title: Transfusion practices for elective orthopedic surgery.
abstract: BACKGROUND
  Use of blood conservation techniques in elective surgery reduces the risk of infection and transfusion reactions that result from using allogeneic blood products. We examined the transfusion practice and blood conservation strategies for elective orthopedic procedures in 19 Canadian hospitals.
  
  
  METHODS
  We reviewed the medical records of patients who underwent total hip or knee joint arthroplasty between June 1998 and January 1999 in a convenience sample of 19 hospitals to determine the pre- and postoperative hemoglobin concentrations, concurrent medical conditions, participation status in an autologous blood donation program, use of other blood conservation techniques, and occurrence of allogeneic and autologous transfusions. Patients were considered eligible for autologous blood donation if they weighed at least 25 kg, were in good general health without major cardiac conditions and had a hemoglobin concentration of at least 110 g/L.
  
  
  RESULTS
  We reviewed 4535 medical records. Of the 4422 patients whose eligibility status was known, 2561 (57.9%) were eligible to participate in an autologous blood donation program. Only 842 (18.6%) of the patients predonated blood. Patients who did not predonate blood were older (mean age 70.1 v. 63.8 years) and were more likely to have concomitant medical conditions (60.3% v. 37.9%) than those who did predonate. Overall, 30.6% (95% confidence interval [CI] 29.1%-32.1%) of the patients who did not predonate blood received allogeneic transfusions. For patients who predonated, the rate of allogeneic transfusion was 14.1% (95% CI 11.8%-16.5%). The frequency with which blood conservation techniques other than autologous blood donation were used was minimal (in 2.4% of all cases).
  
  
  CONCLUSIONS
  The use of blood conservation techniques among hospitals in Canada remains low. Only a minority of eligible patients participated in an autologous blood donation program.
authors.affiliation: Department of Epidemiology and Biostatistics, London Clinical Trials Research Group, John P. Robarts Research Institute, Ont.
authors.forename: Brian G
authors.initials: BG
authors.lastname: Feagan
authors.forename: Cindy J
authors.initials: CJ
authors.lastname: Wong
authors.forename: William C
authors.initials: WC
authors.lastname: Johnston
authors.forename: Ramiro
authors.initials: R
authors.lastname: Arellano
authors.forename: Nigel
authors.initials: N
authors.lastname: Colterjohn
authors.forename: Keyvan
authors.initials: K
authors.lastname: Karkouti
authors.forename: Kim
authors.initials: K
authors.lastname: Turner
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement; D001803:Blood Transfusion / Q000592:standards / Q000706:statistics & numerical data*; D001804:Blood Transfusion, Autologous / Q000706:statistics & numerical data; D002170:Canada; D003661:Decision Support Techniques; D017558:Elective Surgical Procedures; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors