chapter 49. quiz 8. Hemolytic and non hemolytic Transfusion Reaction
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Questions and Answers

What is the main cause of acute hemolytic transfusion reactions?

  • Recipient antibody attacking transfused donor cells (correct)
  • Complement attacking transfused cells
  • Extravascular RBC destruction
  • Intravascular RBC destruction

Why are hemolytic transfusion reactions involving extravascular RBC destruction generally less serious?

  • Complement is not involved in these reactions
  • Destruction primarily occurs in the reticuloendothelial system (correct)
  • These reactions occur due to ABO incompatibility
  • Recipient antibodies immediately hemolyze transfused RBCs

What is the incidence of an acute hemolytic transfusion reaction resulting from ABO incompatibility in 2011?

  • 1:1200 to 1:190,000. (correct)
  • 1:200,000
  • 1:45,000
  • 1:19,000

What is crucial to prevent during hemolytic transfusion reactions?

<p>Renal failure and DIC (A)</p> Signup and view all the answers

How do fatal reactions occurring in blood recipients or donors need to be reported according to FDA requirements?

<p>Within 24 hours by telephone or within 7 days in writing (D)</p> Signup and view all the answers

What was the primary cause of deaths from acute hemolytic reactions between 1976 and 1985?

<p>Errors involving ABO incompatibility (B)</p> Signup and view all the answers

What is the classic presenting sign of a hemolytic transfusion reaction under general anesthesia?

<p>Hemoglobinuria (A)</p> Signup and view all the answers

At what level of plasma hemoglobin (Hb) concentration does hemoglobinuria occur?

<p>150 mg/dL (D)</p> Signup and view all the answers

What protein binds free hemoglobin in the plasma?

<p>Haptoglobin (A)</p> Signup and view all the answers

What laboratory test can confirm the presence of a hemolytic transfusion reaction?

<p>Direct antiglobulin test (C)</p> Signup and view all the answers

What may be the only clue of a hemolytic transfusion reaction under general anesthesia?

<p>Hemoglobinuria (A)</p> Signup and view all the answers

Which substance is released due to complement activation during a hemolytic transfusion reaction?

<p>Vasoactive amines (B)</p> Signup and view all the answers

what is the most common sign and Symptoms of Hemolytic Transfusion Reactions

<p>Fever (A)</p> Signup and view all the answers

What is the likely cause of acute renal failure from intravascular hemolysis?

<p>Precipitation of hemoglobin in the form of acid hematin in the proximal tubule (A)</p> Signup and view all the answers

What is one approach to therapy for intravascular hemolysis to prevent acute renal failure?

<p>Use of diuretics to increase urine flow (C)</p> Signup and view all the answers

Why is alkalization of urine recommended in the treatment for intravascular hemolysis?

<p>To prevent precipitation of acid hematin in the distal tubules (B)</p> Signup and view all the answers

Why does Disseminated Intravascular Coagulation (DIC) commonly occur with hemolytic transfusion reactions?

<p>Activation of the intrinsic system of coagulation by released erythrocytin (C)</p> Signup and view all the answers

What is the recommended approach if initial mannitol administration is ineffective in treating intravascular hemolysis?

<p>Use more potent diuretics like furosemide (C)</p> Signup and view all the answers

What is a possible consequence of intravascular hemolysis on the renal system?

<p>Mechanical blockage due to precipitation of Hb in the distal tubule (D)</p> Signup and view all the answers

What laboratory values should be obtained as soon as a hemolytic transfusion reaction is recognized?

<p>Platelet count, PT, and PTT (D)</p> Signup and view all the answers

What may cause hypotension during a hemolytic transfusion reaction?

<p>Activation of the kallikrein system (A)</p> Signup and view all the answers

What is the purpose of obtaining baseline platelet count, PT, and PTT values during a hemolytic transfusion reaction?

<p>To monitor coagulation status (B)</p> Signup and view all the answers

In a hemolytic transfusion reaction, why is it important to have baseline laboratory values for comparison?

<p>To compare with subsequent test results (A)</p> Signup and view all the answers

What is the main reason for the delayed hemolytic transfusion reactions in recipients sensitized to RBC antigens?

<p>Presence of alloantibodies after a secondary stimulus (C)</p> Signup and view all the answers

Which system commonly involves antibodies in delayed hemolytic transfusion reactions?

<p>Rh system (B)</p> Signup and view all the answers

What is the typical manifestation of delayed hemolytic transfusion reactions?

<p>Jaundice and hemoglobinuria (A)</p> Signup and view all the answers

Why are delayed hemolytic transfusion reactions more common in females with a known disposition for alloimmunization?

<p>Previous blood transfusions or pregnancy (C)</p> Signup and view all the answers

How do delayed hemolytic transfusion reactions differ from immediate reactions regarding antibody concentration?

