Which technique is sometimes used to optimize side branch flow in bifurcation lesions?

• A. Kissing balloons
• B. Stent first in the side branch
• C. Atherectomy of main vessel
• D. Bypass grafting

Answer: (A)

Kissing balloons are used to optimize flow at bifurcation lesions by simultaneously inflating balloons in the main vessel and the side branch to mold the bifurcation geometry and keep the side-branch ostium open after stent deployment. When a stent covers a bifurcation, the side-branch ostium can become compromised by carina shift or stent struts, reducing flow and risking restenosis. Re-expanding both branches at the bifurcation restores the ostial shape, reduces residual stenosis at the side-branch opening, and helps maintain patency for better immediate and potentially longer-term outcomes. This approach is commonly used after stenting the main vessel and then addressing the side branch, rather than starting with the side branch or pursuing other techniques that don’t specifically optimize the bifurcation geometry.