A patient who has been experiencing chest pain for several hours is admitted with a diagnosis of rule out acute myocardial infarction (AMI). Which laboratory test is most specific for the nurse to monitor in determining whether the patient has had an AMI?
Homocysteine.
C-reactive protein.
Myoglobin.
Cardiac-specific troponin.
The Correct Answer is D
Choice A rationale
Homocysteine is an amino acid that your body uses to make protein and to build and maintain tissue. But too much homocysteine in your blood might increase your risk of heart disease.
However, it is not the most specific marker for AMI.
Choice B rationale
C-reactive protein (CRP) is produced by the liver and its level rises when there is inflammation in your body. While its level can increase in those with a heart attack, it is not the most specific marker for AMI6.
Choice C rationale
Myoglobin is a small protein that stores oxygen. It is measured occasionally. Myoglobin is sometimes measured in addition to troponin to help diagnose a heart attack. However, it is not as specific as cardiac-specific troponin.
Choice D rationale
Cardiac-specific troponin is a cardio-specific, highly sensitive marker for myocardial damage. The absolute cardiospecificity of cTnI allows the diagnosis of myocardial infarction distinct from muscle lesions and non-cardiac surgery.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Propranolol (Inderal) is a beta-adrenergic receptor blocker, also known as a beta-blocker. Beta-blockers can increase airway reactivity and may interfere with the activity of beta-agonists. They should be used with great caution or not at all in patients with chronic asthma.
However, beta blockers are safe for use in most patients with COPD, but less so in patients with asthma. Therefore, Propranolol (Inderal) is not recommended for patients with chronic obstructive pulmonary disease (COPD) and asthma.
Choice B rationale
Captopril (Capoten) is an ACE inhibitor, which is among the most widely used antihypertensive drugs. They are not contraindicated in asthma or COPD, but they can induce a bothersome cough that, although not damaging to the lungs, can be confused with cough due to underlying pulmonary diseases such as asthma and COPD1.
Choice C rationale
Diltiazem (Cardizem) is a calcium antagonist. There is no specific contraindication for using calcium antagonists in patients with COPD or asthma. These medications work by relaxing the muscles of your heart and blood vessels, but they do not have a direct effect on airway reactivity or lung function.
Choice D rationale
Hydrochlorothiazide (HydroDIURIL) is a diuretic. Diuretics help your body get rid of excess salt and water, primarily by stimulating your kidneys. They do not have a direct effect on airway reactivity or lung function, and there is no specific contraindication for using them in patients with COPD or asthma.
Correct Answer is D
Explanation
Choice A rationale
Increasing glomerular filtration would result in increased urine output, not decreased venous return. This action is not directly related to the therapeutic action of nitroglycerin.
Choice B rationale
While enhancing the contractility of the myocardium would increase oxygen delivery, this is not the primary action of nitroglycerin. Nitroglycerin primarily works by dilating the blood vessels, which reduces the amount of work the heart has to do and increases the blood supply to the heart muscle.
Choice C rationale
Nitroglycerin does not produce an immediate analgesic effect. While it can relieve chest pain, it does so by increasing blood flow to the heart, not by acting as an analgesic.
Choice D rationale
Nitroglycerin increases the coronary blood supply and decreases the afterload314. By dilating the blood vessels, nitroglycerin reduces the amount of work the heart has to do and increases the blood supply to the heart muscle. This is the primary therapeutic action of nitroglycerin in alleviating chest pain.
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