein lies the key. we can now find the clues before heart trouble gets dangerous even before the first symptoms. >> one of the best kept see krtss in i are really seei ing . it's doable. >> you're saying with what we know right now, we don't have to have any more heart attacks in this country. >> i've never say not any but the great majority rj yes, absolutely. >> it's the greatest killer in this country. >> and it's completely correctible. the liver sends out ldl level and when everything works good the good scarf venchs the rdl and turns it into adr. your there's troll number sa good measure of what's in the blood. here's what tale yos near it doesn't tell you. >> if you look the coronary attack units. those who don't very vest those who do are ee sep chalgly the same. >> that is essentially surprising because you'll hear people kb thank their numbers. you say you're not looking in the right pl