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心肌肌钙蛋白Ｉ（ＣＴｎＩ）为心肌肌钙蛋白（ＣＴｎ）的三个亚单位之一，仅存在于心肌收缩蛋白的细肌丝上，在肌肉收缩和舒张过程中起重要作用。ＣＴｎＩ是心脏特异性抗原，其释放入血循环是心肌细胞损伤的高度敏感和特异性的标志，对某些儿科心血管疾病的诊断及预后有重要意义。
Cardiac troponin I (CTnI), one of the three subunits of cardiac troponin (CTn), exists only on the myofilament of myocardial contractile proteins and plays an important role in muscle contraction and relaxation. CTnI is a cardiac specific antigen, its release into the blood circulation is a highly sensitive and specific marker of myocardial cell injury, for some pediatric cardiovascular disease diagnosis and prognosis of great significance.