Unprotected Left Main Coronary Artery Disease: Management in the Post NOBLE and EXCEL Era

Area of Science:

• Cardiovascular Medicine
• Interventional Cardiology
• Cardiac Surgery

Background:

• Optimal management for unprotected left main coronary artery (ULMCA) disease remains debated.
• Percutaneous coronary intervention (PCI) adoption has increased for ULMCA disease, supported by trials showing equipoise with coronary artery bypass grafting (CABG) in low-complexity lesions.
• Recent large-scale trials like NOBLE and EXCEL provide critical data comparing PCI and CABG for ULMCA disease.

Purpose of the Study:

• To compare the efficacy and safety of PCI versus CABG in patients with ULMCA disease.
• To evaluate mortality outcomes between PCI and CABG in the context of ULMCA disease management.
• To identify patient subgroups and lesion characteristics where PCI or CABG may be preferred.

Main Methods:

• Analysis of data from large international randomized clinical trials (e.g., NOBLE, EXCEL) comparing PCI and CABG.
• Assessment of mortality as a primary endpoint.
• Stratification of results based on patient comorbidities (e.g., diabetes) and coronary lesion complexity (e.g., SYNTAX score).

Main Results:

• PCI demonstrates equivalent mortality rates to CABG in patients with ULMCA disease.
• For non-diabetic patients with low complexity coronary disease (SYNTAX score ≤32), PCI is a reasonable alternative to CABG, particularly for ostial and midshaft lesions.
• CABG is recommended for patients with diabetes, multivessel disease alongside ULMCA, or complex lesions (SYNTAX score >33), including distal left main lesions.

Conclusions:

• PCI and CABG show comparable mortality for ULMCA disease.
• PCI is a suitable option for select ULMCA patients with low SYNTAX scores and without diabetes.
• CABG remains the preferred revascularization strategy for complex ULMCA disease, diabetes, or multivessel involvement.