Purpose: Determine the influence of HbA1C on perioperative glycemia and hemodynamics in elderly patients with diabetes mellitus. Methods: This was a prospective observational study of 50 elderly patients with diabetes mellitus who were >60 years of age, ASA I - III, undergoing non-cardiac surgery with general anesthesia by intubation, performed at Nhan Dan Gia Dinh hospital during the period September 2012 to May 2013.