Post-Procedure Bridging with LMWH for Warfarin Patients

Timing of Post-Procedure LMWH Resumption

For patients on warfarin requiring post-procedure bridging, resume therapeutic-dose LMWH at least 24 hours after low-to-moderate bleeding risk procedures and 48-72 hours after high bleeding risk procedures, continuing until INR reaches therapeutic range (≥2.0) 1
Resume full therapeutic-dose LMWH within 24 hours post-procedure once adequate hemostasis is confirmed for low-to-moderate bleeding risk procedures 2, 1
Restart warfarin on the evening of the procedure or the morning after for low-to-moderate bleeding risk procedures 2, 4
Wait 48-72 hours before resuming therapeutic-dose LMWH for high bleeding risk procedures 2, 4, 1
For patients at high VTE risk during the 48-72 hour window after high bleeding risk procedures, consider prophylactic-dose LMWH (enoxaparin 40 mg daily or dalteparin 5,000 IU daily) for the initial 2-3 days before transitioning to therapeutic dosing 1

Use enoxaparin 1 mg/kg twice daily OR 1.5 mg/kg once daily subcutaneously for therapeutic dosing 2
Use dalteparin 100 IU/kg twice daily OR 200 IU/kg once daily subcutaneously for therapeutic dosing 2
Use tinzaparin 175 IU/kg once daily subcutaneously for therapeutic dosing 2

Major bleeding occurs in up to 20% of patients when therapeutic-dose LMWH is given too close to surgery without regard for bleeding risk 2

Intermediate-dose LMWH regimens (enoxaparin 40 mg twice daily or nadroparin 2850-5700 U twice daily) have shown favorable safety and efficacy profiles for patients where you're concerned about both bleeding and thrombosis 2

The 2022 American College of Chest Physicians guidelines acknowledge these recommendations are based on very low certainty of evidence 1