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Author Question: A patient's platelet count drops 4 days after being placed on heparin. Select the correct ... (Read 45 times)

scienceeasy

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on: Jun 25, 2018
A patient's platelet count drops 4 days after being placed on heparin. Select the correct interpretation.
 
  a. The patient has heparin-induced thrombocytopenia.
  b. The patient has benign, limited thrombocytopenia related to heparin.
  c. A bleeding time should be performed to evaluate qualitative platelet disorders.
  d. An immunoassay for heparin-dependent anti-platelet factor 4 (PF4) should be performed to distinguish heparin-induced thrombocytopenia from benign, limited thrombocytopenia related to heparin.

Question 2

A platelet aggregation study shows diminished response to all agonists except for a small response to arachidonic acid and full response to ristocetin. Which condition is most likely?
 
  a. Glanzmann thrombasthenia
  b. Aspirin use
  c. VWD
  d. Platelet release defect


Anton

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Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: D
This pattern, a drop in the platelet count 4 days after being placed on heparin, suggests heparin-induced thrombocytopenia. It could also be a benign, limited thrombocytopenia related to heparin. Assays such as the immunoassay for heparin-dependent anti-PF4 can distinguish the two.

Answer to Question 2

ANS: A
Glanzmann thrombasthenia is diagnosed by its diminished secretion and aggregation responses to all agonists except a modest response to arachidonic acid and full, although nondiagnostic, response to ristocetin.


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