Study of the Causes of the Breakdown of Muscle Fibers in Hospitalized Patients

Inclusion Criteria: * Patients who admitted to The National Taiwan University Hospital during 2003/1/1\~2008/12/31 with the following discharge diagnosis: myoglobinuria, rhabdomyolysis, myopathy, toxic myopathy, malignant hyperthermia, neuroleptic malignant syndrome, polymyositis, myalgia and had acute neuromuscular illness presentations and serum creatinine kinase (CK) more than 5 times the upper limit of normal (male \> 900 IU/L; female \> 835 IU/L). Exclusion Criteria: * Patients with recent myocardial infarction or stroke, unless clinical history, examination, or electromyography showed a concomitant myopathy.