Figure 2.

Mechanisms and theoretical indications of the balloon block and support technique (BBST). A, B: In cases with severe angulation of greater than 70° between the distal main branch (DMB) and side branch (SB) (A), and cases with heavy plaque burden or significant stenosis in the proximal main branch (PMB) near the SB ostium (SBO) (B), balloon inflation provides upward support for the guide wire by blocking the DMB pathway and facilitating guide wire advancement into the SB. C: DMB wiring in Medina 1,1,1 with the balloon placed in the SB.