Correlation of Ejection Fraction, Diastolic Function and Left Ventricular Volume Index Preoperative with Major Cardiovascular Events During Postoperative Treatment of Coronary Artery Bypass Graft I Gede Angga Yogiswara1, Ida Bagus Rangga Wibhuti1, I Komang Adhi Parama Harta2 Abstract Background: Technological advances in coronary artery bypass graft surgery can improve patient