The aim of this study is to examine the effect of moderate glucose (blood sugar) control in diabetic and non-diabetic patients undergoing leg bypass surgery (LEB) or open abdominal aortic aneurysm (AAA) repair. We hypothesize that use of Fletcher Allen Health Care's current insulin infusion strategy will result in improved blood sugar control which will translate into decreased postoperative morbidity (fewer complications) and better long term outcomes when compared to patient outcomes at other institutions which utilize other blood sugar management strategies.