ATI RN
ATI N211 Pharmacology Exam I Questions
Extract:
Question 1 of 5
A nurse is caring for a client who is prescribed warfarin therapy for an artificial heart valve. Which of the following laboratory values should the nurse monitor for a therapeutic effect of warfarin?
Correct Answer: B
Rationale: The correct answer is B: Prothrombin time (PT). Warfarin is a medication that works by inhibiting vitamin K-dependent clotting factors, leading to anticoagulation. PT measures the extrinsic pathway of coagulation, which is directly affected by warfarin. By monitoring PT, the nurse can assess the therapeutic effect of warfarin in maintaining the client's blood at the desired level of anticoagulation.
A: Hemoglobin (Hgb) is not directly related to the anticoagulant effect of warfarin.
C: Bleeding time is a measure of platelet function, not affected by warfarin.
D: Activated partial thromboplastin time (aPTT) primarily assesses the intrinsic pathway of coagulation and is not the preferred test for monitoring warfarin therapy.
Question 2 of 5
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Question 3 of 5
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Question 4 of 5
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Question 5 of 5
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