A 62-year-old man with chronic liver disease (Child-Pugh B) and steatorrhea presents with easy bruising, epistaxis, and an INR of 3.2 (normal <1.2). Prothrombin time is prolonged. Serum albumin is 2.8 g/dL. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has **chronic liver disease with coagulopathy** (elevated INR, easy bruising, epistaxis). The combination of steatorrhea (fat malabsorption) and liver disease suggests **vitamin K deficiency** as a reversible contributor to the prolonged PT/INR. ## Pathophysiology of Vitamin K Deficiency in Liver Disease ```mermaid flowchart TD A[Chronic liver disease + steatorrhea]:::outcome --> B[Impaired fat absorption]:::outcome B --> C[Vitamin K deficiency]:::outcome C --> D[Reduced synthesis of<br/>factors II, VII, IX, X]:::outcome D --> E[Prolonged PT/INR]:::outcome E --> F{Vitamin K responsive?}:::decision F -->|Yes: deficiency component| G[Administer vitamin K IV]:::action F -->|No: liver synthetic failure| H[FFP/PCC for acute bleeding]:::action ``` ## Key Point: **Vitamin K deficiency is a REVERSIBLE cause of coagulopathy in liver disease.** - Vitamin K is **fat-soluble**; malabsorption (steatorrhea) impairs its uptake. - Vitamin K is a cofactor for **γ-carboxylation** of clotting factors II, VII, IX, X (PIVKA-II rises in deficiency). - **Standard dose:** 10 mg IV daily for 3 days. - **Expected response:** INR normalizes within 24–48 hours if deficiency is the primary cause. - If INR does NOT improve after vitamin K, coagulopathy is due to **hepatic synthetic failure** (not vitamin K-responsive). ## High-Yield: **Vitamin K-responsive vs. non-responsive coagulopathy:** | Feature | K-Responsive | K-Non-Responsive | |---------|--------------|------------------| | Cause | Malabsorption, antibiotics | Liver synthetic failure | | Response to IV vitamin K | INR normalizes in 24–48 h | No improvement | | Factors affected | II, VII, IX, X | II, V, VII, IX, X, fibrinogen | | Factor V level | Normal | Low | | Management | Vitamin K 10 mg IV | FFP, PCC, supportive care | ## Clinical Pearl: **Factor VII has the shortest half-life (~6 hours) among vitamin K-dependent factors.** If INR improves rapidly after vitamin K, it indicates vitamin K deficiency. Persistent elevation despite vitamin K suggests hepatic synthetic failure (low factor V, fibrinogen). ## Tip: **Do NOT give FFP empirically before trying vitamin K.** FFP carries volume overload risk in cirrhotic patients and may precipitate variceal bleeding. Reserve FFP for active bleeding or when vitamin K has failed to correct INR. [cite:Harrison 21e Ch 297; KD Tripathi 8e Ch 12]