In cases of acute myocardial infarction, which enzyme is elevated within the first few hours?

In cases of acute myocardial infarction, which enzyme is elevated within the first few hours?

• A. CK-MB
• B. Troponin
• C. Myoglobin
• D. Amylase

Answer: (C)

In the context of acute myocardial infarction, myoglobin is one of the first biomarkers to become elevated in the bloodstream. It is a protein released rapidly from damaged cardiac muscle cells, and levels can begin to rise as early as 1 to 3 hours after the onset of chest pain. This rapid release makes myoglobin a useful early indicator for myocardial injury during an acute event.

While cardiac troponin (which is often elevated in myocardial infarction) also serves as a sensitive and specific marker, it typically does not rise as quickly as myoglobin does. CK-MB is another enzyme used to assess myocardial damage, but its elevation also tends to occur slightly later, usually within 4 to 6 hours after injury. Amylase is not related to myocardial infarction and is typically associated with pancreatic conditions.

Therefore, the elevation of myoglobin shortly after the onset of myocardial infarction distinguishes it as the correct answer in this scenario.