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Objective  This study aims to observe the impact of the temperature of blood transfusion and infusion toward the perioperative cerebral oxygen metabolism and the postoperative cognitive recovery.    Methods  Eighty patients of knee replacement under epidural and general anesthesia were randomly divided into warming blood transfusion and infusion (WBI) group ( n  = 40) and control group ( n  = 40). The changes of nasopharyngeal temperature, middle cerebral artery blood flow, CERO 2 , and SjVO 2  of the two groups were recorded at each time point for the assessment of the postoperative overall quality of recovery and cognitive recovery situation.    Results  The nasopharyngeal temperatures of the two groups at different time points after transfusion were significantly lower than that at T1, and there was a significant difference between the two groups ( P  < 0.05). The CERO 2  values of the two groups at T3 were significantly higher than at T1, while the SjVO 2  values were significantly decreased ( P  < 0.01).    Conclusion  The WBI can significantly reduce the occurrence of the perioperative hypothermia, while it has no significant effect toward cerebral oxygen metabolism, postoperative overall recovery, and recovery of cognitive function.

journal of orthopaedic surgery and research

Impact of warming blood transfusion and infusion toward cerebral oxygen metabolism and cognitive recovery in the perioperative period of elderly knee replacement