The article aims to determine the factors of early mortality in emergency coronary artery bypass grafting. Research methods. The research were included 129 patients who were hospitalized in Kyiv “Heart Center” in 2011-2015, 100 – with ST-elevated myocardial infarction, 29 – with non- ST-elevated myocardial infarction (NSTEMI). Research results. In STEMI patients vs. NSTEMI type was a higher risk of acute heart failure (p<0.05) followed by intra-aortic balloon pulsation (p<0.05) and inotropic support (p<0.05). In the STEMI group acute kidney injury was confirmed by higher indexes of absolute and relative risks (p<0.05). All cases of the transient atrioventricular block were registered in patients with STEMI (p<0.05). However, it was established that the likelihood of supraventricular arrhythmia and encephalopathy in the NSTEMI group was reliably higher (p<0.05). The level of early postoperative mortality (12.4%) proved the probable risk (p<0.05) in STEMI (log-rank - 2,74; p = 0,006). Mortality was associated with acute heart failure (56,2%), cardiogenic shock (31,3%), acute mitral regurgitation (12.5%). Emergency surgical revascularization in acute MI is an effective method of treatment and can be used taking into account clinical, hemodynamical, and coronary features of myocardial damage.