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Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Sickle Cell Disease

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In one line

·A child inherits two copies of a mutated hemoglobin gene (HbS). When oxygen runs low, the HbS protein inside red blood cells clumps together and bends the cells into a stiff crescent (sickle) shape. These sickle cells jam in small blood vessels and break apart, starving tissue and triggering pain and organ damage.

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Normal physiology

·Red blood cells are soft, round discs filled with hemoglobin A (HbA), the protein that carries oxygen from the lungs to every tissue. The cells are flexible enough to squeeze through the body's tiniest blood vessels (capillaries), deliver oxygen, pick up carbon dioxide, and return to the lungs. Each red cell lives about 120 days before the spleen filters it out and recycles it.

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What goes wrong

·A child inherits two copies of a mutated hemoglobin gene (one from each parent), so red cells make hemoglobin S (HbS) instead of normal hemoglobin A. When oxygen drops — during exercise, dehydration, cold weather, infection, or stress — HbS proteins inside the red cell stick together like Velcro, forming long, stiff rods. These rods force the cell to twist into a rigid crescent or sickle shape. Sickled cells cannot bend, so they jam in small blood vessels, blocking blood flow and starving tissue of oxygen. The sickled cells are also fragile and break apart after only 10 to 20 days (instead of 120), faster than the bone marrow can replace them, causing chronic anemia.

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Hallmark signs

·Pain crises (sudden, severe pain in bones, chest, belly, or joints)
·Swelling in hands and feet (dactylitis)
·Pale skin, gums, or nail beds (anemia)
·Yellowing of the skin and eyes (Jaundice) (yellow tint to skin and whites of eyes)
·Fatigue and weakness
·Frequent infections (especially lung and bone)
·Shortness of breath
·Delayed growth and puberty

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Red flags · escalate now

·Fever over 101°F (38.3°C) — may signal a life-threatening infection because the spleen is damaged
·Sudden, severe headache or weakness on one side — could be a stroke from blocked brain blood vessels
·Chest pain, trouble breathing, or coughing — may be acute chest syndrome (sickle cells clogging lung vessels), a top cause of death
·Sudden, severe belly pain or swelling — could be splenic sequestration (the spleen traps a huge amount of blood) or liver/gallbladder blockage
·Priapism lasting more than 2–4 hours — permanent damage can happen fast

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Workup

·Complete blood count (CBC) with reticulocyte count
·Hemoglobin electrophoresis or HPLC
·Peripheral blood smear
·Total and direct bilirubin
·Lactate dehydrogenase (LDH)
·Transcranial Doppler (TCD) ultrasound (yearly from age 2 to 16)
·Urine microalbumin and serum creatinine (yearly starting at age 10)
·Chest X-ray (when acute chest symptoms appear)

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Treatment

·Hydroxyurea (daily pill)
·Penicillin VK (daily from 2 months to age 5)
·Vaccinations: PCV13, PPSV23, meningococcal (MenACWY and MenB), Hib, yearly flu, COVID-19
·Annual transcranial Doppler (TCD) ultrasound and chronic transfusions if high-risk
·Folic acid 1 mg daily
·Pain crisis management: IV fluids, oxygen if saturations drop below 95 percent, opioids for severe pain
·Hematopoietic stem cell transplant (bone marrow transplant) or gene therapy

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NCLEX trap

·Chest pain plus fever in sickle cell disease is acute chest syndrome until you prove otherwise. Sickled hemoglobin (HbS) clumps inside lung blood vessels and starves the tissue of oxygen. You must get a chest X-ray, blood gas, and oxygen level right away. Antibiotics help fight infection, but oxygen and blood transfusion are the real lifesavers — they dilute the sickled cells and restore blood flow.
·Pain crises in sickle cell disease are real tissue damage and death from blocked blood vessels. Patients need strong opioids, IV fluids, oxygen, and a written pain plan that the whole team follows. Treat the pain first and fast, then hunt for what triggered the crisis (infection, dehydration, cold, stress). Under-treating pain is cruel and dangerous.
·Sickle cell disease happens in people of African, Mediterranean (Greek, Italian, Turkish), Middle Eastern, and South Asian (Indian) descent. The United States screens all newborns regardless of race (CDC and AAP guideline). The sickle gene does not care what color your skin is — it follows ancestry and geography.
·In sickle cell disease, red blood cells break apart fast (hemolytic anemia) and dump hemoglobin. The liver breaks down the old hemoglobin into bilirubin, which turns the skin and eyes yellow. The liver is not failing — it is working overtime cleaning up the mess. Check liver function tests to be sure, but yellowing of the skin and eyes (jaundice) is expected in sickle cell disease.
·Fever in sickle cell disease can mean sepsis (especially from encapsulated bacteria like Streptococcus pneumoniae), but it can also mean a pain crisis or acute chest syndrome that is triggering the fever. Get blood cultures, a chest X-ray, and an oxygen level. Start antibiotics right away (ceftriaxone covers encapsulated bugs), but also give IV fluids, oxygen, and pain control. The fever is a red flag, not the whole diagnosis.
·Hydroxyurea in sickle cell disease boosts fetal hemoglobin (HbF), which does not sickle. It cuts pain crises by half and prevents stroke and acute chest syndrome (NHLBI guideline). The benefits far outweigh the small risks. Use it in all children and teens with moderate or severe disease (frequent crises, acute chest syndrome, or high stroke risk on transcranial Doppler ultrasound).

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