PEBC Cardiology Practice Test

Which statement accurately describes CK and troponin elevations in myocardial infarction?

CK elevations occur for 7-10 days; Troponin elevations may persist for 7-10 days Troponin elevations may persist for 7-10 days; CK elevations occur for 48-72 hours CK elevations for 48-72 hours; Troponin elevations for 7-10 days CK elevations for 24-48 hours

Correct Answer:

CK elevations for 48-72 hours; Troponin elevations for 7-10 days

Explanation:

After a myocardial infarction, the timing of marker elevation reflects the injury pattern. CK rises about 4–6 hours after onset, peaks around 24 hours, and returns to baseline within roughly 48–72 hours. Troponin I or T rises a bit later, within 3–6 hours, peaks at 12–24 hours, and remains elevated for about 7–10 days (sometimes longer in larger infarcts). This means the statement describing CK elevations lasting 48–72 hours and troponin elevations lasting 7–10 days fits the typical pattern. The other options mix shorter or longer windows than what is usually observed for these markers.

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