While major guidelines are often ambiguous on the optimal weight descriptor for heparin dosing in obesity, clinical data supports the use of adjusted body weight. Some studies demonstrate that using adjusted body weight leads to a faster time to achieving therapeutic anticoagulation levels and reduces the rate of supratherapeutic levels compared to using total body weight. Furthermore, this approach has been associated with a reduced risk of clinically significant bleeding in obese patients. ...
A 2016 expert clinical guidance on the practical management of heparin anticoagulants for venous thromboembolism (VTE) provides recommendations on dosing, monitoring, dose adjustment, and management in special populations, including those with extreme body weights. For obese and morbidly obese patients, the guidance recommends calculating heparin doses using either total or adjusted body weight, with close monitoring of early laboratory values to ensure timely achievement of therapeutic anticoagulation. The guidance also cautions that empiric dose caps may lead to under-anticoagulation and advises individualized dosing when caps are applied. Heparin infusion rates achieving therapeutic anticoagulation in this population have been reported to range from approximately 5 to 12.8 units/kg/hour. Notably, the guidance did not define a maximum heparin infusion rate in obese patients, emphasizing instead the importance of ensuring the therapeutic threshold is reached promptly. Due to limite...
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A search of the published medical literature revealed
13 studies investigating the researchable question:
What does the literature say regarding heparin infusion dosing in obese patients related to time to therapeutic aPTT, BMI threshold for using adjusted body weight, and safety?
Level of evidence
C - Multiple studies with limitations or conflicting results
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[1] Smythe MA, Priziola J, Dobesh PP, Wirth D, Cuker A, Wittkowsky AK. Guidance for the practical management of the heparin anticoagulants in the treatment of venous thromboembolism. J Thromb Thrombolysis. 2016;41(1):165-186. doi:10.1007/s11239-015-1315-2
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[7] Smythe MA, Priziola J, Dobesh PP, Wirth D, Cuker A, Wittkowsky AK. Guidance for the practical management of the heparin anticoagulants in the treatment of venous thromboembolism. J Thromb Thrombolysis. 2016;41(1):165-186. doi:10.1007/s11239-015-1315-2
[8] Vandiver JW, Ritz LI, Lalama JT. Chemical prophylaxis to prevent venous thromboembolism in morbid obesity: literature review and dosing recommendations. J Thromb Thrombolysis. 2016;41(3):475-481. doi:10.1007/s11239-015-1231-5
[9] Sebaaly J, Covert K. Enoxaparin Dosing at Extremes of Weight: Literature Review and Dosing Recommendations. Ann Pharmacother. 2018;52(9):898-909. doi:10.1177/1060028018768449