Add a suitable educational image showing sickled red cells, vaso-occlusion, acute chest syndrome and emergency care here.
Why this topic matters: Sickle cell disease (SCD) is an inherited haemoglobin disorder in which red cells can become rigid, adhesive and sickle-shaped. A crisis may be a painful vaso-occlusive episode, but severe infection, acute chest syndrome, stroke, acute anaemia, splenic sequestration, priapism and multiorgan failure can evolve rapidly. Pain must be treated promptly and respectfully while the team actively searches for life-threatening complications. Emergency medical students should know the patient's baseline, recognise atypical deterioration, prevent hypoxia and hypothermia, avoid harmful fluid overload, and escalate early.
Learning objectives
- Explain the inheritance, haemoglobin change, red-cell sickling and chronic haemolysis of SCD.
- Distinguish vaso-occlusive pain from acute chest syndrome, stroke, sepsis, splenic sequestration, aplastic crisis, haemolytic crisis, priapism and other emergencies.
- Perform rapid triage, ABCDE assessment, focused history, pain assessment and baseline neurological examination.
- Describe investigations, including full blood count, reticulocytes, blood film, cultures, chest imaging, blood gas, renal tests and type-and-crossmatch.
- Outline immediate analgesia, oxygenation, warming, hydration, incentive spirometry and treatment of triggers.
- Explain when simple or exchange transfusion is considered and why transfusion targets must be specialist-directed.
- Plan nursing monitoring, medicine safety, psychosocial support, discharge teaching and prevention.
1. Definition and haemoglobin biology
Sickle cell disease describes inherited disorders caused by abnormal beta-globin haemoglobin, most commonly haemoglobin SS, but also SC, Sβ⁰-thalassaemia, Sβ⁺-thalassaemia and other compound states. Sickle cell trait is different: most people with trait do not have SCD, although rare complications can occur in extreme physiological conditions. Confirm genotype from the patient record or laboratory testing rather than assuming it from appearance or a single haemoglobin value.
| Concept | What happens | Emergency relevance |
|---|---|---|
| Deoxygenated HbS polymerisation | When oxygen tension falls, HbS molecules polymerise and distort the red cell into a rigid sickle shape. | Hypoxia, acidosis, dehydration, fever, cold and stress can accelerate sickling. |
| Vaso-occlusion | Rigid, adhesive cells and activated endothelium obstruct small vessels, causing ischaemia and inflammation. | Produces severe pain, acute chest syndrome, stroke, bone infarction and organ injury. |
| Chronic haemolysis | Sickled cells have a shortened lifespan; haemoglobin is released and nitric oxide is consumed. | Baseline anaemia, jaundice, pigment gallstones, pulmonary hypertension and high-output stress may occur. |
| Functional asplenia | Repeated splenic infarction reduces clearance of encapsulated bacteria, especially in children with HbSS. | Fever may indicate rapidly progressive sepsis even when the patient initially looks well. |
| Endothelial and inflammatory activation | Leukocytes, platelets and endothelium interact with sickled cells, amplifying obstruction and pain. | Pain is real, complex and not reliably predicted by the haemoglobin level or physical examination. |
Clinical safety principle: A patient with SCD may have a low baseline haemoglobin and chronic pain history. Compare current findings with the individual's documented baseline, but never dismiss new pain, fever, chest symptoms or neurological change as “just their usual crisis.”
2. Triggers and risk factors
- Dehydration, vomiting, diarrhoea, poor intake, prolonged travel or inability to access fluids.
- Respiratory infection, malaria or other febrile illness, sepsis, acute chest infection and viral illness.
- Hypoxia, acidosis, high altitude, cold exposure, exhaustion or strenuous exertion.
- Pregnancy, surgery, anaesthesia, immobilisation and inadequate peri-operative oxygenation or analgesia.
- Emotional stress, sleep deprivation, untreated depression, domestic violence, stigma or delayed access to care.
