Where is the saphenous vein graft to the circumflex or obtuse marginal arteries typically located?

• A. Typically highest on the ascending aorta above the LAD graft
• B. Typically lowest on the ascending aorta directly above the RCA ostium
• C. Typically midway on the ascending aorta near the left coronary ostium
• D. Located on the descending aorta

Answer: (A)

When performing CABG with saphenous vein grafts, proximal connections to the ascending aorta are arranged in a superior-to-inferior pattern to optimize graft length and flow. For grafts aimed at the circumflex or obtuse marginal arteries, the best, most favorable path is achieved by attaching the graft at the highest available point on the ascending aorta, above where the LAD graft is placed. This high position provides a direct, tension-free route to the lateral left ventricular territory and helps avoid crowding or kinking with other grafts.

The other locations are less practical: the mounting point on the descending aorta isn’t used for these proximal anastomoses, and placing the graft directly above the RCA ostium or midway near the left coronary ostium doesn’t accommodate the typical graft trajectory to the circumflex/OM arteries.