Sickle Cell Disease in Children

A child with sickle cell disease and sudden splenic enlargement can bleed out internally within hours — the spleen that once protected them becomes the threat.

Sickle cell disease (SCD) is an autosomal recessive hemoglobinopathy where abnormal hemoglobin S causes red blood cells to sickle under low-oxygen conditions, occluding small vessels and triggering vaso-occlusive crises (VOC). In children, the primary nursing concerns are pain management during VOC, prevention and early recognition of life-threatening complications, and hydration. Splenic sequestration crisis — sudden pooling of blood in the spleen — presents with rapidly enlarging spleen, falling hemoglobin, tachycardia, and pallor; it is a pediatric emergency most common in children under 5. Acute chest syndrome (fever, chest pain, new pulmonary infiltrate, hypoxia) is the leading cause of death. Aplastic crisis, often triggered by parvovirus B19, causes a sudden drop in reticulocyte count and severe anemia. Stroke risk peaks between ages 2 and 16; transcranial Doppler screening begins at age 2 annually. Hydroxyurea is the mainstay preventive medication — it increases fetal hemoglobin (HbF), which resists sickling. Penicillin prophylaxis starts by 2 months of age and continues through at least age 5 to prevent pneumococcal sepsis, because functional asplenia develops early. For severe VOC pain, opioid analgesics (morphine, hydromorphone) are first-line — not NSAIDs alone. Key triggers to teach families to avoid: cold exposure, dehydration, high altitude, strenuous exercise, and infection.

Key Distinctions

Don't confuse splenic sequestration (rapidly enlarging spleen, dropping Hgb) with VOC pain crisis (severe pain but stable spleen). Students mix up aplastic crisis (low reticulocytes, parvovirus B19) with sequestration crisis (blood trapped in spleen, reticulocytes still elevated). Hydroxyurea increases fetal hemoglobin to prevent sickling — it does not treat an acute crisis. Don't confuse sickle cell trait (HbAS — usually asymptomatic carrier, one copy of HbS) with sickle cell disease (HbSS — two copies, symptomatic). Trait carriers generally do not need prophylactic penicillin or hydroxyurea.

Clinical Pearl

Hydrate, assess oxygenation, medicate — in that order. Push IV fluids first, apply supplemental O2 only if SpO2 drops below 95%, then administer opioid analgesics promptly. Never undertreat sickle cell pain.