- Missed hydroxyurea, penicillin prophylaxis, vaccination, folic acid or chronic transfusion appointments where these are prescribed.
- Smoking, tobacco exposure, alcohol, unregulated medicines, nephrotoxins and poor access to disease-modifying treatment.
2.1 A practical trigger screen: SICKLE
SICKLE
S – Sepsis, sick contact or surgery · I – Intake, infection and inadequate hydration · C – Chest symptoms, cold or carbon monoxide · K – Known baseline, genotype and medicines · L – Low oxygen, late pregnancy or laboratory change · E – Exertion, emotional stress, exposure and missed treatment.
S – Sepsis, sick contact or surgery · I – Intake, infection and inadequate hydration · C – Chest symptoms, cold or carbon monoxide · K – Known baseline, genotype and medicines · L – Low oxygen, late pregnancy or laboratory change · E – Exertion, emotional stress, exposure and missed treatment.
3. Types of sickle cell emergency
| Emergency | Core features | Why it is dangerous |
|---|---|---|
| Vaso-occlusive pain episode (VOE) | Acute or worsening pain in bones, back, chest, abdomen or limbs without another better explanation. | Severe pain, immobility, dehydration and hypoventilation can precipitate acute chest syndrome and chronic organ injury. |
| Acute chest syndrome (ACS) | New pulmonary infiltrate plus fever, chest pain, cough, tachypnoea, hypoxia or respiratory symptoms during SCD. | Can progress rapidly to respiratory failure, pulmonary hypertension, sepsis and death; treat as a medical emergency. |
| Stroke/TIA | Sudden weakness, facial asymmetry, speech or visual change, seizure, confusion or altered consciousness. | Ischaemic and haemorrhagic stroke occur; early imaging and transfusion pathway can reduce permanent injury. |
| Acute anaemic or haemolytic crisis | Sudden pallor, fatigue, dyspnoea, tachycardia, jaundice, dark urine, syncope or a marked Hb fall. | Reduced oxygen delivery, cardiac strain and shock may develop. |
| Splenic or hepatic sequestration | Rapid splenic/abdominal enlargement, pallor, weakness, tachycardia and falling Hb; usually in young children but hepatic sequestration can affect adults. | Large-volume pooling can cause hypovolaemic shock. |
| Aplastic crisis | Sudden anaemia with an inappropriately low reticulocyte count, often after parvovirus infection. | Severe reduction in red-cell production can cause collapse, especially in children. |
| Sepsis/meningitis | Fever, rigors, lethargy, hypotension, confusion, neck stiffness or respiratory symptoms. | Functional asplenia increases risk of overwhelming infection. |
| Priapism | Painful erection lasting four hours or longer, often recurrent or stuttering. | Prolonged ischaemia causes erectile dysfunction; urgent urological treatment is needed. |
| Multiorgan failure | Severe VOE with hypoxia, renal/liver injury, encephalopathy, coagulopathy or shock. | Requires critical-care and haematology escalation, often exchange transfusion consideration. |
4. Vaso-occlusive pain episode
4.1 Assessment
- Ask the patient where the pain is, when it began, how it feels, severity, prior treatment, usual crisis pattern and what has helped before.
- Do not use a low pain score from a quiet patient to exclude severe pain; observe function, breathing, movement, hydration and distress.
- Search for red flags: fever, chest pain, cough, dyspnoea, focal neurology, severe headache, abdominal distension, pallor, jaundice, dark urine, priapism, pregnancy or trauma.
- Assess pain in children using age-appropriate tools and include the caregiver's description of baseline behaviour and previous episodes.
4.2 Immediate emergency care
- Move the patient to a timely analgesia pathway; attach observations and obtain IV access if needed without delaying pain treatment.
- Give the patient's individualised analgesia plan when available. Use prescribed paracetamol/acetaminophen, NSAID when renal function and bleeding risk allow, and opioid analgesia for moderate-to-severe pain according to local protocol.
