Which measurement helps detect myocardial injury by measuring a protein released into the blood?

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

Answer: (C)

The measurement relies on a cardiac-specific protein that leaks into the blood when heart muscle is damaged. Cardiac troponin I and troponin T are highly specific to heart tissue, so their levels rise in the bloodstream after myocardial injury. This makes troponin the best biomarker for detecting conditions like myocardial infarction, because it directly reflects cardiac cell damage and remains elevated for days, allowing diagnosis even if symptoms aren’t immediate. In contrast, the other options aren’t biomarkers of heart injury: GCS measures consciousness, Pan Scan is a CT imaging test, and a popliteal block is a leg nerve block used for anesthesia.