A nurse is caring for a client who came to the emergency department reporting chest pain. The provider suspects a myocardial infarction. While waiting for the troponin levels report, the client asks what this blood test will show.
Which of the following explanations should the nurse provide to the client?

Troponin is an enzyme that indicates damage to brain, heart, and skeletal muscle tissues.

Troponin is a heart muscle protein that appears in the bloodstream when there is damage to the heart.

Troponin is a protein that helps transport oxygen throughout the body.

Troponin is a lipid whose levels reﬂect the risk for coronary artery disease.

Answer and Explanation

The Correct Answer is B

Choice a) is incorrect because troponin is not an enzyme, but a protein. Enzymes are molecules that speed up chemical reactions in the body. Troponin does not have this function.

Choice b) is correct because troponin is a protein that binds to calcium and regulates the contraction of heart muscle fibers. When the heart muscle is injured, such as in a myocardial infarction, troponin leaks into the bloodstream and can be detected by a blood test. The higher the level of troponin, the more severe the damage to the heart.

Choice c) is incorrect because troponin does not help transport oxygen throughout the body. That function is performed by hemoglobin, which is a protein found in red blood cells.

Choice d) is incorrect because troponin is not a lipid, but a protein. Lipids are fats that are used for energy storage and cell membrane formation. Troponin does not have these roles.

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Correct Answer is D

Explanation

Choice a) is incorrect because elevating the client’s feet is not the priority action for a hypotensive client. Elevating the client’s feet may help increase the venous return to the heart, but it may also compromise the respiratory status of a client who has esophageal varices and is at risk of aspiration.

Choice b) is incorrect because administering a unit of packed RBCs is not the priority action for a hypotensive client. Administering a unit of packed RBCs may help increase the oxygen-carrying capacity of the blood, but it may also increase the blood viscosity and pressure, which can worsen the bleeding from the esophageal varices.

Choice c) is incorrect because initiating a dopamine IV infusion for the client is not the priority action for a hypotensive client. Initiating a dopamine IV infusion may help increase the blood pressure and cardiac output, but it may also cause vasoconstriction and tachycardia, which can increase the risk of hemorrhage and arrhythmias.

Choice d) is correct because increasing the client’s IV ﬂuid rate is the priority action for a hypotensive client. Increasing the client’s IV ﬂuid rate may help restore the intravascular volume and perfusion, which can prevent shock and organ damage. Increasing the client’s IV ﬂuid rate may also dilute the blood and reduce its viscosity and pressure, which can decrease the bleeding from the esophageal varices.

A. Sinus bradycardia B. Sinus tachycardia C. Atrial fibrillation D. First-degree AV block

Correct Answer is C

Explanation

Choice A Reason: This is incorrect. Sinus bradycardia is a slow and regular heart rate that originates from the sinus node. It does not cause irregular palpitations, fatigue, or dizziness, unless the heart rate is very low or the client has underlying cardiac disease.

Choice B reason: This is incorrect. Sinus tachycardia is a fast and regular heart rate that originates from the sinus node. It may cause fatigue or dizziness, but not irregular palpitations or pulse deficit.

Choice C Reason: This is correct. Atrial fibrillation is a fast and irregular heart rate that originates from multiple foci in the atria. It causes irregular palpitations, fatigue, dizziness, and pulse deficit due to ineﬀective atrial contractions and variable ventricular response.

Choice D Reason: This is incorrect. First-degree AV block is a delay in the conduction of impulses from the atria to the ventricles. It does not aﬀect the heart rate or rhythm, and does not cause any symptoms.

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who has esophageal varices and is hypotensive after vomiting 500 mL of blood. Which of the following actions is the nurse’s priority?

Correct Answer is D

Explanation

A nurse in an urgent care center is assessing a client who reports a sudden onset of irregular palpitations, fatigue, and dizziness. The nurse finds a rapid and irregular heart rate with a significant pulse deficit. Which of the following dysrhythmias should the nurse expect to find on the ECG?

Correct Answer is C

Explanation

A nurse is caring for a client who has hypertension and develops epistaxis. Which of the following actions should the nurse take? (Select all that apply.)

A nurse is caring for a client who is in the compensatory stage of shock. Which of the following findings should the nurse expect?

A nurse is providing discharge teaching to a client who has a new arteriovenous fistula in the right forearm. Which of the following manifestations should the nurse include in the teaching as a possible indication of venous insufficiency?

A nurse in an emergency department is caring for a client who is bleeding profusely from a deep laceration on his left lower forearm. After observing standard precautions, which of the following actions should the nurse perform first?

The nurse is evaluating a client who had a cardiac catheterization with a left antecubital insertion site. Which of the following pulses should the nurse palpate?

A nurse is helping to triage a group of clients at a mass casualty incident who were involved in an explosion at a local factory. Which of the following clients should the nurse tag to be the priority for care?

A nurse is preparing to administer dabigatran to a client who has atrial fibrillation. The nurse should explain that the purpose of this medication is which of the following?