title: Hydroxyethyl starch and change in renal function in patients undergoing coronary artery bypass graft surgery.
abstract: BACKGROUND
  Several case reports and clinical lore have suggested that exposure to the colloid hydroxyethyl starch may impair renal function, but few studies have systematically addressed this issue, and several have produced conflicting results. We sought to study the question in a formal analysis of postoperative change in renal function in patients undergoing coronary artery bypass graft (CABG) surgery.
  
  
  METHODS
  We identified 238 consecutive patients who underwent CABG surgery at a large academic medical center. Glomerular filtration rate (GFR) was estimated using the Cockroft-Gault formula at baseline as well as on postoperative days 3 and 5. Linear regression analysis was used to study the relation between changes in GFR and intraoperative hydroxyethyl starch administration. Multivariate models controlled for potential demographic, clinical, and surgery-related confounders.
  
  
  RESULTS
  Hydroxyethyl starch use was independently associated with a reduction in GFR on both postoperative days 3 and 5, with GFR declining by 7.2 mL/min/1.73 m2 on day 3 per unit of hydroxyethyl starch administered (95% CI, 1.7 to 12.7; P = 0.012), and by 6.6 mL/min/1.73 m2 on day 5 (95% CI, 1.2 to 11.9; P = 0.018).
  
  
  CONCLUSIONS
  Intraoperative use of hydroxyethyl starch may be associated with modest impairment in renal function in patients undergoing CABG surgery. Randomized clinical trials will be necessary to confirm these findings and to further investigate their clinical implications.
authors.affiliation: Division of Pharmacoepidemiology and Pharmacoeconomics, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. wolfgang@post.harvard.edu
authors.forename: Wolfgang C
authors.initials: WC
authors.lastname: Winkelmayer
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Glynn
authors.forename: Raisa
authors.initials: R
authors.lastname: Levin
authors.forename: Jerry
authors.initials: J
authors.lastname: Avorn
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001026:Coronary Artery Bypass; D004305:Dose-Response Relationship, Drug; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D006895:Hydroxyethyl Starch Derivatives / Q000008:administration & dosage / Q000627:therapeutic use*; D007430:Intraoperative Care; D007668:Kidney / Q000187:drug effects* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010952:Plasma Substitutes / Q000008:administration & dosage / Q000627:therapeutic use*; D012189:Retrospective Studies; D013997:Time Factors
chemical_list: D006895:Hydroxyethyl Starch Derivatives; D010952:Plasma Substitutes