For patients in the throes of a heart attack and those with crippling chest pain from even minor exertion, angioplasty and stents can be lifesaving. But studies have shown that putting stents in such patients is no more protective than following a heart-healthy lifestyle and taking medication and, if necessary, nutritional supplements to reduce cardiac risk. The studies have also shown that stents sometimes make matters worse by increasing the chance that a dangerous clot will form in a coronary artery.