title: The relationship between glycosylated hemoglobin and perioperative glucose control in patients with diabetes.
abstract: OBJECTIVE
  Hyperglycemia and elevated glycosylated hemoglobin (HbA(1c)) are associated with perioperative morbidity in patients with diabetes, but the relationship between long-term glycemic control and perioperative glucose control is unknown. The purpose of this study was to determine the relationship between glycosylated hemoglobin (HbA(1c)) and perioperative glucose in fasting patients with type 2 diabetes undergoing elective non-cardiac surgery.
  
  
  METHODS
  This was a prospective observational study of 244 adult patients with type 2 diabetes who were evaluated before elective non-cardiac surgery at a preoperative medicine clinic in a tertiary care medical centre during the period September 2004 to May 2005. Preoperative HbA(1c) levels were determined, and preoperative and postoperative glucose values were measured on the day of surgery. The primary outcome variables were preoperative and postoperative blood glucose values.
  
  
  RESULTS
  Half of all study patients had an HbA(1c) > or = 7%, including 23% of patients with HbA(1c) >/= 8%. HbA(1c) levels predict preoperative glucose levels, and preoperative glucose levels and duration of surgery predict postoperative glucose levels. Glucose levels in one-third of the patients with type 2 diabetes decreased during surgery without administration of insulin or glucose-regulating medications.
  
  
  CONCLUSIONS
  HbA(1c) values may serve as biomarkers for glucose control during the immediate perioperative period in patients with type 2 diabetes undergoing elective surgery.
authors.affiliation: Department of Anesthesiology and Critical Care, University of Chicago, Chicago, IL, USA. vm2161@columbia.edu
authors.forename: Vivek K
authors.initials: VK
authors.lastname: Moitra
authors.forename: Jason
authors.initials: J
authors.lastname: Greenberg
authors.forename: Srikesh
authors.initials: S
authors.lastname: Arunajadai
authors.forename: BobbieJean
authors.initials: B
authors.lastname: Sweitzer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001786:Blood Glucose / Q000032:analysis*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood*; D017558:Elective Surgical Procedures; D005215:Fasting / Q000097:blood; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D019990:Perioperative Care / Q000379:methods*; D011446:Prospective Studies
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin