NCLEX PN Practice Questions Practice Question
A 54-year-old male is admitted to the cardiac unit with chest pain radiating to the jaw and left arm. Which enzyme would be most specific in the diagnosis of a myocardial infarction?
Correct Answer: D
Rationale: CK-MB (creatine phosphokinase muscle bond isoenzyme) is the most specific for a myocardial infarction. Troponin is also extremely reliable. Answers A, B, and C are nonspecific to myocardial infarctions, so they are incorrect.
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