Carson, J., Terrin, M., Noveck, H., et al. (2011). Liberal or Restrictive Transfusion in High-Risk Patients after Hip Surgery. The New England Journal of Medicine. 365: 2453-2462.
Using a randomized trial, the authors examined whether a higher threshold for blood transfusion would improve patient recovery from hip fracture surgery. They found no reduction in death or inability to walk independently at 60-day follow up in liberal vs. restrictive transfusion strategy recipients.