Abstract
Autotransfusion of unprocessed blood (AUB), either intraor postoperatively, represents the oldest and simplest method for own blood retransfusion. It includes collection by aspiration of blood from the surgical field, or from postoperative drains, in cardiothoracic and orthopedic operations, simple filtration of this blood and retransfusion, as opposed to processing the shed blood by centrifugation, applying more modern systems, and retransfusing washed red blood cells. During AUB, blood is collected by using low suction, is passed through filters with micropores with a diameter less than 170 μm and is anticoagulated by using citric acid as an anticoagulant, at a rate of 1/7 to the collected blood. Anticoagulation is not required when blood is collected from cavities where prior fibrinolysis has taken place, as in cases of postoperative autotransfusion. After collection the blood is reinfused by using gravity, being filtered again through 40 μm pore filters. Indications for Intraoperative Blood Salvage
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