- Reassess pain and sedation at defined intervals; use a bolus and reassessment approach rather than an unmonitored large dose. Consider patient-controlled analgesia only in an appropriate monitored setting.
- Keep the patient warm, calm and gently positioned. Use heat, relaxation, music, guided breathing and family support as adjuncts—not substitutes for analgesia.
- Assess hydration clinically. Give oral fluids if safe; use cautious isotonic IV fluid only for dehydration or another clear indication, avoiding routine over-hydration.
- Give oxygen for documented hypoxaemia or respiratory distress, not automatically to every patient with pain.
- Use incentive spirometry, upright positioning and mobilisation as tolerated, especially in hospitalised patients with chest/back pain or opioid use.
Respectful care: Previous repeated admissions do not prove drug-seeking. Ask about the patient's personalised pain plan, previous effective dose and functional goals; assess objectively for complications while providing timely, non-judgemental analgesia.
5. Acute chest syndrome
Acute chest syndrome is a life-threatening new pulmonary illness in SCD. It may be caused by infection, fat embolism, pulmonary infarction, atelectasis or hypoventilation after surgery/opioids. It can begin with pain and only later develop hypoxia, so repeated reassessment is essential.
5.1 Clinical clues
- New cough, fever, tachypnoea, chest pain, wheeze, crackles, hypoxia, increased work of breathing or a new infiltrate.
- Unexplained falling oxygen saturation, rising respiratory rate, fatigue, confusion or inability to speak.
- Rapid Hb fall, thrombocytopenia, worsening pain, haemoptysis or signs of sepsis.
5.2 Management priorities
- Call senior/haematology and critical-care help early. Perform ABCDE, continuous SpO₂/ECG monitoring and frequent respiratory observations.
- Give titrated oxygen to the local target, obtain chest imaging, blood gas when severe, cultures when infection is suspected and urgent full blood count/reticulocytes.
- Start prescribed broad-spectrum antibiotics promptly when infection or ACS is suspected, following local resistance and malaria/sepsis protocols.
- Provide adequate analgesia without oversedation; monitor respiratory rate, sedation score and carbon-dioxide retention risk.
- Use incentive spirometry while awake, physiotherapy and careful mobilisation; treat bronchospasm if present.
- Transfusion may be simple or exchange depending on Hb, oxygenation, clinical severity and progression. Avoid raising Hb above the specialist target because hyperviscosity can worsen flow.
- Escalate for NIV/intubation when respiratory fatigue, refractory hypoxia, reduced consciousness, shock or worsening gas exchange develops.
6. Neurological emergencies and stroke
- Any sudden focal deficit, aphasia, facial droop, seizure, severe headache, visual change, ataxia or altered consciousness is a stroke emergency until proven otherwise.
- Record last-known-well time, glucose, GCS, pupils, limb power, speech, sensation, gait when safe and seizure duration.
- Activate the local stroke pathway, obtain urgent brain imaging and involve haematology. Do not delay specialist transfusion assessment while waiting for a “sickle crisis” label.
- Ischaemic stroke may require urgent simple or exchange transfusion to reduce HbS percentage; haemorrhage needs neurosurgical/critical-care care and a different transfusion strategy.
- Maintain oxygenation, normoglycaemia, temperature and safe blood pressure according to stroke protocol; keep nil by mouth until swallow assessment.
- After the acute episode, children and selected adults need transcranial Doppler surveillance and a secondary-stroke prevention plan.
