Heparin in coronary artery disease: new uses for an old drug.

The role of heparin in the treatment of coronary artery disease remains unclear. Although of benefit in unstable angina and the prevention of acute occlusion following angioplasty, its value as adjunctive therapy in myocardial infarction is limited. Further studies are needed to assess the effect of heparin on angioplasty restenosis and late venous graft occlusion.