Postpartum Hemorrhage with Disseminated Intravascular Coagulation
A 32-year-old G3P2 at 39 weeks presents in spontaneous labor. After an uncomplicated delivery, she has a postpartum hemorrhage with estimated blood loss of 1500 mL. She received oxytocin and misoprostol, but bleeding continues. Vital signs: BP 90/60, HR 130, RR 24, O2 sat 98%. She is pale and diaphoretic. Labs: Hb 7.5 g/dL, platelets 80,000/µL, PT 18 sec, aPTT 45 sec, fibrinogen 100 mg/dL. You suspect disseminated intravascular coagulation (DIC).
1. What is the most likely cause of the DIC in this patient, and what is the initial management priority?
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The most likely cause is placental abruption or uterine atony leading to massive hemorrhage and consumptive coagulopathy. In obstetric DIC, the trigger is often tissue factor release from placental separation or endothelial injury from shock. The initial management priority is resuscitation with blood products and simultaneous treatment of the underlying cause. She needs aggressive volume resuscitation, blood transfusion (packed RBCs, fresh frozen plasma, platelets, and cryoprecipitate for fibrinogen <100 mg/dL), and uterotonics. If uterine atony is the cause, consider uterine massage, additional uterotonics (carboprost, methylergonovine), and possibly tranexamic acid. If abruption, delivery is already accomplished. The key is to not delay blood products while awaiting lab results.
2. How would you interpret her coagulation profile, and what specific blood product replacement would you give?
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Her labs show thrombocytopenia (80,000/µL), prolonged PT and aPTT, and low fibrinogen (100 mg/dL), consistent with DIC. In DIC, there is consumption of platelets and coagulation factors. Replacement should be guided by clinical bleeding and labs: platelets if <50,000/µL with bleeding (or <20,000/µL), fresh frozen plasma if PT/aPTT >1.5 times normal, and **cryoprecipitate if fibrinogen <100 mg/dL**. She should also receive packed RBCs to maintain Hb >7-8 g/dL. Additionally, tranexamic acid can be considered. The goal is to maintain platelet count >50,000/µL, fibrinogen >100 mg/dL, and PT/aPTT <1.5 times normal. Treat the underlying cause (e.g., uterine atony) with uterotonics and possibly surgical intervention.