Bleeding Prevention and Treatment Quiz
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Questions and Answers

Which type of antithrombotic drug attenuates fibrin clot formation by blocking fibrin crosslinking?

  • Fibrinolytic agents
  • Tissue Plasminogen Activator (t-PA)
  • Antiplatelet agents
  • Coagulants (correct)
  • What is the role of Tissue Plasminogen Activator (t-PA) in the fibrinolytic process?

  • It promotes platelet activation
  • It breaks down fibrin clots (correct)
  • It blocks fibrin crosslinking
  • It inhibits platelet aggregation
  • What do antiplatelet agents inhibit?

  • Activation of platelets
  • Aggregation of platelets (correct)
  • Fibrin crosslinking
  • Fibrin clot formation
  • Which class of agents does Tirofiban belong to?

    <p>Fibrinogen inhibitors</p> Signup and view all the answers

    What is the mechanism of action of Vorapaxar?

    <p>Inhibition of protease-activated receptor-1</p> Signup and view all the answers

    Which enzyme metabolizes Vorapaxar?

    <p>CYP3A enzymes</p> Signup and view all the answers

    Which enzyme is responsible for converting plasminogen to plasmin?

    <p>t-PA</p> Signup and view all the answers

    Which thrombolytic agent does not require t-PA for activation?

    <p>Streptokinase</p> Signup and view all the answers

    Which thrombolytic agent has a longer active lifetime in the body compared to Streptokinase?

    <p>Anistreplase</p> Signup and view all the answers

    Which thrombolytic agent has a reduced fibrin binding selectivity due to the removal of the first 172 amino acids?

    <p>Reteplase</p> Signup and view all the answers

    Which enzyme produces thromboxane A2 (TXA2) in platelets?

    <p>Cyclooxygenase</p> Signup and view all the answers

    What is the major product of cyclooxygenase in platelets?

    <p>Thromboxane A2 (TXA2)</p> Signup and view all the answers

    Which receptor responds to thrombin in platelets?

    <p>PAR-1</p> Signup and view all the answers

    What is the action of aspirin on cyclooxygenase1 (COX-1)?

    <p>Irreversible inhibition</p> Signup and view all the answers

    Which of the following drugs increases the amount of active form of protein kinase A (PKA) present in platelets, leading to inhibition of platelet aggregation?

    <p>Dipyridamole</p> Signup and view all the answers

    Which of the following drugs inhibits the activation of myosin light-chain kinase, resulting in vasodilation?

    <p>Dipyridamole</p> Signup and view all the answers

    Which of the following drugs blocks PDE-mediated degradation of cAMP, leading to increased levels of cAMP?

    <p>Cilostazol</p> Signup and view all the answers

    Which of the following drugs irreversibly modifies the platelet ADP receptor, blocking ADP-mediated activation of the GPIIb/IIIa complex and inhibiting platelet aggregation?

    <p>Clopidogrel</p> Signup and view all the answers

    Which enzyme inhibits the action of t-PA by forming a complex with it?

    <p>α2-antiplasmin</p> Signup and view all the answers

    Which of the following thrombolytic agents does not require t-PA for activation?

    <p>Streptokinase</p> Signup and view all the answers

    Which thrombolytic agent has the longest half-life?

    <p>Alteplase</p> Signup and view all the answers

    Which thrombolytic agent has reduced fibrin binding selectivity?

    <p>Reteplase</p> Signup and view all the answers

    Which drug is a cyclic peptide/peptide mimic that is more stable to proteases and peptidases than linear peptides?

    <p>Tirofiban</p> Signup and view all the answers

    Which drug competitively binds to the RGD binding sites in the GPIIb/IIIa complex, inhibiting fibrinogen-GPIIb/IIIa complex interactions and blocking platelet aggregation?

    <p>Tirofiban</p> Signup and view all the answers

    Which drug is an analog of an alkaloid natural product (Himbacine) isolated from the bark of Australian magnolias?

    <p>Vorapaxar</p> Signup and view all the answers

    Which of the following drugs inhibits the activation of myosin light-chain kinase, resulting in vasodilation?

    <p>None of the above</p> Signup and view all the answers

    Which enzyme produces thromboxane A2 (TXA2) in platelets?

    <p>Cyclooxygenase-1 (COX-1)</p> Signup and view all the answers

    What is the major product of cyclooxygenase in platelets?

    <p>Thromboxane A2 (TXA2)</p> Signup and view all the answers

    Which of the following is an irreversible inhibitor of cyclooxygenase-1 (COX-1) and has additional actions that inhibit platelet aggregation and increase vasodilation?

    <p>Triflusal</p> Signup and view all the answers

    Which of the following is NOT a receptor involved in platelet adhesion and aggregation?

    <p>PAR-1</p> Signup and view all the answers

    Which of the following drugs irreversibly inhibits the production of thromboxane A2 (TXA2) in platelets?

    <p>Aspirin</p> Signup and view all the answers

    Which of the following drugs is a bispecific factor IXa- and factor X-directed antibody used to activate the natural coagulation cascade and restore the blood clotting process for those with hemophilia A?

    <p>Emicizumab</p> Signup and view all the answers

    Which of the following drugs inhibits the breakdown of cAMP in platelets and blood?

    <p>Dipyridamole</p> Signup and view all the answers

    Which drug irreversibly modifies the platelet ADP receptor, blocking ADP-mediated activation of the GPIIb/IIIa complex and inhibiting platelet aggregation?

    <p>Clopidogrel</p> Signup and view all the answers

    Which drug is a reversible inhibitor of P2Y12 receptors and binds at a site different from ADP, making it an allosteric antagonist?

    <p>Ticagrelor</p> Signup and view all the answers

    Which drug is the Fab fragment of a monoclonal antibody that binds to the GPIIb/IIIa complex on the platelet surface, inhibiting the GPIIb/IIIa - fibrinogen interaction and blocking platelet aggregation?

    <p>Abciximab</p> Signup and view all the answers

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