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1. Definition : Sickle Cell Anemia is a genetic blood disorder characterized by the production of abnormal hemoglobin, called hemoglobin S. This causes red blood cells to take on a rigid, sickle-like shape, impairing their ability to carry oxygen and move through blood vessels. 2. Causes: β’ Genetic Mutation: Caused by a mutation in the HBB gene that encodes for hemoglobin. β’ Inheritance Pattern: It follows an autosomal recessive pattern: β’ A person must inherit two defective genes (one from each parent) to develop the disease. β’ If one defective gene is inherited, the person has sickle cell trait, which generally does not cause symptoms but can be passed on to children. 3. Symptoms: β’ Chronic Anemia: The body struggles to produce enough red blood cells to replace those lost through hemolysis, leading to fatigue, weakness, and pallor. β’ Pain Crises: Severe pain, often referred to as a vaso-occlusive crisis, occurs when sickled cells block blood flow to organs or tissues. It ...