Cardiac Disorders NCLEX Questions Nursing Practice Question
Which cardiac enzyme would the nurse expect to elevate first in a client diagnosed with a myocardial infarction (MI)?
Correct Answer: C
Rationale: Troponin (C) rises within 3–4 hours post-MI, making it the earliest marker. CK-MB (A) rises in 4–6 hours, LDH (B) in 24–48 hours, and WBCs (D) are nonspecific.