Association Between Preoperative Blood Transfusion and Postoperative Venous Thromboembolism: Review Meta-Analysis.

BACKGROUND: Several studies have shown that preoperative blood transfusion is associated with postoperative venous thromboembolism (VTE). In this study, a meta-analysis was performed to explore the relationship between preoperative blood transfusion and postoperative VTE. METHODS: Published articles were identified through a comprehensive review of PubMed and EMBASE. Data from studies reporting relative risks, odds ratios, or hazard ratios comparing the risk of postoperative VTE among participants who had preoperative blood transfusion versus those without preoperative blood transfusion were analyzed. A random-effect model was used to calculate pooled odds ratios and 95% confident intervals (CIs). RESULTS: Eight studies, which included 3,504,778 participants, aligned with our inclusion criteria and were included in the meta-analysis. Pooled analysis showed an association between preoperative blood transfusion and postoperative VTE, with an odds ratio of 2.95 (95% CI: 1.65-5.30; I2 = 89.1%). In subgroup analyses, the positive association between preoperative blood transfusion and postoperative VTE was still exist in studies with confounders adjustment. Sensitivity analysis by one-study-removed analysis confirmed the robustness of our results. CONCLUSIONS: Our study indicated that preoperative blood transfusion was associated with higher odds of postoperative VTE. Further large-scale prospective cohort studies are needed to investigate the causality between preoperative blood transfusion and postoperative VTE.