BackgroundThe cardiovascular disease is leading cause of mortality and constantly increasing every year forpast decades. In 2014, cardiovascular diseases were the leading cause of NCD deaths (17.5 milliondeaths) [7] In Mongolia cardiovascular disease is also leading the cause of mortality and morbidity.It is increasing every year, 479.4 per 10000 population in 2012 was increased to 848.1 per 10000population in 2013 [1, 2].Dr.Jerardin, prof. Z.Lkhagvasuren implanted first stent in Mongolia in 2000. There is rapiddevelopment in interventional cardiology treatment since then.Material and MethodsSince 2011 until 2015, total of 4545 coronary angiography, 2322 stent implantation was performed.This study has included the patients of last 5 years. Total of 1257 patients who were treated with AMIduring 2011 to 2015 at the Third central State Hospital were analyzed.Results73.7% of the patients had left coronary artery disease and 26.3% had right coronary artery disease.Tis findings were similar with other local researcher’s study [3, 4].59.4% of the occlusions were 75-99% stenosis, 23.5% had total occlusion. 62.9% of LAD occlusionwere stenosis over 75%. It demonstrated majority of cases performed were high severe lesions. Thisalso may be demonstrating that patients are receiving treatment in their late stage of the disease.Every stage complication such as mortality, was 3.5%, complication such as restenosis followingone month of after stent implantation was 9-13.1%. Overall mortality rate has decreased each year,11.9% in 2011, 7.8% in 2012, and 4.6% in 2013 relatively. General achievement is now 88.1-95.4%,which is comparable to other countries.Conclusion1257 patients presented with acute myocardial infarction were studied: 880 (70, 0%) were male, 377(30, 0%) were female. Mean age of patients was 55, 08±1, 23; it was 75 patients had no risk factors,751 patients with 1-2 risk factors, 431 patients with 3 or more risk factors. Angiographic distributionof lesion shows 74, 4% had LAD disease, 64, 5% had RCA disease, 25, 8% had LCX lesion, 12, 9%had dialonal LCA lesion.