Periprocedural Anticoagulant Bridging
Answers the two periprocedural anticoagulation questions: whether to interrupt, and whether to bridge.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- What the patient takes
- Warfarin
- Bleeding risk of the procedure
- High bleeding risk
- Thrombotic risk of the patient
- Low or moderate thrombotic risk
Result: interrupt warfarin and do not bridge
The tool opens with these values already filled in. Replace them with your own.
What the result means
- A direct oral anticoagulant
- Interrupted on the bleeding risk of the procedure and on renal function, and never bridged. The short half-life is the bridge, and no INR times it.
- Warfarin, low or moderate risk
- Interrupted, and not bridged. The BRIDGE trial showed bridging increases major bleeding without reducing thromboembolism in most patients.
- Warfarin, high thrombotic risk
- The small group in which bridging is considered: a mechanical mitral valve, a stroke or venous thromboembolism within 3 months, or an equivalent. Still a judgment.
- Minimal bleeding risk
- Interruption may not be needed at all. Many dental, dermatologic, ophthalmic and endoscopic procedures are done on anticoagulation.
- The default
- Not to bridge. Bridging was routine for years and the evidence reversed it, so the question is whether this patient is one of the few exceptions.
- Resumption
- Its own decision, timed on hemostasis rather than the calendar. A therapeutic-dose resumption after a high-bleeding-risk procedure is usually delayed further.
What you enter
- What the patient takes
- Bleeding risk of the procedure
- Thrombotic risk of the patient (only the warfarin branch turns on this)
How this is calculated
Douketis JD, Spyropoulos AC, Murad MH, et al. Perioperative Management of Antithrombotic Therapy: an American College of Chest Physicians Clinical Practice Guideline. Chest. 2022;162(5):e207-e243. BRIDGE trial: N Engl J Med. 2015;373(9):823-833. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.