Which biomarker is released into the bloodstream when heart muscle is damaged?

• A. Hemodynamics
• B. Pan Scan
• C. Troponin
• D. Popliteal block

Answer: (C)

When heart muscle is damaged, certain proteins from the cardiac cells spill into the bloodstream. Cardiac troponin I and troponin T are highly specific to heart muscle, so their presence in the blood is a clear signal of myocardial injury. That's why troponin is the primary biomarker used to diagnose heart damage, such as a heart attack. Levels rise within a few hours after injury, peak around a day, and stay elevated for several days, making them reliable indicators over time. The other options aren’t biomarkers for heart muscle injury: hemodynamics relates to blood flow dynamics, a pan scan is an imaging test, and a popliteal block is a nerve block.