Fig. 1.
Top, angiographically guided stent implantation. Despite acceptable angiographic appearance (A), IVUS demonstrates underdeployment, achieving MSA of only 5.61 mm2 (B) Compared with proximal reference segment of 10.40 mm2 (C). Bottom, both angiographically and IVUS-guided stent implantation. Angiogram after stent deployment in mid right coronary artery with 3.5-mm balloon inflated at 16 atm shows acceptable result (A). Initial IVUS (B) shows underdeployment. IVUS image after further dilatation with 4.0-mm balloon at 16 atm demonstrates substantial improvement in MSA (C).13 IVUS, intravascular ultrasound; MSA, minimal stent area.