Thromboprophylaxis in Obese Patients

Introduction to Thromboprophylaxis

Thromboprophylaxis is crucial in obese patients to prevent deep vein thrombosis (DVT) and pulmonary embolism, with guidelines supported by the European Society of Cardiology 1

For obese patients with BMI ≥40 kg/m² or body weight >120 kg, the European Society of Cardiology recommends enoxaparin thromboprophylaxis at 40 mg twice daily rather than the standard 40 mg once daily dosing used in non-obese patients 1
Body weight-based or higher than usual fixed doses of Low Molecular Weight Heparin (LMWH) are recommended for surgical and medical prophylaxis in obesity class ≥2 or if body weight exceeds 120 kg, as suggested by the European Society of Cardiology working groups on cardiovascular pharmacotherapy and thrombosis 1
The recommended dosing regimen for DVT prophylaxis in patients with BMI 40 undergoing gastric bypass surgery is enoxaparin 40 mg twice daily, optimizing mortality and morbidity outcomes 1

For bariatric surgery patients, the recommended approach includes preoperative dosing of 40 mg enoxaparin subcutaneously 12 hours before surgery, postoperative dosing of 40 mg enoxaparin subcutaneously every 12 hours, and continuation until full mobilization, typically 10-14 days post-discharge 1
Standard prophylactic dosing of 40 mg once daily is inadequate for patients with BMI ≥40, with lower dosing regimens (30 mg twice daily or 40 mg once daily) associated with higher DVT rates compared to 40 mg twice daily 1
The European Society of Cardiology working group on cardiovascular pharmacotherapy and thrombosis found that 40 mg twice daily was effective for bariatric surgical patients, as demonstrated by the EFFORT trial 1

Administer the last preoperative dose 12 hours before surgery, and resume postoperative doses 12-24 hours after surgery when adequate hemostasis is achieved 2
For patients with impaired renal function (CrCl <30 mL/min), dose adjustment may be necessary 2
If neuraxial anesthesia is planned, enoxaparin should be held for 24 hours before epidural placement or removal to prevent spinal hematoma 2

Extended prophylaxis should continue for 10-14 days post-discharge due to prolonged thrombotic risk in bariatric patients 2