What is the primary genetic mutation responsible for sickle cell disease?
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Genetic disorders affecting hemoglobin structure and production, including clinical presentation, diagnosis, and management.
This deck provides a comprehensive understanding of sickle cell disease and thalassemias, enabling clinicians to recognize, diagnose, and manage these conditions effectively, improving patient outcomes through informed decision-making.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary genetic mutation responsible for sickle cell disease? | A point mutation in the beta-globin gene (HBB) resulting in the substitution of valine for glutamic acid at the sixth amino acid position, leading to hemoglobin S formation. | Think 'V' for Valine replacing Glutamic acid. |
| 2 | Describe the pathophysiology of sickle cell crises. | Sickled hemoglobin causes red blood cells to become rigid and sickle-shaped, leading to vaso-occlusion, ischemia, and hemolytic anemia, especially triggered by hypoxia, dehydration, or infection. | Remember 'SICK' - Sickling, Ischemia, Clumping, Kidneys. |
| 3 | What are common clinical features of sickle cell disease in children? | Episodes of acute pain (vaso-occlusive crises), anemia, jaundice, splenomegaly early in life, susceptibility to infections, especially pneumococcal infections. | Think 'Pain, Anemia, Infection' as key features. |
| 4 | Which laboratory test confirms the diagnosis of sickle cell disease? | Hemoglobin electrophoresis revealing predominantly hemoglobin S; also, peripheral blood smear shows sickled cells during crises. | Electrophoresis is the diagnostic gold standard. |
| 5 | What is the main goal of management in sickle cell disease? | Prevent complications, reduce sickling episodes, and manage anemia—includes hydroxyurea therapy, pain control, and infection prevention. | Think 'PREVENT'—Pain, Risks, Events, Nucleic acids, Therapy. |
| 6 | Name a disease caused by deficiency of alpha-globin chains. | Alpha-thalassemia, which results from deletions or mutations in the alpha-globin gene clusters. | Alpha-globin = 'A' for Alpha-thalassemia. |
| 7 | What is the characteristic blood smear finding in alpha-thalassemia minor? | Microcytic hypochromic anemia with target cells and mild anisopoikilocytosis. | Target cells are a hallmark in thalassemia. |
| 8 | How can beta-thalassemia major present clinically in early childhood? | Severe anemia presenting within the first year of life, pallor, failure to thrive, hepatosplenomegaly, and skeletal deformities due to marrow expansion. | Think 'B' for both Beta-thalassemia and 'Big' anemia. |
| 9 | Which diagnostic test distinguishes beta-thalassemia major from other microcytic anemias? | Hemoglobin electrophoresis showing elevated HbF and HbA2 levels in beta-thalassemia major. | Elevated HbA2 is characteristic of beta-thalassemia. |
| 10 | What is the main difference between sickle cell disease and sickle cell trait? | Sickle cell disease involves homozygous HbS (HbSS) with clinical symptoms; sickle cell trait is heterozygous (HbAS) and usually asymptomatic, with less sickling tendency. | Think 'Disease' vs 'Carrier'. |
| 11 | Which complication is common in untreated sickle cell disease due to recurrent vaso-occlusion? | Splenic infarction leading to functional asplenia and increased susceptibility to encapsulated bacteria. | Spleen infarcts early in life are characteristic. |
| 12 | What is the role of hydroxyurea in sickle cell disease management? | Hydroxyurea increases fetal hemoglobin (HbF) production, reducing sickling and frequency of crises. | Think 'Hydro' for 'Help'—increasing HbF to help sickled cells. |
| 13 | Name the feature seen on peripheral blood smear during sickle cell crises. | Presence of sickled erythrocytes, Howell-Jolly bodies, and sometimes target cells. | Sickled cells are pathognomonic. |
| 14 | What is the primary preventive measure for infections in sickle cell patients? | Regular penicillin prophylaxis and immunizations against pneumococcus, Haemophilus influenzae, and meningococcus. | Prevention 'P' for Penicillin and Prevention. |
| 15 | Which population group is most commonly affected by sickle cell disease? | Individuals of African, Mediterranean, Middle Eastern, and Indian ancestry. | Think 'A' for Africa and Ancestry. |
| 16 | What is the main pathophysiological reason for anemia in thalassemia? | Impaired globin chain synthesis leads to ineffective erythropoiesis and hemolysis. | Impaired synthesis = ineffective production. |
| 17 | Which hemoglobin types are elevated in beta-thalassemia major? | Hemoglobin F (HbF) and Hemoglobin A2 (HbA2). | F and A2 are elevated in beta-thalassemia. |
| 18 | What are common complications of untreated beta-thalassemia major? | Severe anemia, growth retardation, osteoporosis, extramedullary hematopoiesis, and iron overload from transfusions. | Think 'IRON' overload and growth issues. |
| 19 | How is thalassemia diagnosed definitively? | Hemoglobin electrophoresis showing abnormal hemoglobin patterns, increased HbF and HbA2 for beta-thalassemia. | Electrophoresis reveals the abnormal hemoglobin. |
| 20 | What is the significance of the Heinz bodies seen in hemolytic anemias? | They indicate oxidative damage to hemoglobin, often seen in G6PD deficiency, which can be precipitated by certain drugs or foods. | Heinz bodies = oxidative stress. |
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