Stent vs CABG Decision Calculator

The left main coronary artery supplies the large majority of the left ventricle in most people, so a significant blockage there puts a disproportionate amount of heart muscle at risk compared to a similarly sized blockage in a smaller branch vessel. Historically, left main disease was considered close to an automatic indication for CABG, though newer trial data has shown PCI can be reasonable for left main disease with lower anatomical complexity, which is reflected in this calculator's "either reasonable" recommendation at low overall complexity even with left main involvement.

A chronic total occlusion (CTO) is a vessel that has been 100% blocked for an extended period, and successfully opening one with a stent is technically demanding -- the wire has to cross old, often calcified, organized blockage tissue rather than a recently formed clot or plaque, with a meaningfully higher procedural failure rate than non-occluded lesions. That technical difficulty and lower success rate is why CTOs carry a substantial complexity weight in both the real SYNTAX score and this simplified estimate.

A low SYNTAX score (0-22) means the SYNTAX trial found broadly comparable outcomes between PCI and CABG for that complexity level, not that PCI is definitively superior -- the actual choice at low complexity typically comes down to other factors like diabetes status, patient preference regarding a percutaneous versus surgical procedure, and surgical risk, which the score alone does not capture. At this calculator's defaults (low complexity, no left main involvement) it returns "PCI favored" rather than "either reasonable" -- PCI is a reasonable first choice at low complexity when left main disease is absent, while the "either reasonable" recommendation is reserved for low-complexity cases that also involve the left main, where the added risk of that location argues for a more deliberate case-by-case discussion even though overall SYNTAX-trial outcomes were still comparable between the two approaches.

Major adverse cardiac and cerebrovascular events (MACCE) -- death, stroke, heart attack, or repeat revascularization combined -- and repeat revascularization rate alone tell a different part of the outcome story: PCI has historically shown a higher rate of needing a repeat procedure even in scenarios where overall MACCE rates are similar to CABG, because stented segments can re-narrow (restenosis) or new lesions can progress elsewhere. Reporting them separately lets a patient see that specific trade-off rather than a single blended number that could obscure it.