title: [Evaluation of perioperative blood loss following total knee arthroplasty].
abstract: OBJECTIVE
  To evaluate perioperative occult blood loss following total knee arthroplasty (TKA).
  
  
  METHODS
  A retrospective analysis of 40 patients undergoing TKA was conducted to calculate the mean blood loss and occult blood loss according to Gross formula.
  
  
  RESULTS
  The mean total blood loss was 1538 ml in these cases with occult blood loss of 791 ml. In patients with autologous blood transfusion, the mean total blood loss was 1650 ml with occult blood loss of 786 ml. In patients without autologous blood transfusion, the mean total blood loss was 1370 ml with occult loss of 798 ml.
  
  
  CONCLUSIONS
  TKA often results in large volume of occult blood loss in the perioperative period which can not be fully compensated by autologous blood transfusion, and additional blood supply is needed for maintenance of the circulating volume.
authors.affiliation: Department of Orthopedics and Spinal Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. rogerwee@fimmu.com
authors.forename: Ji-wei
authors.initials: JW
authors.lastname: Luo
authors.forename: Da-di
authors.initials: DD
authors.lastname: Jin
authors.forename: Mei-xian
authors.initials: MX
authors.lastname: Huang
authors.forename: Hua
authors.initials: H
authors.lastname: Liao
authors.forename: Da-chuan
authors.initials: DC
authors.lastname: Xu
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D016063:Blood Loss, Surgical / Q000706:statistics & numerical data*; D001804:Blood Transfusion, Autologous; D005260:Female; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007431:Intraoperative Complications / Q000097:blood* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
chemical_list: D006454:Hemoglobins