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    Mitochondrial myopathy with episodic hyper-creatine kinase (CK)-emia (MIMECK) is a new disease entity characterized by episodic or persistent muscle weakness and elevated CK levels. We herein report two cases of MIMECK with the findings of histopathological studies. Histopathological examinations revealed strongly succinate dehydrogenase-reactive vessels. Electron microscopy showed abnormal mitochondria in the vessels and proliferating and vacuolated mitochondria under the sarcolemma. Both patients exhibited recurrent severe myalgia, weakness and increased CK levels. L-arginine treatment significantly ameliorated their muscle symptoms. These findings indicate that mitochondrial angiopathy plays an important role in the pathophysiology of MIMECK. L-arginine may be a potential therapeutic agent for this disorder.


    Satoshi Nozuma, Yuji Okamoto, Itsuro Higuchi, Junhui Yuan, Akihiro Hashiguchi, Yusuke Sakiyama, Akiko Yoshimura, Yujiro Higuchi, Hiroshi Takashima. Clinical and Electron Microscopic Findings in Two Patients with Mitochondrial Myopathy Associated with Episodic Hyper-creatine Kinase-emia. Internal medicine (Tokyo, Japan). 2015;54(24):3209-14

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    PMID: 26666615

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