A 35-year-old woman on warfarin for atrial fibrillation presents with recurrent bilateral epistaxis over 3 weeks. INR is 4.2 (therapeutic range 2–3). Anterior rhinoscopy reveals no visible bleeding point, but blood is oozing diffusely from both nasal cavities. Coagulation studies show PT 45 seconds, platelet count 250,000/μL, aPTT 38 seconds. What is the most appropriate immediate management?

Explanation

## Clinical Diagnosis **Key Point:** Drug-induced epistaxis (warfarin over-anticoagulation) with diffuse oozing from both nasal cavities and **supratherapeutic INR (4.2 vs. target 2–3)** requires **reversal of anticoagulation** as the primary intervention, NOT local hemostasis alone. ## Pathophysiology Warfarin inhibits vitamin K-dependent factors (II, VII, IX, X). An INR >4 significantly increases bleeding risk, particularly in mucous membranes (nose, GI tract). Diffuse bilateral oozing indicates systemic coagulopathy, not a localized vessel rupture. ## Management Algorithm ```mermaid flowchart TD A[Epistaxis on Warfarin]:::outcome --> B{INR level?}:::decision B -->|INR 2-3 therapeutic| C[Topical hemostasis + cauterization]:::action B -->|INR 3-4| D[Reduce warfarin dose]:::action B -->|INR > 4| E[Reverse anticoagulation]:::urgent E --> F[Vitamin K 5-10 mg IV/PO]:::action E --> G[Fresh Frozen Plasma or PCC]:::action F --> H[Topical hemostatic agents]:::action G --> H H --> I[Monitor INR, recheck in 24 hrs]:::action I --> J{Bleeding controlled?}:::decision J -->|Yes| K[Resume warfarin at lower dose]:::action J -->|No| L[Cauterization or packing]:::action ``` ## Anticoagulation Reversal Strategy **High-Yield:** For **INR >4 with bleeding**: 1. **Vitamin K (phytonadione):** 5–10 mg IV or PO - Onset: 12–24 hours (slow) - Must be combined with faster agents for immediate reversal 2. **Fresh Frozen Plasma (FFP):** 10–15 mL/kg (contains factors II, VII, IX, X) - Onset: immediate - Preferred over FFP: **Prothrombin Complex Concentrate (PCC)** 25–50 units/kg (more concentrated, less volume) 3. **Recheck INR in 24 hours** after reversal ## Role of Topical Hemostasis **Clinical Pearl:** In drug-induced epistaxis, topical hemostatic agents (thrombin, gelfoam, tranexamic acid-soaked gauze) are **adjunctive** and work best when the underlying coagulopathy is corrected. Packing or cauterization without anticoagulation reversal will fail. ## Why Not Cauterization Alone? Cauterization addresses a localized bleeding vessel. In diffuse bilateral oozing from supratherapeutic anticoagulation, there is no single "bleeding point" — the entire nasal mucosa is at risk. Reversal of INR is the definitive treatment. ## Monitoring and Follow-up - Recheck INR 24 hours after reversal - Resume warfarin at a **lower maintenance dose** once INR is therapeutic - Investigate cause of over-anticoagulation (drug interaction, dietary change, compliance issue) - Consider alternative anticoagulation (DOAC) if recurrent epistaxis on warfarin