Predictable Risk Factors of Spontaneous Venous Thromboembolism in Patients Undergoing Spine Surgery

OBJECTIVE: The purpose of this study was to conduct a meta-analysis to identify the risk factors for formation of venous thromboembolism (VTE) in patients after spine surgery. METHODS: This study retrieved potential academic articles on the related factors for VTE formation in patients after spine surgery from MEDLINE, PubMed, EMBASE, and the Cochrane Library. The reference articles for the identified studies were carefully reviewed to ensure that all available documents were represented in the study. RESULTS: A total of 21 articles (20 retrospective studies and 1 prospective study) involving 2,870,105 patients were identified in the analysis, including 7829 patients who presented with VIE after spine surgery; the incidence of VTE was 0.273%. Our meta-analysis showed that compared with patients who did not have VTE after spine surgery, there was significantly more blood loss (weighted mean difference [WMD], 93.295; 95% confidence interval [CI], 60.521-126.069; P< 0.001), higher age (WMD, 6.011; 95% CI, 3.647-9.376; P < 0.001), thoracolumbar surgery (odds ratio [013], 0233; 95% CI, 0.198-0.274; P < 0.001), and longer duration of surgery (WMD, 45.672; 95% CI, 10.433 to -80.911; P = 0.011) among the patients with VTE. Patients with a history of hypertension (OR, 1.785; 95% CI, 1.516-2.103; P < 0.001), diabetes (OR, 1.535; 95% CI, 1.286-1.832; P < 0.001), and preoperative walking disability (OR, 4.882; 95% CI, 2.044-11.663; P < 0.001) showed a significantly higher rate of VTE after spine surgery. However, no significant differences were found in gender (P = 0.289), fusion surgery (P = 0.979), body mass index (P = 0.157), history of heart disease (P = 0.397), and level of D-dimer (P = 0.220). CONCLUSIONS: A higher rate of postoperative VTE is closely associated with the elderly, longer duration of surgery, thoracolumbar surgery, greater blood loss, and patients with a history of hypertension, preoperative walking disability, or diabetes after spinal surgery; these risk factors should be guarded against.