肌酸激酶(CK)广泛存在于人骨骼肌、心肌及人脑组织中。CK由两个亚单位组成,按其组织来源称为M和B亚单位,构成3种CK同功酶;按电泳速度快慢分为BB、MB和MM型。这3种同功酶都是分别由M和B亚单位组成的二聚体,分子量约86kD。在骨骼肌CK同功酶中主要为MM;脑CK中BB占优势;人心肌组织中含MM及MB。临床上急 Creatine kinase (CK) is widely found in human skeletal muscle, cardiac muscle and human brain tissue. CK consists of two subunits, according to their organization sources known as M and B subunits, constitute three kinds of CK isozyme; according to the electrophoresis speed is divided into BB, MB and MM type. These three isozymes are dimers consisting of M and B subunits, respectively, with a molecular weight of about 86 kD. In skeletal muscle CK isoenzyme is mainly MM; BB in brain CK is predominant; human myocardium contains MM and MB. Clinical emergency