Tehran University of Medical Sciences The Research in Heart Yield and Translational Medicine (RHYTHM) 3115-7270 2 3 2007 07 20 167 172 Saeed Davoodi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. Abbasali Karimi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. Seyed Hossein Ahmadi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. Mehrab Marzban Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran Namvar Movahhedi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran Kyomars Abbasi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran Abbas Salehi Omran Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran Mahmood Shirzad Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. Mehrdad Sheikhvatan Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. Seyed Hesameddin Abbasi Tehran Heart Center, Medical Sciences/University of Tehran, Tehran, Iran. 2015 10 03 Background: Left ventricular dysfunction is one of the most powerful predictors of early and late outcomes in patients who undergo coronary artery bypass grafting (CABG). The aim of this study was to assess the early results of CABG that predict 30-day mortality and prolonged length of hospital stay (LOS) after CABG in patients with an ejection fraction (EF) of 30% or less. Methods: Seven hundred seven patients who underwent CABG with EF≤30% in Tehran Heart Center between January 2002 and January 2006 were entered and compared with 9467 patients with EF>30% as the control group. Demographic and clinical characteristics and postoperative complications were considered. Results: The thirty-day mortality rate (2.3% vs. 0.8%, P<0.0001), the mean of LOS (P<0.0001), and the mean of the length of ICU stay (P<0.0001) were higher in the severe left ventricular dysfunction group than in the control group. In patients with severe left ventricular dysfunction, the mean of NYHA score (P=0.0081), prolonged ventilation (P=0.0051), and renal failure (P=0.0606) were related to the 30-day mortality rate. Also, the prolonged LOS in these patients was correlated with the female gender (P=0.0018) and atrial fibrillation (P=0.0164). Conclusion: Although left ventricular dysfunction is itself an important strong risk factor in patients undergoing CABG, the early outcome of CABG in patients with left ventricular dysfunction is acceptable and the management of this factor will help to reduce the mortality and total length of stay in hospital. https://rhythm.tums.ac.ir/index.php/jthc/article/view/61 https://rhythm.tums.ac.ir/index.php/jthc/article/download/61/59