Objective To study the influence of the prognosis of fragmented QRS wave( f QRS) on patients with acute myocardial infarction( AMI). Methods 562 cases of hospitalized patients with the diagnosis of AMI were randomly selected and12-lead electrocardiogram QRS wave form was observed,with f QRS patients as observation group,the rest as control group. The clinical characteristics,hospital survival rates,1 year incidence of cardiac events and survival rates of two groups were analyzed.Results There were 269 cases...