CPK-MB peaks at approximately how many hours after an acute myocardial infarction?

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Multiple Choice

CPK-MB peaks at approximately how many hours after an acute myocardial infarction?

Explanation:
Timing of CK-MB peak after an acute MI is being tested. CK-MB begins to rise within about 4–6 hours after myocardial injury, reaches its peak around roughly 18–24 hours, and then declines over the next couple of days, usually returning to baseline by 48–72 hours. The option 18–20 hours best fits the peak window. The other time frames describe the early rise (4–6 hours) or the later decline (48–72 hours), not the peak period. This timing pattern is why CK-MB was used historically to help identify myocardial infarction, though troponin is now the more specific marker.

Timing of CK-MB peak after an acute MI is being tested. CK-MB begins to rise within about 4–6 hours after myocardial injury, reaches its peak around roughly 18–24 hours, and then declines over the next couple of days, usually returning to baseline by 48–72 hours. The option 18–20 hours best fits the peak window. The other time frames describe the early rise (4–6 hours) or the later decline (48–72 hours), not the peak period. This timing pattern is why CK-MB was used historically to help identify myocardial infarction, though troponin is now the more specific marker.

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