In addition to the glucose data, administration of all insulin and other medications likely to affect blood glucose levels or perfusion status will be recorded as will all infusions containing dextrose, including parenteral nutrition and all enteral feeding. All other clinical events such as return trips to the operating room, or development of a new infection, or new organ failure, will be recorded by the investigative team. Additional data collected will include age, gender, race, prior medical history, reason for SICU admission, medications during the study and prior, complications, days on mechanical ventilation, length of stay, daily vital signs, including weight and any vital sign abnormalities, body mass index, liver failure, renal failure and use of renal replacement therapy. If a patient develops a skin reaction to the device or the adhesive maintaining the device, it will be removed and a new site will be employed if possible with tape replacing the standard transparent dressing.