Free hemoglobin concentrations in patients receiving massive blood transfusion during emergency surgery for trauma

Purpose: To determine free hemoglobin concentration in patients who receive d massive blood transfusion during emergency surgery for trauma with consid eration of the storage of the transfused blood. Methods: Fifteen patients undergoing emergency surgery for multiple trauma and who received blood transfusion of more than 5,000 mt were studied. Tran sfusion of the stored whole blood in citrate-phosphate glucose solution usi ng a micropore filter was started before surgery. Serum concentrations of h emoglobin (total:THb and free:fHb) and total haptoglobin (THp) were measure d until 5,000 mt of blood had been transfused. Serum free haptoglobin (fHp) concentration was calculated. The correlation between the changes in hemog lobin or haptoglobin concentrations and total storage days of the transfuse d blood was analyzed by a simple regression analysis. Results: Free hemoglobin was detected after 2,000 mt transfusion. The THp a nd fHp decreased after 1,000 mt transfusion. Total storage time (days) of t ransfused blood had correlated with the changes of THp (P < 0.0001) and fHp (P = 0.0027) but not with the changes of THb (P = 0.984) and fHb (P = 0.83 4). Conclusion: After blood transfusion during surgery for trauma, serum haptog lobin concentration decreased with transfusion of greater than or equal to 1,000 mt of whole blood with mean storage time of 12.2 dy. Free hemoglobin was detected after 2,000 mt transfusion when THp decreased to 1,000 mg L-l. Serum haptoglobin concentrations correlated negatively with storage time ( days) of transfused blood.