7. Fever, sepsis and infection
Functional asplenia means fever can progress rapidly. A temperature around 38.5°C or higher, rigors, toxic appearance, respiratory symptoms, hypotension or altered behaviour needs urgent hospital assessment.
| Action | Practical details | Reason |
|---|---|---|
| Recognise | Check temperature, pulse, respiratory rate, BP, SpO₂, mental status, perfusion and urine output; compare with baseline. | Early sepsis can be subtle in a chronically anaemic patient. |
| Investigate | Blood cultures before antibiotics when this will not cause delay, FBC, reticulocytes, renal/liver tests, lactate, urinalysis and chest imaging as indicated. | Identifies bacteremia, ACS, haemolysis and organ dysfunction. |
| Treat | Give prompt prescribed antibiotics, oxygen for hypoxia, cautious fluids for shock and source-control treatment according to local sepsis protocol. | Delay increases risk of overwhelming infection. |
| Prevent | Review vaccines, penicillin prophylaxis in children where prescribed, malaria prevention, hand hygiene and sick-day advice. | Prevention is a core part of SCD emergency care. |
8. Acute anaemia, haemolysis and sequestration
8.1 Acute anaemic crisis
- Suspect with a fall in Hb from baseline, pallor, fatigue, tachycardia, dyspnoea, syncope, heart failure, jaundice or dark urine.
- Check FBC, reticulocyte count, bilirubin, LDH, haptoglobin where available, blood film, renal function, type-and-screen and crossmatch.
- High reticulocytes suggest haemolysis/sequestration; low reticulocytes suggest aplastic crisis or marrow suppression.
- Transfusion is specialist-directed and may be simple or exchange; check antibodies and previous transfusion reactions carefully.
8.2 Splenic or hepatic sequestration
- Look for sudden abdominal enlargement, pallor, weakness, tachycardia, hypotension and a rapidly falling Hb, especially in a child.
- Call resuscitation and haematology help, obtain large-bore access, monitor perfusion and prepare blood urgently.
- Use cautious fluid resuscitation if shock is present and avoid delaying transfusion assessment; repeated episodes require a prevention plan.
8.3 Aplastic crisis
- Parvovirus B19 may cause fever, pallor and profound anaemia with reticulocytopenia.
- Use infection precautions where indicated, confirm reticulocytes and arrange transfusion/haematology review; assess siblings or pregnant contacts through appropriate services.
9. Priapism
- Ask sensitively about duration, pain, previous episodes, urinary symptoms, medicines and sexual function.
- An erection lasting four hours or more is an emergency. Do not send the patient away with reassurance or rely on oral fluids alone.
- Provide analgesia, hydration only if indicated, oxygen for hypoxia, and urgent urology/haematology consultation for aspiration, irrigation, intracavernosal treatment or exchange transfusion as locally available.
- Recurrent stuttering priapism needs specialist prevention, not repeated emergency treatment without follow-up.
10. Other acute complications
| Complication | Clues | Emergency approach |
|---|---|---|
| Bone infarction/osteomyelitis | Focal bone pain, swelling, fever, reduced movement or persistent pain unlike usual VOE. | Examine, obtain cultures/imaging as indicated and treat infection and pain; do not assume every limb pain is uncomplicated VOE. |
| Septic arthritis | Hot swollen joint, severe movement pain, fever or systemic toxicity. | Urgent orthopaedic assessment, aspiration/culture and antibiotics. |
| Acute kidney injury | Oliguria, dark urine, proteinuria, hypertension, oedema, electrolyte or acid-base abnormality. | Track urine output, stop nephrotoxins, adjust medicines and involve renal specialists. |
| Gallstone/hepatic crisis | Jaundice, RUQ pain, fever, vomiting or rapidly abnormal liver tests. | Ultrasound, infection assessment, analgesia, hydration strategy and surgical/medical review. |
| Acute eye event | Sudden visual loss, floaters, eye pain or trauma. | Urgent ophthalmology; avoid delay from labelling it as a routine crisis. |
| Pregnancy complication | Pain crisis, ACS, pre-eclampsia, fetal growth concern or thrombosis. | Joint obstetric, haematology, anaesthetic and neonatal planning; medicine safety is individualised. |
| Venous thromboembolism | Sudden dyspnoea, pleuritic pain, unilateral swelling, syncope or unexplained tachycardia. | ABCDE, ECG/oxygen, validated imaging pathway and anticoagulation/reperfusion review. |
11. Focused history and examination
| Domain | Ask or examine | Why it matters |
