dr. steven nicen, featured in the film. and also with dr.effrey marshal, a leading cardiologist whose specialty is implanting stents. >> doctor, let me start with you. you say there is a lot of yvonnes out there, the patient we just met. a lot of unnecessary stents. you say they don't prevent heart attacks, they don't lengthen life. >> the problem is, if you have stable chest pain, we have very good studies dating back a number of years that show that getting a stent will not prevent a heart attack and will not make you live longer. these are techniques that should be used to relieve symptoms. and some people even that are getting stents don't have symptoms. they have a blockage not causing symptoms, and yet they're actually having a procedure. >> are a lot of these stents unnecessary? >> i don't believe so. actually, about 70% of all angie owe plasty and stent procedures in this country are done in people actively having heart attacks, okay? large heart attacks or kind of smaller heart attacks or having what we call unstable an jina, chest