troponin
A protein released into the blood when heart muscle is damaged, serving as a biomarker for myocardial injury.
Full Definition
Troponin is a regulatory protein complex found in cardiac and skeletal muscle that becomes elevated in blood when myocardial cells are damaged or die. Cardiac troponin I (cTnI) and cardiac troponin T (cTnT) are highly specific biomarkers for myocardial injury, with high-sensitivity assays capable of detecting very small amounts of cardiac damage. Troponin elevation is essential for diagnosing acute myocardial infarction and occurs in various conditions causing myocardial injury, including myocarditis, pulmonary embolism, sepsis, and chronic kidney disease. The timing and pattern of troponin release helps differentiate acute from chronic conditions.
Usage
Usage note: Specify troponin subtype (I or T) and assay sensitivity when relevant; include units (ng/mL or ng/L).
In Context
- "Serial troponin levels peaked at 15.2 ng/mL, confirming acute myocardial infarction." — Emergency medicine documentation
- "High-sensitivity troponin was undetectable, effectively ruling out acute coronary syndrome." — Chest pain evaluation