|---|---|---|
| Baseline SCD | Genotype, usual Hb, usual pain sites, ACS/stroke history, transfusion antibodies, organ complications and individual care plan. | Separates chronic baseline from dangerous change and prevents incompatible transfusion choices. |
| Current crisis | Onset, site, severity, function, pain plan used, response, oral intake and triggers. | Guides analgesia and identifies atypical disease. |
| Chest and infection | Fever, cough, chest pain, dyspnoea, sick contacts, sputum, travel, malaria exposure and vaccination. | ACS and sepsis may be present together. |
| Neurology | Last-known-well, weakness, speech, vision, headache, seizure and confusion. | Activates time-critical stroke care. |
| Anaemia/haemolysis | Pallor, fatigue, jaundice, dark urine, bleeding, splenic enlargement and syncope. | Finds sequestration, aplasia and haemolysis. |
| Medicines and access | Hydroxyurea, penicillin, folate, chelation, analgesics, anticoagulants, allergies, missed doses, pharmacy access and previous reactions. | Prevents omissions, toxicity and avoidable readmission. |
| Psychosocial care | School/work, transport, pain stigma, mood, family support, safeguarding, pregnancy possibility and preferred communication. | Improves trust, adherence and safe discharge. |
12. ABCDE assessment
- Safety and help: move to a monitored area, call senior emergency, haematology, paediatric, obstetric or critical-care support based on presentation, and bring analgesia, oxygen, suction, blood-sampling and resuscitation equipment.
- Airway: assess voice, patency, secretions, vomiting and consciousness; prepare airway support for stroke, seizure, opioid toxicity or fatigue.
- Breathing: rate, effort, ability to speak, SpO₂, chest expansion, auscultation, temperature and cough; suspect ACS early even before a radiograph is available.
- Circulation: pulse, BP, capillary refill, skin, hydration, JVP, oedema, IV access, urine output and signs of shock; obtain blood samples and type-and-crossmatch when indicated.
- Disability: pain score, sedation score, glucose, GCS, pupils, focal deficits, seizure and severe headache.
- Exposure: inspect painful areas, swelling, joints, abdomen/spleen, jaundice, pressure areas, priapism when relevant and pregnancy signs; preserve warmth and dignity.
- Reassess: after each analgesic, oxygen, fluid, antibiotic or transfusion decision; record trends and escalate deterioration.
13. Investigations
| Investigation | Purpose | Safety/interpretation |
|---|---|---|
| Full blood count and reticulocytes | Hb baseline/fall, white cells, platelets and marrow response. | Interpret against the patient's usual Hb; low reticulocytes suggest aplasia. |
| Blood film | Sickled cells, target cells, haemolysis, malaria parasites or schistocytes. | Do not use film alone to diagnose genotype or severity. |
| Group, screen and crossmatch | Prepares for simple or exchange transfusion. | Record antibodies and prior reactions; involve blood bank early. |
| Blood cultures and infection tests | Sepsis, bacteremia, malaria, viral or bacterial source. | Draw cultures promptly but never delay antibiotics in an unstable patient. |
| Urea, creatinine, electrolytes, glucose | Renal injury, dehydration, medicine safety and metabolic triggers. | Guides fluid, NSAID and opioid decisions. |
| Bilirubin, LDH, liver tests | Haemolysis and hepatic/biliary complication. | Trend results; interpret with baseline and clinical findings. |
| Chest X-ray and lung ultrasound | New infiltrate, ACS, pneumonia, oedema or effusion. | A normal early image does not exclude evolving ACS; repeat if symptoms progress. |
| ECG/troponin | Hypoxia, chest pain, dysrhythmia or myocardial injury. | SCD patients can have cardiac disease; do not assume chest pain is only VOE. |
| Blood gas/lactate | Severe hypoxia, hypercapnia, acidosis and shock. | Use in respiratory distress or critical illness; escalate with worsening trends. |
| CT/MRI brain and vascular imaging | Stroke, haemorrhage, cerebral venous thrombosis or other focal deficit. | Record last-known-well and stabilise ABCs without losing the time window. |
| Urinalysis, pregnancy test and focused imaging | Renal disease, pregnancy, biliary disease, splenic enlargement, bone/joint infection or VTE. | Choose imaging according to symptoms and pregnancy status. |
14. Transfusion principles
- Transfusion is not routine treatment for uncomplicated pain alone. It is considered for selected acute anaemia, ACS, stroke, sequestration, multiorgan failure and peri-operative situations.
