Case presentation A 73-year-old female was admitted into the Institute of Geriatric Cardiology,Chinese PLA General Hospital because of sudden chest pain accompanied with nausea and vomiting for 15 hours.At 3:00 on August 14th,2011,the patient suddenly suffered from severe chest pain accompanied with perspiration,nausea,vomiting,and cold extremities,but she was under normal conscious level.In the emergency room,electrocardiogram(ECG) at 18:00 showed ST segment elevation on the precordial leads.Cardiac biochemical markers increased proportionally.The patient had a history of hypertension for 10 years which was poorly controlled,chronic bronchitis for several years,cerebral ischemia attack one month ago,and diarrhea one day before admission.She denied any history of smoking,alcohol drinking,or illicit drugs use.