五、脂肪酸结合蛋白（FABP）
是一组至少由6种不同相对分子质量组成的蛋白质（14 000～15 000）。存在不同脏器中，心脏中的FABP和肝、小肠中的有明显区别。它是长链脂肪酸的载体，在脂酸酸代谢中起作用，而心脏中的脂肪酸在能量代谢中起重要作用，心肌缺氧时FABP在血中升高，特别由于其分子量小和心肌中含量很高（0.46 mg/g湿重）AMI早期就可查到其升高。有学者［11］在10例AMI患者中发现所有早期标本（发病1.5～4 h）FABP都升高而CK-MB仍在正常范围。另一研究［12］也发现在发病早期阶段（0～3 h）FABP和CK-MB的临床灵敏度分别为91.4%和20%,FABP显著高于CK-MB。
六、坏死标志物
在拙作"生化标志物在缺血性心脏病诊断中的临床价值"一文中对坏死标志物已有了较详细的介绍，特别是肌钙蛋白T和I，此不再叙述。最近人们对α-肌动蛋白给予一定的注意。 α-肌动蛋白是细丝的结构蛋白，相对分子质量43 000。其特点为含量很高，占细胞蛋白库的20％，高出肌钙蛋白和肌球蛋白7倍。所以如果能建立特异性和灵敏度很高的方法。有希望能查出微小的心肌损伤。初步的应用显示有一定的前景，在29例不稳定心绞痛患者中有 19例血中α-肌动蛋白升高。 70例AMI患者［13］阳性率为95%。但可惜同时未查肌钙蛋白和 CK-MB，无法确切判断其实用价值。
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