The nurse is administering the angiotensin II receptor antagonist valsartan. Which physiological response causes its therapeutic effect?
Chronotropic effect.
Diuresis
Vasodilation.
Sympatholytic action.
The Correct Answer is C
A) Chronotropic effect: This term refers to changes in heart rate. Angiotensin II receptor antagonists like valsartan primarily affect blood pressure and vascular tone, rather than directly altering heart rate.
B) Diuresis: Diuresis involves increased urine production. Although some antihypertensives can have a diuretic effect, valsartan primarily works through mechanisms other than increasing urine output.
C) Vasodilation: Angiotensin II receptor antagonists such as valsartan work by blocking the action of angiotensin II, which leads to vasodilation. This reduction in vascular resistance helps to lower blood pressure and is the primary therapeutic effect of valsartan.
D) Sympatholytic action: This refers to the suppression of sympathetic nervous system activity. Valsartan does not primarily act through sympathetic nervous system modulation but rather through direct vasodilation by blocking angiotensin II receptors.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Obtain a platelet count weekly: Regular monitoring of platelet counts is important for clients on methotrexate due to the risk of bone marrow suppression and potential thrombocytopenia. This instruction is appropriate and necessary.
B. Take the medication during pregnancy: Methotrexate is contraindicated during pregnancy due to its teratogenic effects and potential to cause fetal harm. It is crucial for clients to avoid using methotrexate while pregnant or planning to become pregnant.
C. Use folic acid to protect the liver: While folic acid is often used to help reduce the side effects of methotrexate, particularly its gastrointestinal effects and potential for liver toxicity, it is not used to "protect the liver" per se. The correct approach is to use folic acid as directed by a healthcare provider, often to mitigate some of the side effects of methotrexate.
D. Store the medication at room temperature: Methotrexate should be stored according to the manufacturer's instructions, which usually involve keeping it at room temperature. This information is correct and does not require additional instruction.
Correct Answer is A
Explanation
A. Platelet count of 100,000/mm³ (100 x 10^9/L): Enoxaparin is a low molecular weight heparin used to prevent deep vein thrombosis (DVT), and a low platelet count (thrombocytopenia) can be a serious adverse effect of anticoagulant therapy. A platelet count of 100,000/mm³ is below the normal range (150,000 to 400,000/mm³) and indicates potential thrombocytopenia, which could increase the risk of bleeding and may warrant immediate action.
B. Blood urea nitrogen (BUN) 20 mg/dL (7.1 mmol/L): This BUN level is at the upper limit of normal but does not typically require immediate action unless there are other symptoms or significant changes in kidney function.
C. Serum creatinine 1.0 mg/dL (88.4 μmol/L): This value is within the normal range for serum creatinine and does not indicate an immediate concern related to enoxaparin.
D. Hematocrit 45% (0.45 volume fraction): This hematocrit level is within the normal range and does not typically require immediate action.
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