A 68-year-old man with a history of atrial fibrillation is brought to the emergency department after vomiting large amounts of bright red blood. He takes warfarin daily. On presentation, he appears pale and lethargic. His temperature is 37.1°C (98.8°F), blood pressure is 88/56 mm Hg, and heart rate is 118/min. Physical examination reveals delayed capillary refill and cool extremities. Laboratory studies show a hemoglobin of 8.2 g/dL and an International Normalized Ratio (INR) of 8.4. Intravenous fluid resuscitation with normal saline is initiated. Which of the following is the most appropriate next step in management?
- AAdminister intravenous vitamin K only
- BAdminister protamine sulfate
- Administer prothrombin complex concentrate and intravenous vitamin KCevap
- DAdminister fresh frozen plasma without vitamin K
- EAdminister broad-spectrum intravenous antibiotics
Cevap
The most appropriate next step is to administer prothrombin complex concentrate and intravenous vitamin K.
Warfarin inhibits the enzyme vitamin K epoxide reductase, which prevents the activation of vitamin K-dependent clotting factors (II, VII, IX, and X). In the setting of severe, life-threatening bleeding with an elevated INR, immediate and sustained reversal of anticoagulation is mandatory. Prothrombin complex concentrate (PCC) contains concentrated factors II, VII, IX, and X, providing rapid correction of the coagulopathy with minimal volume load (unlike fresh frozen plasma). Intravenous vitamin K must be administered concurrently to provide the substrate needed for the liver to synthesize new endogenous clotting factors, which prevents rebound coagulopathy once the administered PCC degrades.
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Anahtar Kavram
Severe, life-threatening bleeding associated with warfarin toxicity requires immediate reversal with prothrombin complex concentrate (PCC) and intravenous vitamin K.