Examkin

Soru

Zorluk: ZorHematology and Oncology

Match each clinical presentation of a patient experiencing an adverse event during or shortly after a packed red blood cell (pRBC) transfusion to the most likely underlying pathophysiologic mechanism.

  • A 68-year-old man with a history of ischemic cardiomyopathy develops progressive dyspnea, a blood pressure of 185/105 mm Hg, and a prominent S3 gallop two hours into receiving a pRBC transfusion.Rapid intravascular volume expansion overwhelming cardiopulmonary compensatory mechanisms.
  • A 52-year-old woman undergoing an exploratory laparotomy develops sudden diffuse oozing from the surgical field, dark urine, and a blood pressure drop to 70/40 mm Hg 10 minutes after initiation of a pRBC transfusion.Preformed recipient IgM antibodies rapidly reacting with donor red blood cell antigens, leading to massive intravascular complement activation.
  • A 40-year-old man being treated for a severe gastrointestinal hemorrhage develops acute severe hypoxemia, new bilateral pulmonary infiltrates, and a blood pressure of 85/50 mm Hg three hours after receiving a pRBC transfusion.Donor anti-human leukocyte antigen (HLA) or anti-neutrophil antibodies activating recipient neutrophils within the pulmonary microvasculature.
  • A 35-year-old man with acute myeloid leukemia develops a new-onset temperature of 39.2°C (102.6°F) and rigors 45 minutes into a pRBC transfusion, while maintaining normal blood pressure and oxygen saturation.Recipient antibodies reacting against accumulated donor leukocytes and cytokines released during blood product storage.

Cevap

The correct pairings successfully match TACO to volume expansion (left 1 to right 1), AHTR to ABO incompatibility with complement activation (left 2 to right 2), TRALI to donor antibodies activating recipient neutrophils (left 3 to right 3), and FNHTR to cytokine/leukocyte reactions (left 4 to right 4).
Each correct pairing links the distinct constellation of vital signs and physical exam findings to the exact immunologic or hemodynamic mechanism driving the transfusion reaction, correctly distinguishing between the hypertensive presentation of TACO, the hypotensive presentation of TRALI, the coagulopathic presentation of AHTR under anesthesia, and the isolated febrile presentation of FNHTR.

Adım Adım Çözüm

1
Analyze the timeline and specific vital sign changes in each clinical vignette.
Distinguish between immediate, life-threatening reactions (shock, DIC) and delayed or milder reactions (isolated fever, respiratory distress).
Onset time and hemodynamic status are key diagnostic branch points for evaluating transfusion reactions.
2
Differentiate the two primary causes of acute pulmonary edema following a transfusion.
The 68-year-old man presents with hypertension and an S3 gallop, indicating TACO. The 40-year-old man presents with hypotension and no prior cardiac history, indicating TRALI.
TACO is a cardiogenic volume overload state characterized by hypertension, whereas TRALI is an immune-mediated capillary leak state characterized by hypotension.
3
Identify the presentation of severe acute hemolysis in an anesthetized patient.
The 52-year-old woman shows diffuse oozing and dark urine (hemoglobinuria), indicative of DIC and intravascular hemolysis characteristic of AHTR.
Anesthesia masks typical symptoms like flank pain and fever, making coagulopathy and shock the predominant presenting signs of ABO incompatibility in the operating room.
4
Isolate the uncomplicated febrile presentation.
The 35-year-old man has a fever and rigors without other systemic compromise, diagnosing FNHTR.
Unlike AHTR or TRALI, FNHTR is a self-limiting reaction driven by cytokines and does not cause hemodynamic collapse or respiratory failure.

Anahtar Kavram

Pathophysiology and clinical presentation of acute blood transfusion reactions.
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Konular

Hematology and Oncology

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