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Background To discuss the clinical features,coronary arterial pathological changes and prognosis of unstable angina pectoris in young and old.Methods During 2012,the patients who were diagnosed as unstable angina pectoris were selected,then according to the age,the patients who were younger than 45 or older than 65 were divided into young (n=257) and old (n=320) groups respectively.The risk factors,angiographic characteristics and prognosis were compared.