A patient presents two hours after the onset of chest pain. Which marker is most likely to be increased at this early time point?
1Cardiac troponin only
2Lactate dehydrogenase
3Myoglobin✓ 정답
4Alkaline phosphatase
해설
Myoglobin is a small molecule and appears in the circulation earliest after myocardial injury, but it also rises with skeletal muscle damage, so its specificity is low. Troponin is far more specific but takes longer to rise. Read the stem carefully to see whether early rise or specificity is being asked.