Troponin I is a subtype of troponin with high myocardial specificity. Elevated troponin I in the blood reflects myocardial cell damage. Its continuous measurement can be used for the diagnosis，dynamic monitoring and therapy evaluation of acute myocardial infarction. Troponin I levels were detected within 3–6 hours after chest pain, and peaked after approximately 12–16 hours and continued for 4–9 days after AMI. The combined detection of troponin I and creatine kinase isoenzyme and myoglobin is a common diagnostic indicator for myocardial infarction in clinical practice.