Sickle Cell Disease in Children
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Direct answer
Sickle cell disease in children is an inherited haemoglobinopathy in which haemoglobin S polymerises when deoxygenated, causing red cell sickling, vaso-occlusion and chronic haemolysis. Dactylitis in infancy, splenic sequestration, acute chest syndrome and stroke shape the early clinical course, and hydroxyurea and penicillin prophylaxis reduce these complications. Early diagnosis through newborn screening or haemoglobin electrophoresis matters, because pneumococcal infection remains a major cause of early death.
What you must remember
- Genotype: homozygous HbS (HbSS) gives the severe phenotype, while HbS beta-zero thalassaemia behaves like HbSS and HbS beta-plus thalassaemia and HbSC are usually milder.
- Dactylitis: painful swelling of hands and feet, often the first presentation between about six months and three years.
- Splenic sequestration: sudden splenic enlargement with falling haemoglobin, a life-threatening emergency that can recur.
- Acute chest syndrome: new lung infiltrate with fever, chest pain or hypoxia, a leading cause of morbidity and death.
- Stroke screening: transcranial Doppler from around age two; high velocities identify children at high stroke risk.
- Disease modification: hydroxyurea raises fetal haemoglobin and reduces pain crises and acute chest syndrome, while penicillin prophylaxis is continued into early childhood.
A preventive and acute care sequence
Management is preventive as well as acute, and each complication calls for a different immediate response.
- Prevent infection: penicillin prophylaxis from infancy, with pneumococcal, Hib, meningococcal and influenza vaccination on schedule.
- Treat vaso-occlusive pain early: hydration, warmth and analgesia given promptly, with opioids titrated to pain and monitored for breathing.
- Treat acute chest syndrome: antibiotics covering atypical organisms, oxygen, incentive spirometry, analgesia that does not depress breathing, and transfusion for severe cases.
- Respond to splenic sequestration: check haemoglobin and spleen size urgently and transfuse, with repeated episodes prompting planning for splenectomy.
- Prevent stroke: yearly transcranial Doppler from about age two, with transfusion programmes for abnormal velocities under specialist protocols.
- Start disease modification: hydroxyurea, offered to HbSS children from about nine months in current guidance and certainly for recurrent pain or acute chest syndrome, with regular count monitoring, and transplant considered for selected children. Fever in any child with sickle cell disease needs urgent review and empirical antibiotics, because functional asplenia makes sepsis rapid. Families need written advice on fever, hydration and early reporting of pain.
Where the exam tries to catch you
Sickle cell vignettes punish under-treatment of pain and missed emergencies.
- Trap: withholding opioids for pain because of dependence fears Correct: pain in sickle cell disease needs prompt and adequate analgesia, with monitoring.
- Trap: treating acute chest syndrome as simple pneumonia Correct: antibiotics are combined with oxygen, transfusion when needed and analgesia that protects breathing.
- Trap: dismissing sudden spleen enlargement with falling haemoglobin Correct: splenic sequestration can be fatal and needs urgent transfusion.
- Trap: stopping penicillin prophylaxis at the first well period Correct: pneumococcal risk persists into early childhood, so prophylaxis continues per protocol.
Frequently asked questions
What is dactylitis in sickle cell disease?
Dactylitis is painful, swollen hands and feet caused by vaso-occlusion in the small bones, often the first sign of sickle cell disease in infants. It usually occurs between about six months and three years of age.
What is the role of hydroxyurea in sickle cell disease in children?
Hydroxyurea raises fetal haemoglobin, which reduces sickling and lowers the frequency of pain crises and acute chest syndrome. It requires regular monitoring of blood counts and specialist supervision.
How is splenic sequestration recognised in children with sickle cell disease?
Splenic sequestration presents with sudden splenic enlargement and a fall in haemoglobin, sometimes with lethargy or shock. It is an emergency that needs urgent transfusion, and repeated episodes lead to consideration of splenectomy.
Why is transcranial Doppler screening done in sickle cell disease?
Transcranial Doppler identifies children with high cerebral blood flow velocities who face a high risk of stroke. Regular transfusion reduces that risk in children with abnormal results.
Why does penicillin prophylaxis matter in sickle cell disease?
Children with sickle cell disease develop functional asplenia through early autosplenectomy and are highly susceptible to pneumococcal infection. Penicillin prophylaxis started in infancy reduces the risk of severe pneumococcal sepsis in early childhood.