- Simple transfusion raises oxygen-carrying capacity but can increase viscosity. It is often considered for acute symptomatic anaemia or selected moderate ACS.
- Exchange transfusion removes sickled cells while replacing with donor red cells and is considered for severe/progressive ACS, acute stroke, severe multiorgan failure or other specialist indications.
- Do not transfuse to a target Hb above the specialist-recommended range; hyperviscosity may worsen microvascular flow.
- Check ABO/Rh compatibility, extended phenotype/genotype matching where available, antibody history, consent, baseline observations and reaction monitoring.
- Watch for acute haemolytic reaction, delayed haemolytic reaction, alloimmunisation, iron overload, circulatory overload, hypocalcaemia and transfusion-transmitted infection.
Escalation rule: In severe ACS, stroke or rapidly worsening multiorgan disease, call haematology and critical care while blood is being prepared. Do not wait for the Hb result to “look low enough” before seeking specialist advice.
15. Medicines and supportive therapy
| Therapy | Role | Safety considerations |
|---|---|---|
| Paracetamol/acetaminophen | Foundation analgesia for mild to moderate pain and combination therapy. | Check total daily dose, liver disease and combination products. |
| NSAID | Short course for selected inflammatory/bone pain when renal function and bleeding risk permit. | Avoid or modify in AKI, dehydration, GI bleeding, anticoagulation, pregnancy-specific situations or severe asthma sensitivity. |
| Opioid | Moderate-to-severe VOE pain or ACS pain under a protocol. | Monitor respiratory rate, sedation, oxygenation, nausea, constipation and dependence risk; titrate to functional comfort. |
| Antibiotics | Fever, sepsis, pneumonia or ACS when infection is possible. | Use local antimicrobial guidance, cultures and renal adjustment; do not delay in shock. |
| Hydroxyurea | Disease-modifying therapy increasing fetal haemoglobin and reducing crises for eligible patients. | Long-term specialist medicine; check adherence, blood counts, pregnancy advice and toxicity monitoring. |
| Folate and preventive antibiotics | Supportive and infection-prevention therapy where prescribed. | Review actual access and adherence rather than assuming the patient has supplies. |
| Anticoagulation | VTE treatment or prophylaxis when indicated by risk and diagnosis. | Assess bleeding, platelet count, renal function, pregnancy and transfusion plan. |
16. Nursing management
16.1 Priority monitoring
- Pain score, functional goal, sedation score, respiratory rate, SpO₂, oxygen device, chest findings and temperature.
- Pulse, BP, rhythm, capillary refill, skin, hydration, urine output and mental status.
- Neurological observations, pupils, limb power, speech, seizure activity and last-known-well time when relevant.
- Hb/reticulocytes, platelets, white count, renal/liver trend, lactate, cultures and transfusion observations.
- IV site, pump, opioid effect, antibiotic timing, incentive-spirometry use, mobility, pressure areas and constipation.
