🩸 Emergency surgery in APS patient on warfarin
SLE + thrombotic antiphospholipid syndrome (APS) + pulmonary embolism 4 months ago = high perioperative thrombosis risk, but emergency laparotomy requires reliable hemostasis.
🚨 Before OR
🔹 Stop warfarin immediately.
🔹 Confirm current INR, CBC, fibrinogen, renal/liver function and last warfarin dose.
🔹 For immediate surgery with INR 2:
💉 4-factor PCC 25 IU/kg IV
• Maximum 2,500 IU for INR 2–<4
• Dose according to local protocol/product
➕ Vitamin K 5–10 mg IV slowly for sustained reversal
🎯 Recheck INR approximately 30 minutes after PCC; commonly aim INR ≤1.5 before major abdominal surgery, according to surgical/anesthetic requirements.
⚠️ PCC acts rapidly but carries thrombotic risk—use only the required dose.
❌ Do not delay life-saving surgery waiting for vitamin K alone.
❌ Fresh frozen plasma is unnecessary when 4-factor PCC is available; consider it only if PCC is unavailable.
🛡️ Prevent postoperative thrombosis
🔹 Intermittent pneumatic compression immediately.
🔹 Start prophylactic UFH/LMWH once surgical hemostasis is secure—often within 12–24 hours.
🔹 Because thrombotic APS is high risk, escalate to therapeutic UFH/LMWH when bleeding risk permits—commonly 48–72 hours after major abdominal surgery, individualized with surgery/hematology.
🔹 UFH may be preferred if renal impairment, uncertain hemostasis or possible reoperation because it is short-acting and reversible.
🔹 Restart warfarin when enteral intake and hemostasis allow, overlapping with heparin until the INR is therapeutic.
🧠 APS pearl: Lupus anticoagulant may prolong aPTT; if UFH monitoring appears unreliable, use a validated anti-Xa assay.
✅ The principle: rapid, controlled warfarin reversal for surgery—then minimize time without anticoagulation.
❓ MCQ: Best immediate reversal for INR 2 before emergency laparotomy?
A. Vitamin K alone
B. FFP alone
C. 4-factor PCC + IV vitamin K ✅
D. Platelet transfusion
🎭 OSCE: State the competing risks, stop warfarin, administer PCC plus vitamin K, verify INR, ensure mechanical prophylaxis, and establish a documented postoperative heparin/warfarin restart plan.
References: 4-factor PCC prescribing information—DailyMed, 2025 warfarin-reversal recommendations, EULAR APS recommendations
#APS #Warfarin #Anticoagulation #EmergencySurgery #Hematology
