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  • Title: Patient-based and surgical characteristics associated with the acute development of deep venous thrombosis and pulmonary embolism after spine surgery.
    Author: Schoenfeld AJ, Herzog JP, Dunn JC, Bader JO, Belmont PJ.
    Journal: Spine (Phila Pa 1976); 2013 Oct 01; 38(21):1892-8. PubMed ID: 23778367.
    Abstract:
    STUDY DESIGN: Retrospective analysis of a prospectively collected data set. OBJECTIVE: Identify the incidence of, and risk factors for, deep venous thrombosis (DVT) and pulmonary embolism (PE) after spine surgery. SUMMARY OF BACKGROUND DATA: Determination of ideal candidates for chemoprophylaxis after spine surgery is limited by the state of the literature, including incomplete understanding regarding the incidence of DVT and PE, as well as an inability to quantify specific risk factors among patients. METHODS: The 2005 to 2011 data set of the National Surgical Quality Improvement Program was queried to identify all individuals having undergone spine surgery. Demographic data, medical comorbidities, surgical characteristics, and the presence of DVT, PE, and/or mortality were abstracted for all individuals meeting inclusion criteria. Unadjusted univariate analysis was performed to identify variables that were potentially associated with the development of DVT or PE after surgery. A multivariate logistic regression test, controlling for other factors present in the model, was subsequently performed. Predictor variables that maintained significance after multivariate testing were considered influential in the development of DVT and/or PE. RESULTS: There were 27,730 patients who received spine procedures in this cohort. The average age was 56.4 (± 15.1) years. Lumbar spine procedures made up 61% of interventions. Death occurred in 87 instances (0.3%). The venous thromboembolic rate was 1%, with 206 individuals (0.7%) sustaining DVT and 113 (0.4%) developing a PE. Body mass index 40 and greater, age 80 years and older, operative time exceeding 261 minutes, and American Society of Anesthesiologists classification 3 or higher were identified as significant independent predictors of DVT, whereas body mass index 40 and greater, operative time exceeding 261 minutes, and male sex were associated with the development of PE. CONCLUSION: Multiple independent risk factors for the development of DVT and/or PE after spine surgery were identified. Patients with these characteristics may require additional counseling, procedural modification, or prophylaxis against venous thromboembolic events.
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