This week, a flurry of studies presented at the American College of Cardiology meeting in New Orleans could have lasting implications for treatment of patients with heart problems. One report suggested lowering cholesterol levels far below the level that most doctors consider adequate can substantially reduce the risk of heart attacks. Another suggested implantable cardiac defibrillators -- or ICDs -- could prevent sudden death in patients with moderate heart problems. A third found that drug-coated coronary stents -- which have been used to unclog large heart arteries -- are showing promise in clearing tiny heart arteries as well. Last week Minnesota-based Boston Scientific received FDA approval to sell its drug-coated stent.