title: Reduction in requirements for allogeneic blood products: nonpharmacologic methods.
abstract: BACKGROUND
  Various strategies have been proposed to decrease bleeding and allogeneic transfusion requirements during and after cardiac operations. This article attempts to document the usefulness, or lack thereof, of the nonpharmacologic methods available in clinical practice.
  
  
  METHODS
  Blood conservation methods were reviewed in chronologic order, as they become available to patients during the perisurgical period. The literature in support of or against each strategy was reexamined critically.
  
  
  RESULTS
  Avoidance of preoperative anemia and adherence to published guidelines for the practice of transfusion are of paramount importance. Intraoperatively, tolerance of low hemoglobin concentrations and use of autologous blood (predonated or harvested before bypass) will reduce allogeneic transfusions. The usefulness of plateletpheresis and retransfusion of shed mediastinal fluid remains controversial. Intraoperatively and postoperatively, maintenance of normothermia contributes to improved hemostasis.
  
  
  CONCLUSIONS
  Several approaches have been shown to be effective. An efficient combination of methods can reduce, and sometimes abolish, the need for allogeneic blood products after cardiac operations, inasmuch as all those involved in the care of cardiac surgical patients adhere thoughtfully to existing transfusion guidelines.
authors.affiliation: Department of Anesthesia, Montreal Heart Institute, University of Montreal, Quebec, Canada.
authors.forename: J F
authors.initials: JF
authors.lastname: Hardy
authors.forename: S
authors.initials: S
authors.lastname: Bélisle
authors.forename: G
authors.initials: G
authors.lastname: Janvier
authors.forename: M
authors.initials: M
authors.lastname: Samama
mesh_terms: D000818:Animals; D016063:Blood Loss, Surgical; D001803:Blood Transfusion; D001804:Blood Transfusion, Autologous; D006348:Cardiac Surgical Procedures; D006488:Hemostasis, Surgical; D006801:Humans