Abstract: Objective To investigate clinical and echocardiographic characteristics in patients with acute myocardial infarction(AMI).Methods 1 137 patients with AMI were analyzed in clinical terms of characteristics and echocardiographic menifestations.Results Left ventricular remolding and impaired cardiac function were found less compared with elderly patients in young patients with AMI,and more males than females in this group.Male patients with AMI were about equal to female in elderly patients with AMI.Symptoms of elderly patients with AMI were not typical.And high incidence in left ventricular remolding and left ventricular dysfunction was discovered in elderly patients with AMI.Symptoms in 40⁷4 years old group displayed between young and elder patients with AMI in clinic.Conclusion Young patients with AMI have good prognosis.Severe abnormalities in cardiac structure and function are observed in elderly patients with AMI.Elderly patients with AMI have poor prognosis.

Key words: acute myocardial infarction, echocardiography