What is the primary purpose of blood typing before a transfusion?
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Principles of blood typing, cross-matching, transfusion reactions, and management of transfusion-related issues.
Mastering this deck will enable healthcare professionals to accurately perform blood compatibility testing, recognize and manage transfusion reactions, and ensure safe transfusions, thereby reducing morbidity and improving patient outcomes.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary purpose of blood typing before a transfusion? | To determine the blood group (A, B, AB, O) and Rh status of the donor and recipient, ensuring compatibility and preventing transfusion reactions. | Think of blood typing as matching 'keys' to 'locks' to prevent mismatches. |
| 2 | Which blood group is considered the universal donor for red blood cells? | Blood group O negative, as it lacks A, B, and Rh antigens, minimizing the risk of alloimmunization. | O negative is the 'universal' because it can go to anyone, like a 'blank slate'. |
| 3 | What is cross-matching in blood transfusion? | A laboratory test where donor red blood cells are mixed with the recipient's serum to check for agglutination or hemolysis, confirming compatibility. | Think of it as a 'test run' to ensure the blood will not react adversely. |
| 4 | Name one immediate life-threatening transfusion reaction caused by incompatible blood. | Hemolytic transfusion reaction, characterized by rapid destruction of transfused red blood cells leading to hemoglobinemia and hemoglobinuria. | Remember: incompatible transfusions cause 'hemolysis'—the destruction of red cells. |
| 5 | What antibody is responsible for hemolytic transfusion reactions in ABO-incompatible transfusions? | IgM antibodies against A or B antigens, which activate complement and cause rapid hemolysis. | IgM is efficient at activating complement, leading to cell lysis. |
| 6 | Which type of transfusion reaction is characterized by fever, chills, and allergic symptoms? | Febrile non-hemolytic transfusion reaction, usually due to cytokines or recipient antibodies reacting to donor leukocytes or plasma proteins. | Think of it as a 'feverish allergy' to transfused blood components. |
| 7 | How is a transfusion reaction managed acutely? | Immediate cessation of transfusion, maintenance of IV access with saline, monitoring vital signs, and supportive care; administering antihistamines or corticosteroids if allergic reactions occur. | Stop, support, and investigate—quick action can prevent serious complications. |
| 8 | Which blood component is most commonly implicated in transfusion-related acute lung injury (TRALI)? | Plasma-containing components, especially from donors with anti-HLA or anti-HNA antibodies. | TRALI is linked to donor plasma with antibodies that react with recipient leukocytes. |
| 9 | What is the typical cause of iron overload in patients receiving multiple transfusions? | Repeated transfusions introduce excess iron, which accumulates since the body has no active mechanism to excrete large amounts of iron. | Think of transfusions as adding 'iron debt' that the body cannot easily pay off. |
| 10 | What blood test confirms the patient's Rh status? | Rh (D) blood typing, which detects the presence or absence of the D antigen on red blood cells. | D antigen detection is key—think 'Rh' as the 'D' marker. |
| 11 | What is the significance of direct antiglobulin test (DAT) in transfusion medicine? | DAT detects antibodies or complement attached to red blood cells, aiding in diagnosing hemolytic transfusion reactions or autoimmune hemolytic anemia. | It's like a 'clot detector' for immune attack on red cells. |
| 12 | In what scenario is autologous blood transfusion preferred? | When the patient donates their own blood prior to elective surgery, reducing risk of alloimmunization and transfusion reactions. | Autologous means 'self'—your own blood for your own benefit. |
| 13 | What are leukoreduced blood products and their benefit? | Blood products with most leukocytes removed to reduce febrile reactions, alloimmunization, and transmission of leukocyte-borne viruses. | Leukoreduction is like 'filtering out' white cells to improve safety. |
| 14 | Name a common transfusion-related complication in neonates. | Intraventricular hemorrhage due to rapid correction of anemia or volume overload, or alloimmunization leading to hemolytic disease of the newborn. | Neonates are sensitive; careful transfusion is essential. |
| 15 | What is the purpose of using crossmatch-compatible units in transfusion? | To ensure that the donor blood will not react with the recipient's serum, minimizing the risk of hemolytic reactions. | Crossmatch acts as a 'compatibility test' before the actual transfusion. |
| 16 | Which pathogen transmission risk is reduced by leukoreduction and irradiation of blood products? | Transmission of cytomegalovirus (CMV) and graft-versus-host disease (GVHD). | Irradiation and leukoreduction help 'shield' vulnerable recipients. |
| 17 | What is the role of Rh immunoglobulin (RhIg) in transfusion medicine? | To prevent alloimmunization against the D antigen in Rh-negative pregnant women during and after pregnancy, reducing hemolytic disease of the fetus and newborn. | RhIg is like a 'protective shield' for at-risk pregnancies. |
| 18 | How can transfusion-related graft-versus-host disease (GVHD) be prevented? | By irradiating blood products to inactivate donor lymphocytes, preventing their proliferation and immune attack on the recipient. | Irradiation 'freezes' lymphocytes, stopping GVHD. |
| 19 | What is a delayed hemolytic transfusion reaction? | A reaction occurring days to weeks after transfusion due to recipient alloantibodies against donor red cell antigens, leading to hemolysis. | Delayed reactions are subtle but can cause hemolysis over time. |
| 20 | Which blood group antigens are most immunogenic and relevant for transfusion compatibility? | ABO and Rh (D) antigens, due to their high immunogenicity and clinical significance. | Think 'ABO and Rh' as the 'big players' in blood compatibility. |
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