Mehlman Cardiology Practice Exam 2026 – Comprehensive Test Prep Resource

In the setting of left main coronary artery disease, a single-vessel involvement qualifies for bypass grafting.

Only if the patient is diabetic

Only if revascularization is attempted with PCI

Single-vessel disease involving the left main qualifies for bypass grafting

Left main coronary artery disease carries a high risk because this artery supplies a large portion of the heart muscle. When there is significant stenosis of the left main, revascularization is indicated to restore blood flow. Bypass grafting is often the preferred approach because it provides durable, complete revascularization of the territories supplied by the left main, LAD, and circumflex arteries, and it reduces the need for future procedures. Therefore, even if the disease appears as a single involved vessel, it qualifies for bypass grafting because an isolated left main lesion represents a high‑risk, surgically addressable problem with survival benefits over medical therapy alone in many patients. While PCI can be considered in selected cases, the scenario described aligns with the indication for CABG.