Practice Quiz

CSC Cardiac Nursing Subspecialty

Category - Problems

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What is the mechanism action of heparin?
  1. Directly inhibits thrombin formation
  2. Inhibits the conversion of prothrombin to thrombin
  3. Dissolves the formed fibrin
  4. Block factor Xa
Explanation
Answer: B - Heparin is a protein that inhibits the conversion of prothrombin to thrombin, which prevents fibrinogen being converted to fibrin. Lepirudin directly inhibits thrombin formation, while low molecular weight heparins block factors Xa and IIa, which inhibit thrombus and clot formation.
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