<p>Antibody concentration is not detectable at the time of transfusion (D)</p> Signup and view all the answers

What is the primary cause of RBC destruction in delayed hemolytic transfusion reactions?

<p>Elevated levels of alloantibodies after a secondary stimulus (D)</p> Signup and view all the answers

What should the surgical team consider in a patient who experiences an unexplained decrease in Hb 2 to 21 days after a transfusion?

<p>Delayed hemolytic transfusion reaction (B)</p> Signup and view all the answers

Why are delayed hemolytic transfusion reactions harder to prevent compared to immediate reactions?

<p>Pretransfusion testing cannot detect very low levels of antibodies (D)</p> Signup and view all the answers

What is a critical differential diagnosis that the surgical team should include for patients with a decrease in Hb after a transfusion?

<p>Delayed hemolytic transfusion reaction (A)</p> Signup and view all the answers

Why might a decrease in Hb following a transfusion in a postoperative patient lead to a return to the operative room?

<p>Attributed to postoperative bleeding (A)</p> Signup and view all the answers

What is a significant challenge in preventing delayed hemolytic transfusion reactions according to the text?

<p>Inability of pretransfusion testing to detect low levels of antibodies (C)</p> Signup and view all the answers

What is the most common cause of transfusion-related mortality reported to the FDA from 2012 to 2016?

<p>Transfusion-Related Acute Lung Injury (TRALI) (D)</p> Signup and view all the answers

What symptom of TRALI usually appears within 6 hours after a blood transfusion?

<p>Fluid in the endotracheal tube (A)</p> Signup and view all the answers

Why is TRALI considered to occur in the absence of excessive intravascular volume and cardiac failure?

<p>Manifestation as noncardiogenic pulmonary edema (C)</p> Signup and view all the answers

What is the definitive therapy recommended for treating TRALI during a blood transfusion?

<p>Stopping the transfusion and providing supportive measures (C)</p> Signup and view all the answers

Which component of blood is particularly implicated as an inciting factor for TRALI?

<p>Fresh Frozen Plasma (FFP) (D)</p> Signup and view all the answers

the incidence of TRALI is

<p>1.3% to 3% (C)</p> Signup and view all the answers

despite TRALI remains the leading cause of transfusion-related death. most patients recover within

<p>96 hours (C)</p> Signup and view all the answers

Identified risk factors include all the following except?

<p>Negative fluid-balance (D)</p> Signup and view all the answers

what is the most common risk factor for TRALI?

<p>plasma from female donors (A)</p> Signup and view all the answers

What clinical finding can help differentiate between TRALI and TACO?

<p>Elevated B-type natriuretic peptide/protein (C)</p> Signup and view all the answers

What is a possible reason for the declining incidence rate of TACO according to the text?

<p>More restrictive transfusion practice (A)</p> Signup and view all the answers

Besides volume transfused, what other factor is mentioned as a risk factor for TACO?

<p>Intraoperative fluid balance (B)</p> Signup and view all the answers

How have leukoreduction techniques been suggested to impact the incidence rate of TACO?

<p>Reduce the incidence rate (C)</p> Signup and view all the answers

What supportive measure is recommended in both TRALI and TACO cases according to the text?

<p>Lung protective ventilation measures (B)</p> Signup and view all the answers

What treatment is recommended to relieve the symptoms of an allergic reaction during a blood transfusion?

<p>Antihistamines (A)</p> Signup and view all the answers

Which symptom characterizes the more severe allergic reaction involving anaphylaxis during a blood transfusion?

<p>Dyspnea (D)</p> Signup and view all the answers

What type of blood should be given to patients who have experienced anaphylactic reactions due to IgA deficiency?

<p>Washed RBCs or IgA-deficient blood (A)</p> Signup and view all the answers

What is the cause of anaphylactic reactions in patients during a blood transfusion?

<p>Transfusion of IgA (B)</p> Signup and view all the answers

How do anaphylactic reactions differ from other allergic reactions during a blood transfusion?

<p>Involve rapid onset and severe symptoms (A)</p> Signup and view all the answers

What is the primary cause of febrile nonhemolytic reactions to blood transfusions?

<p>Release of pyrogenic cytokines and intracellular contents by donor leukocytes (C)</p> Signup and view all the answers

How can a hemolytic reaction be differentiated from a febrile reaction?

<p>Positive direct antiglobulin test (C)</p> Signup and view all the answers

What is the role of leukoreduced blood in reducing adverse reactions to transfusions?

<p>Lowers the incidence of febrile reactions (B)</p> Signup and view all the answers

What symptom is not typically associated with a febrile nonhemolytic reaction to a blood transfusion?

