The investigators assume to enroll consecutive 1000 patients with symptomatic coronary artery disease admitted to 2nd Dept. of Cardiology in Zabrze, Medical University of Silesia for coronary angiography or interventional treatment of the disease. Patients of both sexes aged ≥ 65 years are eligible. An information on study rationale, objectives, and methodology is presented to patients and written, informed consent is required to participate in the study.