that their use is associated with added morbidity and mortality and that a lower transfusion
threshold is safe. It is unclear if this new evidence has translated into decreased RBC use
among surgical patients. The purpose of this study is to measure the change in use of RBCs
during the last decade. STUDY DESIGN: We performed a cross-sectional cohort study of all
patients who underwent inpatient operations in the 52 hospitals in Maryland in 1997 to 1998 …