16.2 Interventions and rationales
| Intervention | Rationale and practical action |
|---|---|
| Give timely analgesia | Prompt, individualised pain relief reduces stress, hypoventilation and delayed presentation; reassess effect and adverse effects. |
| Prevent hypoxia and hypothermia | Warmth, oxygen for hypoxaemia, upright positioning and chest observation reduce sickling triggers and respiratory deterioration. |
| Encourage safe breathing and mobility | Incentive spirometry, coughing, physiotherapy and gentle mobilisation reduce atelectasis and ACS risk. |
| Balance fluids | Offer oral fluids when safe and use prescribed IV fluid only for clear need; document input/output and signs of overload. |
| Administer medicines safely | Check allergies, renal/liver function, interactions, sedation, pregnancy status and the five rights; avoid repeated unreviewed opioids or NSAIDs. |
| Support transfusion | Verify identity and compatibility, baseline observations, consent, infusion rate and reaction signs; document the unit and response. |
| Communicate respectfully | Use the patient's care plan, validate pain, explain procedures, provide privacy and involve family with consent. |
| Escalate early | Use SBAR with baseline Hb, current trend, SpO₂, respiratory rate, pain response, urine output, neurological change and exact request. |
17. Disposition and discharge
- ICU/HDU: refractory hypoxia, severe ACS, shock, altered consciousness, seizure, stroke, multiorgan failure, invasive ventilation or exchange transfusion.
- Inpatient monitored care: fever/sepsis, moderate ACS, acute anaemia, uncontrolled pain, high opioid requirement, AKI, sequestration, pregnancy complication or inability to maintain oral intake.
- Safe discharge: pain controlled on a realistic plan, no red flags, stable observations, adequate intake/urine output, clear medicines, follow-up, transport and return precautions.
- Provide written advice to return urgently for fever, chest pain, breathlessness, severe headache, weakness/speech change, seizure, abdominal swelling, pallor/fainting, prolonged priapism, dark urine or uncontrolled pain.
- Review hydroxyurea and preventive medicines, vaccinations, malaria prevention, penicillin where prescribed, reproductive goals, mental health, school/work and pain-plan access.
18. Prevention and chronic care
- Hydroxyurea or another disease-modifying plan when eligible; monitor full blood count and adherence through the SCD team.
- Vaccination against pneumococcus, meningococcus, Haemophilus influenzae, influenza and other locally recommended infections.
- Penicillin prophylaxis in children when prescribed; prompt fever assessment and malaria prevention in endemic areas.
- Regular transcranial Doppler screening for children at stroke risk, eye review, renal/BP monitoring, pulmonary and cardiac assessment.
- Hydration, warmth, safe exercise, sleep, nutrition, folate where prescribed, smoking cessation and avoidance of unregulated remedies.
- Individual emergency plan: genotype, baseline Hb, antibodies, analgesia plan, transfusion history, specialist contacts and preferred hospital.
- Address stigma and barriers. Shared decision-making, patient education and reliable medicine access prevent avoidable emergency visits.
19. Worked clinical scenarios
Scenario 1: Uncomplicated vaso-occlusive pain
A 22-year-old with HbSS presents with severe back and limb pain after several days of poor intake. SpO₂ is normal, there is no fever, chest symptom or neurological deficit, and Hb is close to baseline. The nurse validates the pain, starts the individualised analgesia pathway promptly, offers oral fluids, keeps the patient warm, reassesses sedation and pain, and searches for a trigger without automatically ordering a transfusion.
Scenario 2: Evolving acute chest syndrome
A patient admitted for rib pain develops fever, tachypnoea, falling SpO₂ and a new infiltrate. The team calls haematology/critical care, starts oxygen, cultures and antibiotics, obtains repeat imaging and blood gas, gives carefully monitored analgesia, encourages incentive spirometry and prepares transfusion assessment. Increasing fatigue or hypoxia triggers escalation for respiratory support and possible exchange transfusion.
