Objective:To analyze the relationship between serum complement C1 q and severity of coronary artery stenosis in elderly patients.Method:A total of 214 patients(≥65 years old)who were hospitalied in Xiangya Hospital firstly and diagnosed as coronary artery disease were enrolled.After admission,the serum complement C1 q level was determined by immunoturbidimetric assay.Patients were divided into three groups according to the Gensini score:Quartile 1(0≤X<18)(n=56),Quartile 2(18≤X<41)(n=44)and Quartile 3(X≥41)(...