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Objective: To compare the frequency of new onset perioperative myocardial infarction in patients undergoing coronary artery bypass graft with and without long cross clamp time. Study Design: Randomized Control Trial. Setting: Department of Cardiac Surgery at the CH. Muhammad Akram Teaching and Research, Lahore. Period: 10th Feb 2023 to 10th June 2023. Methods: Patients were admitted through out-patient department one week prior to the operation and randomized to Group L (longer aortic cross-clamp time) and Group S (shorter time). Preoperative electrocardiogram was recorded for every patient. After surgery patients were shifted to intensive care unit. Development of perioperative myocardial infarction was the major outcome variable. Results: In our study, frequency of perioperative myocardial infarction in both groups was 7% in Group-L and 3% in Group-S with a p value was 0.19. Conclusion: In summary, our study sheds light on the notable difference in the frequency of perioperative myocardial infarction among patients undergoing CABG, particularly in relation to cross clamp time. While our findings present valuable insights, the necessity for further validation through multicenter trials with a larger sample size is evident. [ABSTRACT FROM AUTHOR]