Weight-based emergency dosing for VOC, acute chest syndrome, splenic sequestration and aplastic crisis.
Protocol checklist, escalation triggers, transfusion thresholds, referral criteria.
British Society Haematology 2023 · Nigeria FMOH SCD Guidelines · Ghana Health Service 2022. Offline-capable.
For qualified healthcare professionals only.
Sickle cell crisis requires immediate clinical assessment. Dosing outputs are weight-based estimates; adjust for organ function and clinical response. Exchange transfusion for acute chest syndrome and stroke requires specialist haematology input.
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Nigeria has the highest burden of sickle cell disease (SCD) globally, with an estimated 150,000 babies born with SCD annually — approximately 2% of all Nigerian births. Ghana has the second highest burden in West Africa. Vaso-occlusive crisis (VOC) is the most common emergency presentation and the leading cause of SCD hospitalisation and preventable mortality. The cornerstone of VOC management is rapid, adequate analgesia — inadequate pain management leads to prolonged hospitalisation, psychological harm, and avoidable opioid complications. This pathway is based on British Society for Haematology (BSH) 2021 guidelines for sickle cell disease, adapted for Nigerian and Ghanaian clinical resource availability and the essential medicines list.
Ghana Health Service: Standard Treatment Guidelines — Sickle Cell chapter (7th ed.)
Frequently Asked Questions
For moderate-severe pain: IV or SC morphine 0.1 mg/kg (max 15 mg) every 20–30 minutes titrated to pain relief (target NRS ≤4). Add regular oral ibuprofen 400 mg every 8 hours and paracetamol 1g every 6 hours as background analgesia. Pethidine (meperidine) is absolutely contraindicated — its toxic metabolite norpethidine causes seizures with repeat dosing.
Simple transfusion: Hb drop >2 g/dL from baseline, aplastic crisis (parvovirus B19), sequestration. Exchange transfusion: acute stroke (target HbS <30%), acute chest syndrome with SpO₂ <90% despite oxygen, multi-organ failure, priapism >4 hours failing other treatment. Exchange transfusion is preferred over simple transfusion in acute chest syndrome to avoid hyperviscosity.
Pethidine is metabolised to norpethidine, which accumulates with repeated dosing and cannot be reversed by naloxone. Norpethidine causes CNS excitation, tremors, myoclonus, and seizures. The BSH 2021 guidelines explicitly contraindicate pethidine in sickle cell disease. It must be removed from all SCD emergency prescribing protocols.
Hydroxyurea (hydroxycarbamide) is the only WHO-recommended disease-modifying therapy for sickle cell disease. It increases foetal haemoglobin (HbF), reducing HbS polymerisation, sickling, and vaso-occlusive crises. It reduces annual crisis rate by approximately 50%, acute chest syndrome, stroke risk, and hospitalisation. It is available at many Nigerian tertiary and teaching hospitals as a generic preparation and is listed on the FMOH Nigeria essential medicines list. Dose: 10–15 mg/kg/day orally in adults and children, titrated up. Requires FBC monitoring every 4–8 weeks.
Exchange transfusion replaces sickled HbS-containing cells with donor HbA cells, rapidly reducing HbS% without the hyperviscosity risk of simple top-up transfusion. Indications for exchange (rather than simple) transfusion: acute stroke (target HbS below 30%), acute chest syndrome not responding to simple transfusion, priapism lasting more than 4 hours, multi-organ failure, and pre-operative preparation for major surgery in patients with HbSS. Simple transfusion raises Hb but does not reduce HbS percentage and can cause hyperviscosity if Hb exceeds 10 g/dL — this is dangerous in stroke and acute chest syndrome.