Background: Coronary artery bypass graft (CABG) surgery can result in serious complications for the patients. It is being currently performed with cardiopulmonary bypass with cardiac arrest in 80% of the cases across the world. There have debate in the past regarding the cardiac revascularization via CABG approaches.

Aim: The aim of this study is to study the difference in the patient’s ICU stay who have low ejection fraction and are undergoing cardiac revascularization between off pump and on pump coronary artery bypass grafting.

Methodology: A sample size of 60 patients has been taken in the study with 30 patients' in the on-pump surgery group and 30 patients' in the off-pump surgery group. The data has been collected from department of Cardiac Srugery AFIC/NIHD, Rawalpindi.

Results and Conclusion: The study concludes that the on-pump CABG patients tend to have shorter ICU stay than the off-pump CABG patients who have low ejection fraction and are undergoing cardiac revascularization. Therefore, on-pump treatment is recommended in the study.

Keywords: Off pump, on pump, coronary artery bypass grafting, ICU stay, low ejection fraction, cardiac revascularization