Which biomarker is specifically associated with heart muscle injury?

Which biomarker is specifically associated with heart muscle injury?

• A. A lipid involved in energy storage.
• B. A type of protein molecule only found in heart muscle.
• C. Troponin.
• D. A blood clotting factor produced in the liver.

Answer: (C)

The key idea is that specific blood biomarkers rise when heart muscle is damaged. Troponin is released into the bloodstream when heart muscle cells are injured, and the cardiac-specific forms (troponin I and troponin T) are highly specific to cardiac tissue. Because they remain elevated for a period after injury, troponin levels are the most reliable indicator used to diagnose myocardial injury such as a heart attack. Other options don’t reflect heart muscle damage in the same way. A lipid involved in energy storage isn’t a marker of heart injury, and a liver-produced clotting factor points to coagulation rather than muscle damage. A protein purportedly unique to heart muscle isn’t as well established as a diagnostic biomarker as troponin.

The key idea is that specific blood biomarkers rise when heart muscle is damaged. Troponin is released into the bloodstream when heart muscle cells are injured, and the cardiac-specific forms (troponin I and troponin T) are highly specific to cardiac tissue. Because they remain elevated for a period after injury, troponin levels are the most reliable indicator used to diagnose myocardial injury such as a heart attack.

Other options don’t reflect heart muscle damage in the same way. A lipid involved in energy storage isn’t a marker of heart injury, and a liver-produced clotting factor points to coagulation rather than muscle damage. A protein purportedly unique to heart muscle isn’t as well established as a diagnostic biomarker as troponin.