391Rev Bras Cir Cardiovasc | Braz J Cardiovasc SurgRev Bras Cir Cardiovasc 2013;28(3):391-
392Rev Bras Cir Cardiovasc | Braz J Cardiovasc Surg Bras Cir Cardiovasc 2013;28(3):391-400 Sussenbach CP, et al. -Unstable angina does not increase mortality in coronary artery bypass graft surgery twenty minutes (if not interrupted by the nitroglycerin), 2) is described as an intense and frank pain and recent onset (less than 1 month), 3) occurs in a crescendo pattern (e.g., more intense, prolonged or frequent than previously), in the absence signs of myocardial necrosis (elevation of cardiac enzymes). On the ohter hand, the European System Risk in Cardiac Operations (EuroSCORE) defines UA as anginal pain at rest that requires treatment with intravenous nitroglycerin to the surgical procedure. For purposes of this study UA was defined as acute coronary syndrome without ST elevation (ACSST) and without enzyme and/or class IV angina [6,7].
RevAccording to current recommendations on UA, taking into account the patient's risk, CABG is indicated in cases of severe injury of the left main coronary artery, threevessel disease with impaired left ventricular function (left ventricular ejection fraction < 0.5 ); two-vessel lesion with involvement of the proximal left anterior descending artery or decreased left ventricular function or provoked ischemia. Life expectancy, associated diseases, symptom severity and amount of viable myocardium at risk are also important factors [5,8,9].