NCLEX-PN
Nclex Practice Questions 2024 Questions
Extract:
Question 1 of 5
Which laboratory test would be the least effective in diagnosing a myocardial infarction?
Correct Answer: A
Rationale: AST, choice A, would be the least effective in diagnosing a myocardial infarction as it is not specific for this condition. Troponin, CK-MB, and myoglobin (choices B, C, and
D) are more specific markers for myocardial infarction. Troponin is considered the gold standard due to its cardiac specificity. CK-MB is also specific to the heart, and its isoenzyme levels elevate post-heart damage. Myoglobin, although elevated in myocardial infarction, is not as specific as troponin and CK-MB and can also increase in conditions like burns and muscle trauma.
Therefore, AST is the least effective choice for diagnosing a myocardial infarction.
Question 2 of 5
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Question 3 of 5
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Question 4 of 5
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Question 5 of 5
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