Scenario 3: Acute stroke
A child with SCD suddenly develops right-sided weakness and slurred speech. Last-known-well time and glucose are recorded, ABCDE is performed, the stroke pathway is activated, urgent imaging and haematology review are arranged, and the team avoids delays caused by assuming the deficit is pain or sedation. Exchange transfusion assessment begins urgently.
Scenario 4: Acute anaemia and sequestration
A six-year-old becomes pale and lethargic with tachycardia and a rapidly enlarging spleen. The nurse recognises possible sequestration, calls resuscitation and haematology, obtains large-bore access, checks Hb/reticulocytes and crossmatch, monitors perfusion and prepares blood while using cautious shock resuscitation.
Scenario 5: Fever and pain
A teenager presents with limb pain and a temperature of 39°C. Pain treatment proceeds promptly, but fever is treated as possible sepsis: cultures, FBC, lactate, renal tests, malaria assessment where relevant, chest examination and prescribed antibiotics are arranged. The patient is not discharged simply because the pain resembles previous crises.
SICKLE-SAFE
S – Search for sepsis, stroke and severe chest disease · I – Identify baseline Hb, genotype and care plan · C – Control pain promptly and compassionately · K – Keep oxygenation, warmth and hydration safe · L – Look for anaemia, sequestration, priapism and renal injury · E – Escalate early to haematology/critical care · S – Spirometry and surveillance · A – Assess transfusion need and antibodies · F – Fever is an emergency until evaluated · E – Educate, prevent and ensure follow-up.
S – Search for sepsis, stroke and severe chest disease · I – Identify baseline Hb, genotype and care plan · C – Control pain promptly and compassionately · K – Keep oxygenation, warmth and hydration safe · L – Look for anaemia, sequestration, priapism and renal injury · E – Escalate early to haematology/critical care · S – Spirometry and surveillance · A – Assess transfusion need and antibodies · F – Fever is an emergency until evaluated · E – Educate, prevent and ensure follow-up.
20. Examination and revision questions
- Explain HbS polymerisation, vaso-occlusion, haemolysis and functional asplenia.
- Differentiate uncomplicated VOE from acute chest syndrome, sepsis, stroke and acute anaemia.
- Describe the first-hour management of severe sickle pain.
- List the clinical and radiological features of acute chest syndrome.
- When is simple or exchange transfusion considered, and why should Hb not be raised excessively?
- Outline the assessment of a child with suspected splenic sequestration.
- Describe emergency management of acute focal neurological deficit in SCD.
- Explain safe nursing monitoring for opioids, IV fluids, antibiotics and transfusion.
- Discuss priapism, fever, renal injury, osteomyelitis and pregnancy as SCD emergencies.
- Prepare a discharge and prevention plan for a patient with recurrent VOE.
Key takeaways
- Rapid analgesia and respectful assessment are essential, but pain must never stop the team searching for complications.
- Acute chest syndrome, stroke, sepsis, acute anaemia, sequestration and priapism are time-critical emergencies.
- Compare current results with the individual's baseline Hb, oxygenation and functional state.
- Oxygen is for hypoxaemia, fluids are cautious and transfusion targets are specialist-directed.
- Incentive spirometry, warmth, safe mobility, infection prevention and careful opioid monitoring reduce deterioration.
- Early haematology, blood-bank, obstetric, paediatric and critical-care communication saves time.
- Prevention includes disease-modifying therapy, vaccination, prophylaxis, screening, education and an accessible individual emergency plan.
Suggested references
- American Society of Hematology. Clinical practice guidelines for sickle cell disease.
- ASH pocket guide: Management of acute complications of sickle cell disease.
- National Heart, Lung, and Blood Institute. Health effects of sickle cell disease.
- CDC. Acute chest syndrome and other sickle-cell complications.
- World Health Organization. Sickle-cell disease fact sheet and global care guidance.
- Use current Uganda Ministry of Health, haematology, emergency, transfusion, malaria, paediatric and obstetric protocols for local treatment, blood availability and referral.