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Table 2 Transfusion Related Risk Factors

From: Outcomes in cardiac surgery in 500 consecutive Jehovah's Witness patients: 21 year Experience

Variable Group A n = 250 Group B n = 250 P
  1991-1998 1998 - 2012  
Blood Volume (ml) 5 200 +/- 480 5000 +/- 610 >0.05
Preoperative HCT (%) 41+/-2 40+/-4 <0.001
Preoperative erythrocyte mass (ml) 2215+/- 250 2010+/-200 < 0.05
Platelets 220 ± 60 180 ± 50 < 0 .05
Body Mass Index 25 ± 5 24 ± 3 >0.05
Age 51+/-7 68+/-5 <0.001
Female gender 11 28 <0.001
Diabetes 24 31 >0.05
Renal Failure 10% 10% >0.05
Euroscore 4.1 +/- 0.8 4.8 +/- 1.3 <0.05
Ejection Fraction 0.45+/-0.2 0.40+/-0.1 <0.001
Aortic Clamp Time 70+/-15 65+/-30 < 0.05
Ischemic Time 55+/-10 48+/-15 >0.05
Blood Loss (ml) 515 ± 310 350 ± 140 <0.001