In a pediatric patient with severe immune thrombocytopenic purpura (ITP) and a platelet count below 10,000/µL, why are intravenous immunoglobulin (IVIG) and steroids typically given, while platelet transfusions are reserved for life-threatening bleeding?
Group of answer choices
- Platelets are almost immediately destroyed by the autoimmune process.
- Platelet transfusions can worsen the thrombocytopenia.
- IVIG and steroids directly increase platelet production.
- Platelets can induce an allergic reaction.
The correct answer is:
Platelets are almost immediately destroyed by the autoimmune process.
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Explanation:
In immune thrombocytopenic purpura (ITP), the autoimmune destruction of platelets (mediated by antiplatelet antibodies) makes platelet transfusions ineffective unless absolutely necessary for life-threatening bleeding.
Key Treatment Principles:
- IVIG:
- Blocks Fc receptors in the spleen/liver, preventing platelet destruction.
- Provides a rapid but temporary rise in platelet count (within 24–48 hours).
- Steroids (e.g., prednisone):
- Suppress antibody production and reduce splenic clearance of platelets.
- Slower onset but more sustained effect than IVIG.
- Platelet transfusions:
- Not first-line because transfused platelets are quickly destroyed by the same autoimmune process.
- Reserved for severe bleeding (e.g., intracranial hemorrhage).
Why Not the Others?
- “Platelet transfusions worsen thrombocytopenia”: Incorrect—they don’t exacerbate the disease but are ineffective due to rapid destruction.
- “IVIG/steroids directly increase production”: No—they reduce destruction (bone marrow production is usually normal in ITP).
- “Platelets induce allergic reactions”: Rare and unrelated to ITP pathophysiology.
Takeaway:
IVIG + steroids target the autoimmune mechanism, while platelet transfusions are a last resort due to their short-lived benefit.
Thus, the immediate destruction of transfused platelets is the primary reason for avoiding them in stable ITP.
