The aim of the study was to provide the data on the course of myocardial infarction (Ml) associated with diabetes mellitus (DM) in hospital. Material and methods. 102 patients with Ml were included in two cohorts, first with DM, second — without DM. Groups were compatible by gender, age and standard therapy. Results. Angiocoronarography data have revealed that patients of group 1 were characterized by multiple vessels lesion due to "rescue" angioplasty with stenting performed 5 times. Patients with DM demonstrated in-hospital higher rate of both acute (by Killip) and chronic (by NYHA) heart failure of advanced degrees as well as recurrent Ml, early postinfarction angina pectoris, heart rhythm disorders and hematomas due to injections. Conclusion. The previously mentioned results lead to higher mortality in this group. Significant elevation of CRP, interleukin-6 and epidermal growth factor levels proved more activated systemic inflammatory response in patients with Ml and DM playing key role in pathogenesis of complications of the disease