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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: • Genetic Mutation: Caused by a mutation in the HBB gene that encodes for hemoglobin. • Inheritance Pattern: It follows an autosomal recessive pattern: • A person must inherit two defective genes (one from each parent) to develop the disease. • 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: • Chronic Anemia: The body struggles to produce enough red blood cells to replace those lost through hemolysis, leading to fatigue, weakness, and pallor. • Pain Crises: Severe pain, often referred to as a vaso-occlusive crisis, occurs when sickled cells block blood flow to organs or tissues. It ...