Beta-Thalassemia

Overview


Plain-Language Overview

Beta-Thalassemia is a genetic blood disorder that affects the body's ability to produce enough healthy red blood cells. It primarily involves the blood and bone marrow, where red blood cells are made. People with this condition have a problem with the beta-globin chains of hemoglobin, the protein that carries oxygen in the blood. This leads to anemia, which means the body does not get enough oxygen, causing symptoms like fatigue, weakness, and pale skin. The disorder can range from mild to severe, and in serious cases, it may require regular blood transfusions. It mainly affects people from Mediterranean, Middle Eastern, and Southeast Asian backgrounds. Managing the condition often involves monitoring and treating complications related to low red blood cell counts.

Clinical Definition

Beta-Thalassemia is an inherited hemoglobinopathy characterized by reduced or absent synthesis of the beta-globin chains of hemoglobin due to mutations in the HBB gene. This imbalance causes ineffective erythropoiesis and chronic hemolytic anemia. The severity depends on whether one or both HBB alleles are affected, leading to Beta-Thalassemia minor (trait) or Beta-Thalassemia major (Cooley's anemia). The disease manifests with microcytic hypochromic anemia, extramedullary hematopoiesis, and iron overload from increased absorption and transfusions. Clinical features include hepatosplenomegaly, bone deformities, and growth retardation in severe cases. Diagnosis is important due to its impact on oxygen delivery and potential complications like heart failure and endocrine dysfunction from iron overload.

Clinical Presentation


Diagnostic Workup


Pathophysiology


Treatments


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Outcome & Complications


Differential Diagnoses


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