Methods: Analysis - cross sectional study was conducted on 166 Vietnamese patients with acute coronary syndrome undergoing clinically indicated coronary angiography: control group was composed of 13 patients with no stenosis or stenosis < 50% (reduction in luminal diameter < 50%), 5 females (38%), aged from 49 to 76 and patient group consisted of 153 patients with coronary artery stenosis ≥ 50% luminal diameter, 50 females (33%), aged from 32 to 88,.