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Anemia of Chronic Disease

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In one line

·Chronic inflammation raises hepcidin (a liver hormone that locks iron inside storage cells) so the bone marrow cannot reach that iron to build red blood cells, even though total body iron is normal or high.

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Normal physiology

·Normally, iron moves in a controlled cycle. Old red blood cells break down in the spleen (an organ that filters blood) and release iron. The gut absorbs iron from food. Transferrin (a blood protein) carries iron to bone marrow. Bone marrow uses iron plus erythropoietin (a kidney hormone) to make new red blood cells every day. Hepcidin (a liver hormone) fine-tunes this cycle by blocking iron release from storage cells and gut cells when the body senses enough iron or when infection is present. In health, hepcidin stays low enough that iron flows freely to meet the bone marrow's daily demand of roughly 20 to 25 milligrams of iron to replace the 1 percent of red cells that die each day.

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What goes wrong

·Chronic inflammation—from diseases like rheumatoid arthritis, cancer, chronic kidney disease, or long-lasting infection—triggers immune messenger proteins (cytokines, especially IL-6) that tell the liver to make excess hepcidin. High hepcidin blocks iron from leaving storage cells and gut cells, so serum iron drops even though total body iron is normal or high. At the same time, inflammation and kidney disease lower erythropoietin (the hormone that drives red blood cell production). The result is a double hit: the bone marrow gets less iron and less growth signal, so red blood cell production falls and anemia develops slowly over weeks to months.

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Hallmark signs

·Fatigue and tiring quickly during activities that used to feel easy (like climbing stairs or walking a few blocks)
·Pale skin, pale inside the eyelids, or pale nail beds
·Shortness of breath when you move around or exercise
·Fast heartbeat (your heart pounds or races, especially when you are active)
·Feeling dizzy or lightheaded, especially when you stand up quickly
·Headache (usually a dull, steady ache)
·Cold hands and feet
·Your underlying disease feels worse (for example, more joint pain if you have rheumatoid arthritis, or more trouble breathing if you have kidney disease)

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Red flags · escalate now

·Hemoglobin below 7–8 g/dL, or a drop of more than 2 g/dL in one week (suggests sudden bleeding inside the body or red cells breaking apart on top of the chronic anemia)
·New chest pain, severe shortness of breath while resting, or fainting in a person with anemia who also has heart disease (sign the heart is not getting enough oxygen and may be failing)
·Fever, losing weight without trying, drenching night sweats, or swollen lymph nodes along with anemia (raises worry for cancer, tuberculosis, or HIV hiding underneath)
·Hemoglobin keeps falling even after treating the main disease, or does not improve with erythropoietin shots and iron pills (suggests hidden bleeding, red cells being destroyed, or bone marrow taken over by cancer or damaged by medicine)
·Signs of too much iron in the body—ferritin above 1,000 ng/mL, liver swelling, or skin turning bronze—in someone getting many blood transfusions (iron overload can poison the liver, heart, and pancreas)

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Workup

·Complete blood count (CBC) with red cell indices (MCV, MCH, MCHC) and reticulocyte count
·Iron studies panel: serum iron, total iron-binding capacity (TIBC), serum ferritin, and transferrin saturation
·C-reactive protein (CRP) and red blood cell (erythrocyte) sedimentation rate (ESR)
·Serum creatinine and estimated glomerular filtration rate (eGFR)
·Peripheral blood smear reviewed under a microscope
·Serum vitamin B12 and folate levels
·Soluble transferrin receptor (sTfR) and sTfR/log ferritin ratio (if iron studies are unclear)

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Treatment

·Treat the underlying chronic disease with disease-specific therapy: disease-modifying antirheumatic drugs (methotrexate, TNF inhibitors) for rheumatoid arthritis, antibiotics for chronic infections, aminosalicylates or biologics (infliximab, adalimumab) for inflammatory bowel disease, chemotherapy or immunotherapy for cancer
·Give iron supplementation—oral ferrous sulfate 325 milligrams once daily, or intravenous iron (iron sucrose 200 milligrams, ferric carboxymaltose 750 to 1000 milligrams)—if transferrin saturation is below 20 percent and ferritin is below 100 nanograms per milliliter, suggesting coexisting iron deficiency
·Give erythropoiesis-stimulating agents (ESAs: epoetin alfa 50 to 100 units per kilogram subcutaneously three times weekly, or darbepoetin alfa 0.45 micrograms per kilogram once weekly) for anemia in chronic kidney disease (eGFR below 60) or chemotherapy-induced anemia, targeting hemoglobin 10 to 11.5 grams per deciliter per KDIGO and ASCO/ASH guidelines
·Give packed red blood cell transfusion (1 unit raises hemoglobin by about 1 gram per deciliter) for severe symptomatic anemia—hemoglobin below 7 grams per deciliter with chest pain, fainting, shortness of breath at rest, confusion, or active bleeding—per AABB restrictive transfusion guidelines
·Monitor complete blood count with reticulocyte count, serum ferritin, transferrin saturation, and inflammatory markers (CRP or ESR) every 4 to 8 weeks during treatment

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NCLEX trap

·Low serum iron in anemia of chronic disease means iron is trapped inside cells by hepcidin (a protein made during inflammation that locks iron away), not that the patient needs more iron. Check transferrin saturation (the percentage of transferrin carrying iron) first. If transferrin saturation is below 20% AND ferritin (the body's iron storage protein) is low, then true iron deficiency is also present. If ferritin is normal or high, iron supplements will not help and may increase infection risk because bacteria need iron to grow.
·In anemia of chronic disease, hepcidin and low erythropoietin (the kidney hormone that tells bone marrow to make red blood cells) prevent the bone marrow from responding normally. Reticulocytes stay blunted (low or inappropriately normal for the degree of anemia), not high. A high reticulocyte count means the marrow is responding well—think iron deficiency anemia or active bleeding instead.
·Anemia of chronic disease is a signal that the real problem (rheumatoid arthritis, inflammatory bowel disease, cancer, chronic infection) is not controlled. Treat the underlying disease first. If you only treat the anemia, you miss the opportunity to fix the root cause and the anemia will return.
·Ferritin is also an acute-phase reactant (a protein that rises during inflammation) in addition to being an iron storage marker. In anemia of chronic disease, ferritin can be elevated from inflammation even when iron is trapped inside cells and true iron deficiency is also happening. Always check transferrin saturation and serum iron together with ferritin to see the full picture.
·ESAs carry risks including blood clots (thromboembolic events) and high blood pressure (hypertension). Current guidelines (FDA, KDIGO, ASCO/ASH) say to use them only for symptomatic anemia that limits daily function or for anemia from chemotherapy or chronic kidney disease when hemoglobin is below guideline thresholds. Mild anemia of chronic disease often improves when you treat the underlying inflammatory disease effectively.
·Mild anemia of chronic disease is a warning sign that systemic inflammation is high and the underlying disease is not well controlled. It tells you the disease needs more aggressive treatment with disease-modifying agents or biologics. Do not ignore it—use it as a clinical marker of disease activity.

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