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 A

Explanation

The correct answer is: A. Elective cardioversion

Choice A reason:

Elective cardioversion is a medical procedure that is used to restore a normal heart rhythm in patients experiencing certain types of arrhythmias, including ventricular tachycardia (VT), when they are stable. It involves the delivery of a controlled electric shock to the heart, which is synchronized with the heart's electrical activity to convert the abnormal rhythm back to a normal sinus rhythm. This procedure is typically performed when VT is not causing hemodynamic instability and the patient is not in immediate danger.

Choice B reason:

Defibrillation is an emergency treatment for life-threatening cardiac arrhythmias, particularly ventricular fibrillation (VF) or pulseless ventricular tachycardia. It involves delivering a high-energy electric shock to the heart unsynchronized to the heart's electrical cycle, aiming to reset the heart's electrical state and allow it to reestablish an effective rhythm. In the scenario provided, where the patient is experiencing VT but not VF, defibrillation would not be the first line of action unless the VT deteriorates into VF or the patient becomes pulseless.

Choice C reason:

CPR, or cardiopulmonary resuscitation, is a lifesaving technique useful in many emergencies, including heart attack or near drowning, in which someone's breathing or heartbeat has stopped. In the case of VT, if the patient is conscious and has a pulse, CPR is not indicated. CPR would only be necessary if the patient's heart stops beating (cardiac arrest) as a result of the VT.

Choice D reason:

Radiofrequency catheter ablation is a procedure used to treat some types of arrhythmias, including VT, by destroying the area of heart tissue that is causing the abnormal heart rhythm. This treatment is generally considered when medication is ineffective or not tolerated, or in recurrent VT. It is not typically the first line of treatment in an acute setting where the patient is stable and experiencing VT.

A. Flushing of the skin B. Oliguria C. Hypertension D. Bradypnea

Correct Answer is B

Explanation

Choice A Reason: This is incorrect. Flushing of the skin is not a sign of hypovolemic shock, but rather of vasodilation or fever. Hypovolemic shock causes vasoconstriction and pale, cool, clammy skin.

Choice B Reason: This is correct. Oliguria is a decreased urine output that indicates reduced renal perfusion due to hypovolemia. The normal urine output for an adult is 0.5 to 1 mL/kg/hr.

Choice C Reason: This is incorrect. Hypertension is not a sign of hypovolemic shock, but rather of increased vascular resistance or ﬂuid overload. Hypovolemic shock causes hypotension due to decreased blood volume and cardiac output.

Choice D Reason: This is incorrect. Bradypnea is a slow respiratory rate that indicates respiratory depression or fatigue. Hypovolemic shock causes tachypnea due to hypoxia and increased metabolic demand.

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Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who reports heart palpitations. An ECG confirms the client is experiencing ventricular tachycardia (VT). The nurse should anticipate the need for taking which of the following actions?

Correct Answer is A

Explanation

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Correct Answer is B

Explanation

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