Background: Management ofpatients with impaired left ventricular functionremains challenging in spite of the progress achieved in medical therapies and surgical techniques. Objectives: Detecting the impact of revascularization on the left ventricular function in low ejection fraction patient's ≤ 35% after coronary artery bypass. Patients and Methods: Twenty three patients with impaired left ventricular function were subjected to coronary artery bypass grafting (CABG) during the period from January 2017 to January 2018 at military prince Khalid Ben Sultan Centre, Saudi Arabia. The only inclusion criterion was preoperative ejection fraction (EF) ≤ 35%. Echocardiography assessments were done preoperatively and early postoperatively (three months after CABG). Results: Baseline preoperative transthoracic echocardiography assessment (TTE) was done for the twenty three patients and revealed that the mean end diastolic diameter (EDD) was 5.2 ± 0.08 mm, the mean end systolic diameter (ESD) was 4 ± 0.1 mm and the mean ejection fraction was 30 ± 1.1%. The first 3 months after CABG, the mean ejection fraction increased significantly from 30 ±1.1% at baseline TTE to 36 ±1.6 %. Moreover, the mean EDD decreased significantly from 5.2±0.08 mm at baseline TTE to 4.8±0.2 mm at early follow up. However, the reduction in the ESD from 4±0.1 mm at baseline to 3.8±0.2 mm postoperatively was insignificant. Conclusion: The low EF patients undergoing CABG showed significant improvement in LV function by 20% increase in EF in the early postoperative follow up.