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• W2796165711 abstract "BackgroundMany patients undergoing thoracic surgical procedures have venous thromboembolism (VTE) events despite the receipt of chemical prophylaxis. Enoxaparin’s pharmacologic impact can be quantified by using anti-Factor Xa (aFXa) levels. We hypothesized that enoxaparin 40 mg once daily would be inadequate for most inpatients undergoing thoracic surgical procedures and that a real-time dose adjustment algorithm would be effective.MethodsThis prospective clinical trial enrolled inpatients who were to undergo a thoracic surgical procedure and placed on enoxaparin 40 mg once daily for VTE prophylaxis after surgical procedures. aFXa levels were used to measure the anticoagulant effect of enoxaparin once steady state had been reached. Patients whose aFXa levels were out of range received real-time enoxaparin dose adjustment and had repeat aFXa levels drawn.ResultsNinety-three inpatients undergoing thoracic surgical procedures were prospectively enrolled. The majority of patients (67.4%) had low peak aFXa levels (<0.3 IU/mL), indicative of inadequate enoxaparin prophylaxis, and 30.3% of patients had in-range aFXa levels (0.3 to 0.5 IU/mL). Patient weight had a moderate correlation (r2 0.38) with peak aFXa level. Patient weight, female sex, and preoperative creatinine were independent predictors of peak aFXa in a linear regression model. Real-time, protocol-driven enoxaparin dose adjustment allowed a significantly increased proportion of patients to achieve in-range aFXa levels (30.3% vs 97.6%, p < 0.001).ConclusionsEnoxaparin 40 mg once daily is inadequate for most inpatients undergoing thoracic surgical procedures, based on a pharmacodynamic study of aFXa levels. Future research should examine the impact of weight-based once daily enoxaparin dosing versus twice daily enoxaparin dosing on prophylaxis adequacy. Many patients undergoing thoracic surgical procedures have venous thromboembolism (VTE) events despite the receipt of chemical prophylaxis. Enoxaparin’s pharmacologic impact can be quantified by using anti-Factor Xa (aFXa) levels. We hypothesized that enoxaparin 40 mg once daily would be inadequate for most inpatients undergoing thoracic surgical procedures and that a real-time dose adjustment algorithm would be effective. This prospective clinical trial enrolled inpatients who were to undergo a thoracic surgical procedure and placed on enoxaparin 40 mg once daily for VTE prophylaxis after surgical procedures. aFXa levels were used to measure the anticoagulant effect of enoxaparin once steady state had been reached. Patients whose aFXa levels were out of range received real-time enoxaparin dose adjustment and had repeat aFXa levels drawn. Ninety-three inpatients undergoing thoracic surgical procedures were prospectively enrolled. The majority of patients (67.4%) had low peak aFXa levels (<0.3 IU/mL), indicative of inadequate enoxaparin prophylaxis, and 30.3% of patients had in-range aFXa levels (0.3 to 0.5 IU/mL). Patient weight had a moderate correlation (r2 0.38) with peak aFXa level. Patient weight, female sex, and preoperative creatinine were independent predictors of peak aFXa in a linear regression model. Real-time, protocol-driven enoxaparin dose adjustment allowed a significantly increased proportion of patients to achieve in-range aFXa levels (30.3% vs 97.6%, p < 0.001). Enoxaparin 40 mg once daily is inadequate for most inpatients undergoing thoracic surgical procedures, based on a pharmacodynamic study of aFXa levels. Future research should examine the impact of weight-based once daily enoxaparin dosing versus twice daily enoxaparin dosing on prophylaxis adequacy." @default.
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• W2796165711 date "2018-08-01" @default.
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• W2796165711 title "Enoxaparin 40 mg per Day Is Inadequate for Venous Thromboembolism Prophylaxis After Thoracic Surgical Procedure" @default.
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• W2796165711 doi "https://doi.org/10.1016/j.athoracsur.2018.02.085" @default.
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