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.

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Built by Clay Good. Source on GitHub.