Administration of Venous Thromboembolism Chemoprophylaxis Within 12 Hours of Pelvic and Acetabular Surgery Has No Effect on Estimated Blood Loss, Perioperative Change in Hemoglobin, or Need for Transfusion.

Objective: To determine if preoperative administration of venous thromboembolism (VTE) chemoprophylaxis (PPx) before pelvic and acetabular fracture surgery affects estimated blood loss (EBL), perioperative change in hemoglobin (ΔHgb), or transfusion rates.

Design: Retrospective cohort study.

Setting: Level 1 trauma center, southeastern United States.

Patients/participants: All pelvic and acetabular surgeries performed between April 2014 and February 2020.

Main Outcome Measurements: EBL, immediate and 24-hour postoperative ΔHgb, and intraoperative/postoperative transfusion.

Results: In all, 267 surgeries were included: 97 prechange and 170 postchange. Median injury severity score was 17 before versus 14 after the change. One surgeon retired and two started during the study, producing differences in acetabular approaches. Median surgical duration was longer postchange. Cohorts were otherwise similar. No differences were observed in EBL, ΔHgb, or transfusion rates. Rates of VTE and surgical site complications were unchanged. No VTE-related deaths occurred. In the as-treated analysis (63 patients given low-molecular-weight heparin <12 hours preoperatively vs. 190 patients not given PPx), no differences were observed.

Conclusions: Administration of VTE PPx within 12 hours of pelvic and acetabular surgery had no effect on perioperative blood loss. This study is limited by changes in faculty, but it suggests that traumatologists need not advocate for holding VTE PPx before pelvic and acetabular trauma surgery.

Level Of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.