Postpartum headache with thalamic haemorrhage: anticoagulating cerebral venous thrombosis
A 29-year-old woman, 9 days after an emergency caesarean section, presents with 5 days of progressive holocranial headache that is worse lying flat and on Valsalva, and two generalised tonic–clonic seizures in the emergency department. She is breastfeeding, afebrile, BP 122/78 mmHg, and has bilateral papilloedema. Platelets 214 × 10⁹/L, INR 1.0, creatinine 70 µmol/L. Non-contrast CT shows a hyperdense straight sinus and bilateral thalamic hypodensity with a small focus of haemorrhage in the right thalamus. MRI with MR venography confirms extensive thrombosis of the internal cerebral veins, vein of Galen and straight sinus, with bilateral thalamic venous infarcts, one haemorrhagic. She is drowsy (GCS 13) but protecting her airway. The on-call resident is reluctant to start anticoagulation because of the haemorrhage and asks whether she should be transferred to a neurosurgical centre 3 hours away for decompression.
1. Should she be anticoagulated now, given the thalamic haemorrhage? Give your decision with the reasoning, the agent and monitoring you would choose, and what you would do if the haemorrhage expands.
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Decision: start therapeutic anticoagulation now - the haemorrhage is not a contraindication.
Reasoning:
- The bleed is a venous infarct haemorrhage, produced by raised venous and capillary pressure behind an occluded sinus. It is usually petechial and does not behave like a primary hypertensive haematoma.
- The dominant risk is thrombus propagation into the internal cerebral veins and vein of Galen, which is what is producing her drowsiness and bilateral thalamic injury. Untreated, this can progress to coma and death; anticoagulation reduces that risk and improves outcome.
- Guidelines (ESO, AHA/ASA) recommend therapeutic heparin in CVT even when a haemorrhagic infarct is present.
Practical plan:
- Unfractionated heparin is the better choice here because she is drowsy, may need surgery, and has renal-adjacent concerns; it is short-acting and reversible with protamine. Bolus only if no large haematoma, then infusion to aPTT 1.5–2× control (or anti-Xa 0.5–0.7 IU/mL).
- Do not give platelet transfusions, vitamin K or prothrombin complex; do not use aspirin.
- Monitor GCS, pupils and repeat CT if she deteriorates.
- If the haemorrhage expands with mass effect, the answer is not to abandon anticoagulation permanently: briefly hold for surgery, then restart once haemostasis is secure. Refractory deterioration may justify endovascular thrombectomy/thrombolysis for the sinus at a specialist centre.
- Once stable, transition to LMWH, which is compatible with breastfeeding.
2. Which aetiological investigations would you order, and how would you avoid misinterpreting them? What duration of anticoagulation will you plan?
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Immediate provoking factor: pregnancy and the puerperium, plus caesarean delivery, are the most likely triggers; no other cause is found in most cases. Look also for dehydration, sepsis and mechanical factors.
Tests and their pitfalls:
- Antiphospholipid antibodies (lupus anticoagulant, anticardiolipin IgG/IgM, anti-β2-glycoprotein I): the highest-yield test in a young stroke patient, but acute thrombosis and anticoagulation cause false positives/negatives - so repeat at ≥12 weeks before diagnosing APS.
- Protein C, protein S, antithrombin: interpret only after the acute phase and off heparin/warfarin, otherwise results are uninterpretable.
- Factor V Leiden, prothrombin G20210A: low yield in this population but worth considering with a family history.
- JAK2 V617F if there is splanchnic or unusual site thrombosis; homocysteine; full blood count for myeloproliferative disease.
- In an Egyptian patient, actively consider Behçet disease (oral/genital ulcers, pathergy, uveitis/pseudophlebitis) and systemic vasculitis or malignancy.
- Do not order a full thrombophilia screen as a reflex during the acute admission.
Duration: pregnancy/postpartum-provoked CVT is usually treated for 3–6 months with LMWH or warfarin (both acceptable in breastfeeding); extend to 6–12 months or indefinitely if there is a persistent major thrombophilia, recurrence, or a strong family history. Avoid combined oestrogen contraception lifelong.
3. Her GCS falls to 9 over 8 hours. Outline your management, including the role of transfer to the neurosurgical centre 3 hours away, osmotherapy, corticosteroids and antiseizure medication.
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First, define the cause: repeat CT/MRI to distinguish expansion of the thalamic venous infarct with oedema from haemorrhage, hydrocephalus and status epilepticus; check glucose, sodium, CO₂, and review the heparin infusion.
Medical measures for raised ICP:
- Head up 30°, midline, avoid hypoxia and hypercapnia, avoid fever and hyperthermia; target normocapnia.
- Hypertonic saline (e.g. 3% bolus) or mannitol for acute deterioration; hypertonic saline is preferred if BP is labile or renal function is borderline.
- Brief hyperventilation only as a bridge to theatre.
- Corticosteroids are not indicated for venous infarct oedema; they do not help and add harm.
Anticoagulation continues unless there is a surgical reason to hold.
Transfer: deep venous infarction with bilateral thalamic involvement can cause rapid central herniation. If she is deteriorating despite osmotherapy, intubate and transfer for decompressive craniectomy - reports describe survival with good outcome after surgery for malignant deep venous infarction. Do not transfer a stable, improving patient purely for observation: three hours of road transport is a real risk. Discuss with the neurosurgical team before moving.
Seizures: her seizures were acute symptomatic. Use levetiracetam (breastfeeding-compatible; avoid valproate in a young woman). Continue for a limited period and reassess, since late seizures may warrant longer treatment. Treat non-convulsive status if the GCS drop is unexplained - obtain an EEG.