BACKGROUND	The purpose of the Vascular Basis for the Treatment of Myocardial Ischemia study is to determine whether aggressive lowering of LDL cholesterol level with atorvastatin , with or without supplemental antioxidant vitamins C and E , can improve endothelial function and ischemia during ambulatory electrocardiogram ( AECG ) monitoring and exercise treadmill testing ( ETT ) .\