Zachary Osborne1, Kristine Hanson1, Benjamin S Brooke2, Marc Schermerhorn3, Peter Henke4, Rumi Faizer5, Andres Schanzer6, Philip Goodney7, Thomas Bower1, Randall R DeMartino8. 1. Division of Vascular and Endovascular Surgery, Mayo Clinic, Rochester, MN. 2. Section of Vascular Surgery, The University of Utah School of Medicine, Salt Lake City, UT. 3. Division of Vascular and Endovascular Surgery, Beth Israel Deaconess Medical Center, Boston, MA. 4. Section of Vascular Surgery, University of Michigan, Ann Arbor, MI. 5. Division of Vascular Surgery, University of Minnesota, Minneapolis, MN. 6. Division of Vascular Surgery, University of Massachusetts Medical Center, Worcester, MA. 7. Section of Vascular Surgery, Dartmouth-Hitchcock Medical Center, Hanover, NH. 8. Division of Vascular and Endovascular Surgery, Mayo Clinic, Rochester, MN. Electronic address: demartino.randall@mayo.edu.
Abstract
BACKGROUND: Blood transfusions are associated with adverse events. We examined perioperative transfusion practices and associated complications following open vascular procedures nationwide in the Vascular Quality Initiative (VQI). METHODS: Adults undergoing open abdominal aortic aneurysm repair (OAR) and lower extremity arterial bypass (Bypass) within VQI (2003-2016) were identified. All emergent cases, patients with preoperative hemoglobin <7 g/dL, preoperative hospitalization >1 day, or a return to operating room during the index hospitalization were excluded. Units of red blood cells transfused were the primary outcome. Secondary outcomes were postoperative myocardial infarction (MI) and death. Patient, center, and procedural factors were evaluated. Multivariable mixed effects negative binomial regression and multivariable logistic regression were performed. RESULTS: We identified 24,131 procedures (OAR 3885, 16.1%; Bypass 20,246, 83.9%) among 22,532 patients (10.1% had >1 procedure). Overall, 37.5% of OAR and 19.5% of Bypass were transfused. Transfusion rates varied across estimated blood loss quartiles and across various preoperative hemoglobin levels. The overall rate of postoperative MI and death was 4.0% and 1.8% for OAR, and 2.2% and 0.7% for Bypass, respectively. In univariate and multivariable analysis, transfusions were associated with an increased risk of postoperative MI and death. A mixed effects negative binomial model demonstrated variation in transfusions across centers (P < 0.001). Female gender and preoperative anemia were significantly associated with transfusions. CONCLUSIONS: Blood transfusions are variable across centers in VQI. Transfusions are associated with a higher postoperative MI and death after OAR and Bypass. Efforts to reduce transfusion may focus on center variability, gender, and preoperative anemia.
BACKGROUND:Blood transfusions are associated with adverse events. We examined perioperative transfusion practices and associated complications following open vascular procedures nationwide in the Vascular Quality Initiative (VQI). METHODS: Adults undergoing open abdominal aortic aneurysm repair (OAR) and lower extremity arterial bypass (Bypass) within VQI (2003-2016) were identified. All emergent cases, patients with preoperative hemoglobin <7 g/dL, preoperative hospitalization >1 day, or a return to operating room during the index hospitalization were excluded. Units of red blood cells transfused were the primary outcome. Secondary outcomes were postoperative myocardial infarction (MI) and death. Patient, center, and procedural factors were evaluated. Multivariable mixed effects negative binomial regression and multivariable logistic regression were performed. RESULTS: We identified 24,131 procedures (OAR 3885, 16.1%; Bypass 20,246, 83.9%) among 22,532 patients (10.1% had >1 procedure). Overall, 37.5% of OAR and 19.5% of Bypass were transfused. Transfusion rates varied across estimated blood loss quartiles and across various preoperative hemoglobin levels. The overall rate of postoperative MI and death was 4.0% and 1.8% for OAR, and 2.2% and 0.7% for Bypass, respectively. In univariate and multivariable analysis, transfusions were associated with an increased risk of postoperative MI and death. A mixed effects negative binomial model demonstrated variation in transfusions across centers (P < 0.001). Female gender and preoperative anemia were significantly associated with transfusions. CONCLUSIONS:Blood transfusions are variable across centers in VQI. Transfusions are associated with a higher postoperative MI and death after OAR and Bypass. Efforts to reduce transfusion may focus on center variability, gender, and preoperative anemia.
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