sentences:  Another source of controversy in the field of interventional cardiology is the overlapping roles of PCI and coronary artery bypass surgery for individuals with coronary artery disease.This area has been studied in a number of trials since the early 1990s.Unfortunately, due to the rapid changes in technique in both bypass surgery as well as PCI, added to the better understanding of the role of intense pharmacologic therapy in individuals with coronary artery disease, questions still remain on the best form of therapy in many subgroups of patients.