Importance of cTnI immunoassays

In recent years, with the continuous improvement of cTnI detection method, cTnI has become one of the most clinically valuable markers of myocardial injury, and has been widely used in the clinical diagnosis and detection of cardiac diseases. cTnI, which appears early and lasts for a long period of time in blood and can be detected rapidly, has significant value in many fields, such as predicting infarct size, evaluating the effect of thrombolysis, and distinguishing unstable angina pectoris as well as myocardial and skeletal muscle injuries.

Detection Methods

Currently there are immunogold labeling techniques, radioimmunoassay, ELISA, chemiluminescence, ELFA and other detection methods.

Importance of cTnI immunoassays

Clinical significance


Diagnosis of AMI

Acute myocardial infarction ( acute myocardial infarction , AMI ) is a common acute and frequent clinical disease, correct diagnosis and timely treatment is important to save dying myocardium, to reduce the acute stage of the morbidity and mortality rate. Troponin is a regulatory protein on myofibers in cardiomyocytes and consists of 3 subunits (cTnI, cTnT, cTnC). Troponin I is a regulatory protein secreted by cardiomyocytes and is localized in fast skeletal muscle, slow muscle and cardiac muscle, respectively. When myocardial injury occurs, cardiomyocytes can continuously secrete cTnI and enter the circulation, resulting in a rapid increase of cTnI levels in the blood. Serum cTnI concentration shows a bimodal change, and the diagnostic time window is up to several weeks, which is wider than that of creatine kinase isoenzyme MB (CK-MB), and the sensitivity is higher than that of CK-MB. It is gradually replacing CK-MB as the “gold standard” for determining myocardial injury, especially AMI.


Assessment of thrombolytic efficacy

The sensitivity of cTnI, cTnT, CK and CK-MB as indicators of thrombolytic efficacy was 95%, 80%, 54% and 56%, respectively, and the specificity was 100%, 89%, 79% and 82%, respectively. cTnI has a high clinical value in evaluating thrombolytic efficacy.

 Diagnosis of myocarditis

cTnI is valuable in evaluating the outcome of viral myocarditis, which helps to guide treatment and stop the development of cardiomyopathy after myocarditis. The sensitivity and specificity of measuring cTnI to reflect myocardial injury has been used as one of the important bases for the diagnosis of myocarditis.

 Diagnosis of heart failure

Some patients with heart failure have elevated cTnI in serum, and their cardiac function and prognosis are significantly worse than those of patients with normal cTnI, but with the improvement of the condition, the cTnI in serum returned to normal level. cTnI is closely related to the severity and outcome of heart failure, and it has certain clinical value for the diagnosis of heart failure.

Recent risk stratification in acute coronary syndromes

The degree of necrosis of cardiomyocytes is an important indicator for determining their near-term mortality, and cTnI has high clinical value for the near-term risk stratification of ACS.


Assessment of postoperative myocardial injury

cTnI is highly sensitive and specific in diagnosing perioperative AMI. During aortic valve replacement, aortic cross-clamp time was highly correlated with cTnI values, suggesting that cTnI is a reliable indicator of ischemia during cardiac surgery and can be used as a protective measure in the evaluation of cardiac function.

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Importance of cTnI immunoassays


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