Shared decision-making about neuraxial analgesia in a patient with thrombocytopenia and pre-eclampsia
A 31-year-old primigravida at 34 weeks presents with BP 168/108, 3+ proteinuria, headache and visual disturbance. Platelets are 88 x 10^9/L and falling (was 130 two days ago), ALT 140, creatinine 95, and she has brisk reflexes with clonus. Fetal CTG shows reduced variability. The obstetric team plans category 1 caesarean section for fetal compromise. The patient is frightened and asks whether she can 'be awake and not feel anything'. The anaesthetic registrar suggests a spinal anaesthetic.
1. Analyse the risks and benefits of neuraxial anaesthesia in this patient and state what additional information you need.
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This is severe pre-eclampsia with HELLP-spectrum features: thrombocytopenia falling over 48 hours, transaminitis, renal impairment, headache and visual symptoms indicating severe disease, and a category 1 fetal indication. Neuraxial anaesthesia would allow an awake mother, avoid the pressor and airway response to laryngoscopy, and provide excellent analgesia, but the falling platelet count raises the risk of spinal or epidural haematoma, and the risk is highest with an epidural catheter. A spinal is generally considered at platelet counts above 70 to 80 x 10^9/L in the absence of other coagulopathy, but the trend matters more than the number: a count falling rapidly may be considerably lower by the time the needle is placed. Additional information needed urgently: repeat full blood count and coagulation profile including fibrinogen, a recent platelet count within the hour, evidence of haemolysis (LDH, haptoglobin, schistocytes), liver imaging if right upper quadrant pain, and the fetal status. I would also want to know whether magnesium has been given, whether there is any bleeding, and the airway assessment. Given the falling count, I would repeat the platelet count immediately before neuraxial block and have a low threshold for general anaesthesia if it has fallen further or coagulation is abnormal; I would discuss the options with the patient and the obstetric team, and ensure blood products are available.
2. How would you counsel the patient and plan anaesthesia, including management of severe hypertension and the airway?
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Counsel in plain language: explain that her blood pressure and blood results are severe, that the baby needs to be delivered quickly, and that the safest option depends on her platelet count, which is falling. Explain the trade-offs: an awake spinal avoids the risks of general anaesthesia in pregnancy (difficult airway, aspiration, hypertensive surge) but carries a small risk of bleeding around the spine, which is higher with an epidural catheter; general anaesthesia avoids the spinal bleed risk but carries airway and blood pressure risks. Document her preferences. Plan: treat severe hypertension before induction with intravenous labetalol or hydralazine to below 160/110, and give magnesium sulphate for seizure prophylaxis with monitoring for toxicity. Secure large-bore access, arterial line, and cross-matched blood. If platelets are adequate and stable, perform a single-shot spinal with a fine needle, using a reduced dose and careful positioning; avoid an epidural catheter. Have phenylephrine ready for hypotension but avoid over-treatment. If platelets are inadequate or falling, proceed to general anaesthesia with a rapid sequence induction, preoxygenation, aspiration prophylaxis, and a plan for difficult airway including video laryngoscopy and a second operator. Postoperatively, high-dependency care, continued magnesium and antihypertensive therapy, strict fluid balance, and vigilance for pulmonary oedema and eclampsia.