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?
Activated partial thromboplastin time (APTT)
Bleeding time
Prothrombin time (PT)
Hemoglobin (Hgb)
The Correct Answer is C
warfarin inhibits vitamin K epoxide reductase interfering with the synthesis of vitamin K dependent clotting factors (II, VII, IX, and X). This prolongs the prothrombin time, expressed in the form of INR international normalized ratio. Monitoring of INR helps to ensure that the prescribed dosages are within the therapeutic levels without increasing the risk of bleeding. The target INR range is between 2.5 and 3.5.
A. Used to monitor heparin therapy
B, D- not used for monitoring
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Phenytoin is a lifelong medication for clients presenting with unprovoked seizures. The statement shows that the client has not understood their current management plan or is in denial and requires further counselling to promote adherence.
B.Notifying the doctor before taking any other medication is important as certain drug interactions can lead to toxicity of inadequate blood levels of phenytoin.
C.This is correct as it shows understanding that phenytoin can cause oral adverse effects such as gingival hyperplasia
D.Shows understanding that some drug preparations could have incipient that may cause adverse effects that the originally tolerated agent
Correct Answer is B
Explanation
Soy contains compounds called isoflavones, which inhibit the absorption of levothyroxine in the gastrointestinal tract, leading to decreased blood levels and effectiveness of the medication.
A. Saw palmetto does not interact significantly with levothyroxine.
C. Cranberry does not have significant interactions with levothyroxine.
D. Garlic does not interact significantly with levothyroxine.
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