Postpartum Cerebral Venous Sinus Thrombosis With Hemorrhagic Infarct
A 31-year-old woman, 9 days postpartum after an uncomplicated vaginal delivery, presents 6 hours after a sudden severe holocranial headache followed by a right focal motor seizure and left hemiparesis. She is breastfeeding and has no prior thrombosis, migraine, or estrogen use. Blood pressure is 138/86 mmHg, platelets 210,000/µL, INR 1.0, creatinine 70 µmol/L. Noncontrast CT shows a hyperdense left transverse sinus and a 2-cm left temporal hemorrhagic venous infarct with mild midline shift. The nearest thrombectomy-capable center is 5 hours away by road, and the local hospital has CT venography but no neurointerventional suite. She is drowsy but obeying commands; fundoscopy shows bilateral papilledema. The team must decide on immediate imaging, anticoagulation, seizure prophylaxis, and postpartum contraception counseling.
1. What is the most likely diagnosis, and what immediate imaging and monitoring would you order before committing to anticoagulation?
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Most likely diagnosis: cerebral venous sinus thrombosis (CVST) involving the left transverse sinus, with a hemorrhagic venous infarct and secondary focal seizure. The postpartum state, thunderclap headache, papilledema, and CT hyperdensity fit; arterial stroke is less likely but must be excluded.
Immediate imaging and monitoring: CT venography or MR venography to define thrombus extent and assess herniation risk; repeat noncontrast CT if GCS drops. Check CBC, PT/INR, aPTT, renal function, pregnancy test, and later thrombophilia studies. Monitor GCS, pupils, seizures, blood pressure, and sodium; keep the head elevated and avoid hypotonic fluids. Involve neurosurgery early for hydrocephalus or herniation risk. Lumbar puncture is not needed for diagnosis and is risky with papilledema and midline shift; do it only if meningitis is a serious alternative after imaging.
Why not wait: anticoagulation is started even with a hemorrhagic venous infarct because the underlying process is venous occlusion and propagation; hemorrhagic transformation is not a contraindication. Start after confirming the diagnosis on venous imaging, not after a negative arterial CT.
2. How would you anticoagulate this patient given the hemorrhagic infarct and breastfeeding? Address agent choice, duration, and what would change your plan.
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Acute anticoagulation: start low-molecular-weight heparin, e.g., enoxaparin 1 mg/kg subcutaneously every 12 hours, or unfractionated heparin infusion if renal function is unstable or invasive procedures are likely. The hemorrhagic infarct does not preclude anticoagulation; the main contraindications would be uncontrolled major bleeding or a large established hemorrhage with mass effect, in which case discuss timing with neurosurgery and neurology.
Breastfeeding: LMWH and warfarin are compatible with breastfeeding; direct oral anticoagulants are not recommended because of limited infant safety data. If warfarin is chosen, bridge with LMWH until INR 2-3.
Duration: 3 months for a transient postpartum provoked event; 6-12 months or indefinite if severe thrombophilia, recurrence, or persistent risk. Repeat imaging at 3 months to confirm recanalization. Escalation: if GCS declines or the infarct expands, transfer for endovascular thrombectomy, but routine thrombectomy is not first-line. Seizures are treated with levetiracetam; prophylactic antiseizure drugs are not routine.
3. What contraception and future pregnancy advice would you give at discharge?
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Contraception: avoid combined estrogen-containing pills because they increase venous thrombosis risk. Recommend a progestin-only pill, etonogestrel implant, levonorgestrel IUD, or copper IUD. Barrier methods alone are less reliable.
Future pregnancy: counsel that pregnancy and the puerperium are high-risk periods. For a future pregnancy, start prophylactic LMWH early in pregnancy and continue through 6 weeks postpartum, with hematology input. Screen for antiphospholipid antibodies and inherited thrombophilia when off anticoagulation, but timing and interpretation matter; do not test while on heparin or warfarin.
Breastfeeding: LMWH and warfarin are safe; avoid DOACs. Red flags: recurrent headache, visual change, seizure, or focal deficit warrants urgent imaging. This plan addresses both recurrence risk and the safety of the infant.