What is the significance of elevated serum levels of troponin?

This intracellular substance can leak into the blood with cardiac cellular injury or death.

Elevated serum levels of troponin occur because of sustained glycogenolysis.

This substance is elevated when a patient has acute tubular necrosis.

Serum elevation of this acute phase reactant occurs because of tissue injury.

Answer and Explanation

The Correct Answer is A

Choice A rationale
Elevated serum levels of troponin indicate cardiac cellular injury or death. Troponin is a protein released into the bloodstream when heart muscle cells are damaged, such as during a myocardial infarction.
Choice B rationale
Sustained glycogenolysis does not cause elevated troponin levels. Glycogenolysis is the breakdown of glycogen to glucose, primarily occurring in the liver and muscles, not related to troponin release.
Choice C rationale
Acute tubular necrosis does not elevate troponin levels. This condition affects the renal tubules and is typically indicated by elevated creatinine and BUN levels.
Choice D rationale
Troponin is not an acute phase reactant. Acute phase reactants are proteins whose levels change in response to inflammation, such as C-reactive protein (CRP), not troponin.

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Correct Answer is A

Explanation

Choice A rationale
Decreasing coronary artery constriction by giving aspirin is a primary objective in managing unstable angina. Aspirin inhibits platelet aggregation, reducing the risk of clot formation and improving blood flow in the coronary arteries. This helps to alleviate chest pain and prevent myocardial infarction.
Choice B rationale
Increasing afterload for the left ventricle to maximize cardiac output is not a desirable objective in managing unstable angina. Increasing afterload would increase the workload on the heart, which is counterproductive in patients with angina. The goal is to reduce the heart’s workload and improve blood flow.
Choice C rationale
Increasing preload to reduce overall cardiac workload is not a primary objective in managing unstable angina. Increasing preload would increase the volume of blood returning to the heart, potentially worsening symptoms. The focus is on reducing myocardial oxygen demand and improving coronary perfusion.
Choice D rationale
Reducing arterial inflammation by administering statins is a long-term strategy for managing cardiovascular disease, but it is not the immediate objective in managing unstable angina.
Statins help to lower cholesterol levels and reduce inflammation, but the immediate goal in unstable angina is to relieve chest pain and prevent myocardial infarction.

A. Administer sodium polystyrene sulfonate as prescribed. B. Monitor the client’s cardiac rhythm. C. Restrict dietary potassium intake. D. Prepare the client for hemodialysis.

Correct Answer is B

Explanation

Choice A rationale
Administering sodium polystyrene sulfonate helps to lower potassium levels by exchanging sodium ions for potassium ions in the intestines. However, it is not the first intervention because it takes time to work and does not address the immediate risk of cardiac arrhythmias caused by hyperkalemia.
Choice B rationale
Monitoring the client’s cardiac rhythm is the first intervention because hyperkalemia can cause life-threatening cardiac arrhythmias. Continuous cardiac monitoring allows for the early detection and treatment of these arrhythmias, which is crucial for the client’s safety.
Choice C rationale
Restricting dietary potassium intake is an important long-term management strategy for hyperkalemia, especially in clients with chronic kidney disease. However, it does not address the immediate risk of cardiac arrhythmias and is not the first intervention.
Choice D rationale
Preparing the client for hemodialysis is a definitive treatment for hyperkalemia, especially in clients with chronic kidney disease. However, it is not the first intervention because it takes time to arrange and initiate dialysis. Immediate cardiac monitoring is necessary to manage the acute risk of arrhythmias.

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What is the significance of elevated serum levels of troponin?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse caring for a patient with unstable angina will most likely need to give medications to accomplish which desirable objective?

Correct Answer is A

Explanation

A nurse is caring for a client with chronic kidney disease (CKD) who presents with hyperkalemia. Which of the following interventions should the nurse implement first?

Correct Answer is B

Explanation

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