摘要（请帮忙翻译成英文）

Purpose analyses impatient young and middle-aged cardiac muscle infarction (AMI) clinical characteristic and dangerous factor , prevention and cure provides a basis to early phase. That method receives and cures my yard 48 example young and middle-aged AMI patients and 108 coeval example old age AMI patients carry out contrast , the disease incentive , clinical manifestation , infarction many ways such as location and complication carry out comparison from the two set of dangerous factor , gender differences. Result young and middle-aged group coronary heart disease clan history , obvious dangerous two factor group higher than old age (P having a smoke <0.05); Hypertension , glycuresis are notable be lower than old age group (P <0.01); New dangerous factors such as CRP , Fig , Lp (a) has not seen obvious difference two set. The young and middle-aged patient of group morbidity to have much making the incentive , the clinical manifestation model clear, crown pulse lesion gives f