In 2006, Americans spent at least $14 billion on procedures involving coronary stents - little tubes that open clogged arteries to the heart. But according to the FDA, there's no evidence that stents significantly reduce the risk of future heart attacks. Now, a major study from a top cardiologist is suggesting that many of the procedures prescribed for chest pains are overused. NOW investigates the facts behind coronary procedures and finds - to no surprise - that money is as much an issue as medicine.

"There's no question that coronary intervention is big business. There is a lot of money involved in this,"researcher Dr. James Ferguson tells NOW.  "And this gets everybody very nervous. And very upset. And very passionate."

With big medical device makers so vested in the sale and marketing of their equipment, are some putting profits above patients?

The NOW Web site at www.pbs.org/now will provide additional coverage starting Friday, June 8, 2007. Features include the full text of the research study and tips on keeping your own heart healthy.