unblock an artery. and they put a catheter up into the artery and unblock it sometimes with a balloon. but ultimately you can put this stint in place, you're particular with this, you've seen this. it's sort of more permanent fix and sometimes these stints will release medication, as well. >> i have seen studies that these are kind of -- people say they're overused, that they don't reduce heart death by any appreciable amount. >> if you look at the question do people live long we are stints, you're probably right. part of it is that people may live a higher quality of life, not have chest pain or some of the symptoms associated with heart disease. but usually they're associated with people having an active problem. again, when you read this release from president bush's