A 45-year-old woman with metastatic adenocarcinoma of the lung develops DIC with severe hypofibrinogenemia (fibrinogen 80 mg/dL) and active bleeding. After transfusion of fresh frozen plasma, her coagulopathy worsens. Which is the drug of choice to restore fibrinogen and improve hemostasis in this patient?

Explanation

## Fibrinogen Replacement in DIC **Key Point:** Cryoprecipitate is the drug of choice for fibrinogen replacement in DIC because it provides concentrated fibrinogen with minimal volume and is more effective than FFP for raising fibrinogen levels rapidly. ### Why Cryoprecipitate is Superior #### 1. **Fibrinogen Concentration** - **Cryoprecipitate:** 150–250 mg fibrinogen per unit (10 mL). - **FFP:** 1–2 g fibrinogen per unit (200–250 mL). - Cryoprecipitate delivers 10–15 times more fibrinogen per unit volume. #### 2. **Volume Efficiency** - Cryoprecipitate: 10 units (~100 mL) raises fibrinogen by ~100 mg/dL. - FFP: 10 units (~2 L) raises fibrinogen by only ~20 mg/dL. - In DIC with fluid overload risk, cryoprecipitate avoids pulmonary edema. #### 3. **Composition of Cryoprecipitate** | Component | Amount per Unit | Clinical Benefit | |-----------|-----------------|------------------| | **Fibrinogen** | 150–250 mg | Restores clotting substrate | | **Factor VIII** | 80–100 IU | Supports intrinsic pathway | | **von Willebrand factor** | 150–250 IU | Improves platelet adhesion | | **Fibronectin** | 50–100 mg | Supports hemostasis | | **Factor XIII** | 50–100 IU | Stabilizes fibrin clot | **High-Yield:** Cryoprecipitate is the ONLY product that should be used for isolated fibrinogen replacement; FFP is inefficient and causes volume overload. **Mnemonic:** **CRYO** = **C**oncentrated **R**eplacement **Y**ields **O**ptimal fibrinogen. ### Target Fibrinogen Level in DIC - **Goal:** Maintain fibrinogen >100 mg/dL (preferably >150 mg/dL) to support hemostasis. - **Transfusion trigger:** Fibrinogen <100 mg/dL with active bleeding or high risk of bleeding. - **Dosing:** 1 unit cryoprecipitate per 5–7 kg body weight raises fibrinogen by ~100 mg/dL. ### Why FFP Failed in This Case FFP contains fibrinogen but in dilute form; transfusing large volumes (10 units = 2 L) to raise fibrinogen adequately risks: - Pulmonary edema. - Dilutional coagulopathy (worsening thrombocytopenia and factor deficiency). - Hypervolemia in a patient already at risk for ARDS (adenocarcinoma + DIC). **Clinical Pearl:** In DIC, the coagulation cascade is being consumed faster than FFP can replace it. Cryoprecipitate's concentrated fibrinogen allows rapid correction without volume overload, giving hemostasis a better chance while the underlying disease is treated.