Fig. 1.

Baseline coronary angiography in the right oblique caudal projection (a) and the right oblique cranial projection (b). CTO begins from the proximal of LAD to the bifurcation between LAD and diagonal branch (Diag) (arrow). (c) Intravascular ultrasound catheter was inserted in septal branch to identify the entrance of occluded LAD (arrow). (d) Guidewire (Gaia 2nd) advanced close to the end of CTO (arrow). (e) Gaia 2nd passed into diagonal branch.

CTO, Chronic total occlusion; LAD, left anterior descending artery.