Unveiling Cardiovascular Outcomes: A Comparative Analysis of CABG Recipients versus Non-CABG Patients in the Management of Acute Coronary Syndrome (ACS)

Background: The history of bypass surgery for coronary arteries and subsequent coronary angioplasty is a crucial and vital issue for patients with acute coronary syndrome (ACS). This study aims to investigate and compare the occurrence of cardiovascular events in patients with a history of Coronary Artery Bypass Grafting (CABG) versus those without such a history, specifically focusing on individuals diagnosed with ACS. Materials and Methods: This cohort study was conducted at Madani Hospital in Tabriz, Iran. Patients diagnosed with ACS who were hospitalized and underwent Percutaneous Coronary Intervention (PCI) from the beginning of 2018 to the beginning of 2020 were included. The records for follow-up regarding mortality and cardiovascular events were documented for the next three years (2020 to 2023). Subsequently, patients were categorized into two groups: those with a history of CABG and those without a history of CABG. Patients of each study group were divided into two groups: ST-segment elevation acute coronary syndrome (STEA)CS/primary PCI and non-ST- segment elevation acute coronary syndrome (NSTEACS)/PCI, a total of approximately 473 cases were collected. The study groups were compared in terms of in-hospital and long-term cardiovascular events as well as other clinical outcomes. Results: A comparison of hospital and long-term events between the CABG group and the control group demonstrated a significant difference only in cases of recurrent myocardial infarction (MI)/ACS in long-term events (P=0.001). Additionally, comparing hospital and long-term events in the CABG group and the STEACS/NSTEACS control group revealed a significant difference only in cases of recurrent MI/ACS in long-term events (P=0.05). Conclusion: Patients with a history of CABG may face a higher risk of cardiovascular events, especially in recurrent MI/ACS. A thorough examination and closer monitoring of this patient group are needed to ensure improvement and mitigate the risks associated with potential complications arising from previous CABG surgeries.