A new study suggests defibrillators implanted in the chests of heart attack patients could save as many as nine-thousand lives over two years. The battery-powered devices fire automatically whenever they detect dangerously abnormal heartbeats. The report in the "New England Journal of Medicine" indicates they could cut the risk of death in half for the 65-thousand Americans who survive heart attacks every year. Critics say the study was financed by the defibrillator manufacturer -- St. Paul-based CPI/Guidant Corporation -- and that the device should be used only in survivors with the highest risk of death by cardiac arrest. In a moment, we'll talk about the ethics, but first we'll hear from someone who implants defibrillators.