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Sickle Cell Anemia

Hereditary hemoglobinopathy with vaso-occlusive crises, chronic hemolysis, and organ damage

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Hematoloji department. Book Appointment →

What is Sickle Cell Anemia?

Sickle cell anemia is caused by a single amino acid substitution (β6 Glu→Val) in the β-globin chain producing HbS. Under deoxygenated conditions, HbS polymerizes, deforming erythrocytes into sickle shape, causing hemolysis and microvascular occlusion.

Genotypes include HbSS (sickle cell anemia, most severe), HbSC, HbS-β0 thalassemia, and HbS-β+ thalassemia. Heterozygous HbAS (sickle cell trait) is generally asymptomatic but carries risks in extreme conditions.

Clinical manifestations include painful vaso-occlusive crises, acute chest syndrome, stroke, splenic sequestration, aplastic crisis (parvovirus B19), avascular necrosis, priapism, nephropathy, retinopathy, and leg ulcers.

Newborn screening, penicillin prophylaxis in children, pneumococcal and meningococcal immunization, transcranial Doppler monitoring, and hydroxyurea are cornerstones of prevention. Novel therapies — crizanlizumab, voxelotor, L-glutamine, and gene therapy (exa-cel, lovo-cel) — expand options.

Symptoms

Painful vaso-occlusive crisis: severe extremity, back, abdomen, or chest pain
Acute chest syndrome: fever, chest pain, dyspnea, hypoxia — a medical emergency
Dactylitis (hand-foot syndrome) in young children
Jaundice from chronic hemolysis, pallor, fatigue
Stroke symptoms (focal neurologic deficit), splenic sequestration (splenomegaly with acute anemia)
Priapism, leg ulcers, avascular necrosis of hips, retinopathy, chronic kidney disease

Risk Factors

Autosomal recessive inheritance (HbSS and compound heterozygous states)
Ancestry from malaria-endemic regions: sub-Saharan Africa, Mediterranean, Middle East, India
Consanguinity
Triggers for crises: infection, dehydration, cold, hypoxia, stress, high altitude, extreme exertion
Comorbid obstructive sleep apnea, asthma, or iron overload from chronic transfusion
Genetic modifiers: fetal hemoglobin level, α-thalassemia co-inheritance

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Fever ≥38.5°C, acute chest symptoms, focal neurologic deficit, priapism >4 hours, severe pain uncontrolled at home, or acute pallor with splenomegaly in a child requires emergency evaluation.
  • Painful crisis not responding to home analgesia, persistent vomiting, dehydration, or suspected infection warrants emergency department care.
  • Routine care includes hematology follow-up every 3-12 months, transcranial Doppler screening in children 2-16, retinal exams, renal function, and pulmonary assessment.

Treatment Methods

01
Disease-modifying: hydroxyurea as first-line for HbSS and severe HbSβ0 to reduce crisis frequency and acute chest syndrome; L-glutamine as add-on.
02
Novel agents: crizanlizumab (anti-P-selectin) to reduce vaso-occlusive crisis; voxelotor (HbS polymerization inhibitor) to raise hemoglobin and reduce hemolysis.
03
Transfusion therapy: chronic transfusion for primary or secondary stroke prevention, acute chest syndrome, pre-operative preparation; iron chelation with deferasirox or deferoxamine for iron overload.
04
Pain management: tailored opioid and non-opioid analgesia, hydration, oxygen as needed; incentive spirometry and early mobilization to prevent acute chest syndrome.
05
Curative options: allogeneic hematopoietic stem cell transplant (matched sibling donor); gene therapy with exa-cel (CRISPR) or lovo-cel (lentiviral) for eligible patients.
06
Comprehensive care: vaccinations, penicillin prophylaxis in children, folate supplementation, psychosocial support, reproductive counseling, and multidisciplinary care in specialized centers.

Which Department to Visit?

You can visit our Hematoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.