OBJECTIVE To explore the changes of serum miR and Th indexes of patients with viral myocarditis and observe the intervention effect of Shuanghuanglian injection so as to provide guidance for clinical treatment.METHODS A total of 42 patients with viral myocarditis who were treated in the hospital from Feb 2014 to Dec2015were recruited as the study objects and randomly divided into the control group(conventional treatment of viral myocarditis)with 21 cases and the observation group(conventional treatment plus...