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目的研究一种具有高度敏感性和特异性的血清标记物,能够早期对急性心肌梗死患者进行检测和诊断。方法收集400例诊断为急性心肌梗死患者的血液标本,分别对所采血液进行肌钙蛋白(IcTnI)和肌酸激酶同工酶MB(CK-MB)水平的定量检测,研究其阳性率、敏感性和特异性。结果阳性率:cTnI为93.4%,CK-MB为32.1%;敏感性:cTnI为100%,CK-MB为48.2%;特异性:cTnI为93.4%,CK-MB为32.1%。结论cTnI阳性结果对急性心肌梗死患者发生具有高度的预见性,cTnI的阴性结果显示急性心肌梗死患者发生机率很小。cTnI可作为心肌细胞受损时一种高度敏感性和特异性的血液标记物。cTnI可以早期预见急性心肌梗死(AMI)患者微血栓的形成,cTnI也可以作为一种排除不稳定型心绞痛患者发生心肌梗死的标记物。
Objective To study a highly sensitive and specific serum marker for the early detection and diagnosis of acute myocardial infarction. Methods Blood samples were collected from 400 patients diagnosed as acute myocardial infarction. Quantitative detection of troponin I (CK) and creatine kinase MB (CK-MB) in the collected blood samples was performed to investigate the positive rate and sensitivity Sexual and specific. Results The positive rate of cTnI was 93.4% and CK-MB was 32.1%. The sensitivity was 100% for cTnI and 48.2% for CK-MB. The specificity was 93.4% for cTnI and 32.1% for CK-MB. Conclusion The cTnI positive results are highly predictive of acute myocardial infarction. The negative results of cTnI showed that the incidence of acute myocardial infarction was very low. cTnI serves as a highly sensitive and specific blood marker for cardiomyocytes. cTnI can early predict the formation of microthrombi in patients with acute myocardial infarction (AMI), and cTnI can also be used as a marker of myocardial infarction in patients with unstable angina.