Unprotected Left Main Revascularization in the Setting of Non-coronary Atherosclerosis: Gulf Left Main Registry

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Atherosclerosis Research

Background:

• Left main coronary artery (LMCA) disease revascularization often involves percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG).
• The impact of co-existing non-coronary atherosclerosis (NCA) on LMCA revascularization outcomes is not well-established.
• Understanding this relationship is crucial for optimizing treatment strategies in complex cardiovascular patients.

Purpose of the Study:

• To investigate the relationship between non-coronary atherosclerosis (NCA) and clinical outcomes following unprotected left main coronary artery (LMCA) disease revascularization.
• To compare the efficacy and safety of percutaneous coronary intervention (PCI) versus coronary artery bypass grafting (CABG) in patients with and without NCA undergoing LMCA revascularization.

Main Methods:

• Retrospective analysis of the Gulf-LM study, including 2138 patients undergoing unprotected LMCA revascularization (PCI with second-generation drug-eluting stents vs. CABG) across 14 centers.
• Patients were stratified into two groups: 381 with co-existing NCA and 1757 without NCA.
• Outcomes assessed included major adverse cardiovascular and cerebrovascular events (MACCE), cardiac/non-cardiac death, and bleeding events, with a median follow-up of 15 months.

Main Results:

• In patients with NCA, PCI was the predominant revascularization strategy, associated with a higher incidence of prior myocardial infarction and congestive heart failure.
• PCI demonstrated a statistically significant reduction in in-hospital MACCE and all bleeding compared to CABG in patients with NCA.
• At 15-month follow-up, PCI continued to show favorable outcomes for MACCE and major bleeding in the NCA group; however, no significant differences were observed between PCI and CABG in patients without NCA.

Conclusions:

• Percutaneous coronary intervention (PCI) offers superior clinical outcomes in terms of major adverse cardiovascular and cerebrovascular events (MACCE) and bleeding for unprotected left main coronary artery (LMCA) disease patients with co-existing non-coronary atherosclerosis (NCA).
• The choice of revascularization strategy (PCI vs. CABG) for unprotected LMCA disease does not appear to significantly impact outcomes in patients without concomitant NCA.
• These findings suggest that PCI may be a preferred revascularization option for LMCA disease in patients with co-existing NCA.