A patient who has had 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?.
Cardiac-specific troponin.
Myoglobin.
Homocysteine.
C-reactive protein.
The Correct Answer is A
Choice A rationale:
Cardiac-specific troponin is a protein that is released into the bloodstream when there is damage to the heart muscle, such as during an acute myocardial infarction (AMI). It is considered the most specific marker for AMI because it is found only in heart muscle. The normal range for troponin I is between 0 and 0.04 ng/mL2.
Choice B rationale:
Myoglobin is a protein found in heart and skeletal muscles. While it can be elevated in AMI, it is not as specific as troponin because it is also found in skeletal muscles. The normal levels of myoglobin are 25 to 72 ng/mL4.
Choice C rationale:
Homocysteine is an amino acid in the blood, and high levels can increase the risk of heart disease. However, it is not specific for AMI5. The normal range of homocysteine levels are less than 15 micromoles per liter.
Choice D rationale:
C-reactive protein (CRP) is a marker of inflammation in the body and can be elevated in various conditions, including heart disease. However, it is not specific for AMI6. The normal CRP level is less than 0.9 milligrams per deciliter.
So, the correct answer is A, after analyzing all choices.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
Teaching the patient to take deep, slow breaths might not be effective in controlling the pain due to acute pericarditis.
Choice B rationale:
Placing the patient in Fowler’s position, leaning forward on the table, can help relieve the pain associated with acute pericarditis.
Choice C rationale:
Forcing fluids to 3000 mL/day to decrease inflammation is not a recommended action for managing pain due to acute pericarditis.
Choice D rationale:
Providing a fresh ice bag every hour for the patient to place on the chest is not a recommended action for managing pain due to acute pericarditis.
So, the correct answer is B, after analyzing all choices.
Correct Answer is D
Explanation
Choice A rationale:
The right upper-sternal border is not the best place to hear a murmur typical of mitral regurgitation.
Choice B rationale:
The left upper-sternal border is not the best place to hear a murmur typical of mitral regurgitation.
Choice C rationale:
The left lower-sternal border is not the best place to hear a murmur typical of mitral regurgitation.
Choice D rationale:
The apex of the heart is the best place to hear a murmur typical of mitral regurgitation. This is where the sound will be most audible.
So, the correct answer is Choice D, after analyzing all choices.
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