The degree of coronary artery affected Characteristics n Rate% Moderately narrow 35 21, 6 Narrow 67 41, 4 Very narrow 58 35, 8 Close narrow 2 1, 2 Total 162 100 All most of patients with coronary artery affected are narrow and very narrow, in which, the narrow is 67 pat ients (accounting for 41.4%), the very narrow is 58 patients (accounting for 35.8%).