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Table 5 Transfusion data (“per protocol” analysis, protocol violations excluded)

From: Monitoring of brain oxygen saturation (INVOS) in a protocol to direct blood transfusions during cardiac surgery: a prospective randomized clinical trial

  Group A (n = 70) Group B (n = 67) P
In OR    
RBC units transfused 14 35  
Patients transfused 11 (15.7%) 20 (29.8%) 0.048
RBC per transfused pt 1.27 ± 0.47 1.75 ± 0.55 0.021
RBC/pt overall 0.20 ± 0.50 0.52 ± 0.88 0.008
In the ICU and ward    
RBC units transfused 78 87  
Patients transfused 42 (60.0%) 49 (74.2%) 0.103
RBC per transfused pt 1.86 ± 0.72 1.78 ± 1.04 0.670
RBC/pt overall 1.11 ± 1.07 1.30 ± 1.25 0.344
Overall    
RBC units transfused 92 122  
Patients transfused 46 (65.7%) 55 (82.1%) 0.029
RBC per transfused pt 2.00 ± 0.89 2.22 ± 1.21 0.314
RBC/pt overall 1.31 ± 1.20 1.82 ± 1.46 0.024