<p>Hematuria (A)</p> Signup and view all the answers

What type of allergic reaction to a blood transfusion is not mediated by IgE?

<p>Anaphylactoid (A)</p> Signup and view all the answers

Which test can definitively confirm the presence of a hemolytic transfusion reaction?

<p>Direct antiglobulin test (D)</p> Signup and view all the answers

which type of allergic reaction to a blood transfusion is the most common ?

<p>minor Allergic reactions (A)</p> Signup and view all the answers

what is the main cause for Most allergic transfusion reactions

<p>foreign protein (D)</p> Signup and view all the answers

what is The most common symptom in allergic transfusion reactions ?

<p>urticaria with itching (A)</p> Signup and view all the answers

patient arriving to operation room, planned for liver resection, surgeon informing you that this patient has a high risk for bleeding intraoperative due to surgical factors, and also informing you that he had allergic reaction for blood transfusion few years ago. what s your next step?

<p>order washed RBCs from blood bank (C)</p> Signup and view all the answers

What is the primary mechanism by which transfusion-associated graft-versus-host disease (GVHD) is initiated?

<p>Engraftment of donor lymphocytes (B)</p> Signup and view all the answers

who is considered at risk for GVHD?

<p>Severely immunocompromised patients (D)</p> Signup and view all the answers

How can transfusion-associated GVHD be prevented?

<p>By irradiating the blood products before transfusion (B)</p> Signup and view all the answers

Which symptom is commonly associated with transfusion-associated GVHD?

<p>Leukopenia (A)</p> Signup and view all the answers

In what situation might transfusion-associated GVHD still occur despite leukocyte filtering?

<p>When irradiation is not performed (C)</p> Signup and view all the answers

why patients receiving directed donations from first or second-degree relatives are at risk for Transfusion-associated graft-versus-host disease (GVHD) ?

<p>because transfused lymphocytes with shared HLA haplotypes cannot be recognized and eliminated (B)</p> Signup and view all the answers

What is the main complication associated with iron overload resulting from chronic transfusion therapy?

<p>Liver or heart dysfunction (A)</p> Signup and view all the answers

What is the term for the condition in which recipient alloantibodies attack donor platelet antigens post-transfusion?

<p>Posttransfusion purpura (C)</p> Signup and view all the answers

Which complication may arise due to HLA alloimmunization resulting in antibodies directed against HLA class I antigens?

<p>platelet counts become refractory (C)</p> Signup and view all the answers

What is the outcome for patients with microchimerism where donor lymphocytes persist in the patient?

<p>Unknown (D)</p> Signup and view all the answers

Which type of transfusion reaction involves activation of the coagulation pathway leading to bradykinin production and allergic reactions?

<p>Hypotensive transfusion reaction (A)</p> Signup and view all the answers

What is the risk associated with HPA alloimmunization leading to platelet refractoriness from antibodies against platelet antigens?

<p>platelet refractoriness (A)</p> Signup and view all the answers

what is the percentage of recipients who are chronically transfused develop RBC alloantibodies ?

<p>2% to 8% (A)</p> Signup and view all the answers

How can universal leukoreduction help reduce the risk of platelet transfusion refractoriness?

<p>By reducing the risk of HLA alloimmunization from blood transfusions (B)</p> Signup and view all the answers

What is one of the benefits that universal leukoreduction might provide according to the text?

<p>Decreasing postoperative mortality (D)</p> Signup and view all the answers

In the debate on universal leukoreduction, which approach has been used to justify its implementation?

<p>'May help, won't hurt' approach (D)</p> Signup and view all the answers

How can leukoreduction potentially reduce the transmission of variant Creutzfeldt-Jakob disease?

<p>By removing white blood cells from blood transfusions (B)</p> Signup and view all the answers

Which type of blood products need to be irradiated to prevent transfusion-associated GVHD?

<p>RBCs, platelets, and granulocytes (B)</p> Signup and view all the answers

Who is particularly recommended to receive irradiated blood products to prevent GVHD?

<p>Infants younger than 4 months (B)</p> Signup and view all the answers

For which patients undergoing extracorporeal membrane oxygenation is irradiation of blood products recommended?

<p>Children younger than 1 year old (D)</p> Signup and view all the answers

What is a common indication for irradiation of blood products other than in infants and critically ill children?

<p>Recipients of cellular components known to be from a blood relative (B)</p> Signup and view all the answers

Which recipients are NOT required to have their blood products irradiated to prevent GVHD?

<p>Patients receiving routine chemotherapy for solid tumors (D)</p> Signup and view all the answers

When is irradiation of blood products not necessary according to the text?

<p>For patients on immunosuppressive therapy post organ transplant (B)</p> Signup and view all the answers

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