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Table 8 Factors affecting blood transfusion/blood loss in THA

From: Efficacy and cost-effectiveness of universal pre-operative iron studies in total hip and knee arthroplasty

Total hip arthroplasty data OR/estimate (95% CI) Comparison P value Global P value
Multivariable analysis for outcome: blood transfusiona
 Late pre-operative haemoglobin 0.89 (0.83,0.95)   0.0006
Multivariable analysis for outcome: RBC collected
 Iron transfusion, yes vs no 60.2 (22.3, 98.1)   0.0019
 Type of anaesthesia    
  Spinal vs GA −38.7 (−68.9, −8.4)   0.0375
 Late pre-operative haemoglobin 1.46 (0.43, 2.50)   0.0056
Multivariable analysis for outcome: blood loss
 Iron transfusion, yes vs no 85.3 (11.7, 158.8)   0.0231
 Anticoagulants    0.0496
  0 vs 3b -162.6 (−294.1, −31.1) 0.0153  
  2 vs 3b −182.4 (−363.1, −1.7) 0.0478  
Multivariable analysis for outcome: Hb drop
 Late pre-operative haemoglobin 0.02 (0.01,0.03)   <0.0001
  1. aBinary logistic model – odds ratio (95% CI) – modelling the probability that blood transfusion = yes
  2. bAnti coag (0 = Clexane, 1 = aspirin, 2 = warfarin, 3 = all others [rivaroxaban, apixaban])