Abstract 14961: Revitalizing Graft Patency: Intravascular Lithotripsy in Calcified Saphenous Vein Graft to Left Anterior Descending Artery Stenosis

Abstract

A 73-year-old man with coronary artery disease (CAD), coronary artery bypass graft, heart failure [EF 25%] & hypertension presented with Non-ST Segment Myocardial Infarction. Angiography revealed multivessel CAD with chronic total occlusion (CTO) of mid-left anterior descending (LAD) after a large first diagonal branch, CTO of mid-left circumflex & distal right coronary artery. Saphenous vein graft (SVG) to obtuse marginal was patent. SVG-diagonal & SVG-ramus intermedius were occluded. Mid SVG-LAD showed severe calcified stenosis (Fig. 1A). Native LAD beyond the SVG provided left to right collaterals to right posterior descending artery. Complex high-risk coronary intervention was performed on the SVG-LAD with mechanical circulatory support (MCS; Impella CP). SVG-LAD had a balloon undilatable lesion despite high pressure inflation with 4.0 mm cutting balloon (Fig. 1B). Intravascular ultrasound (IVUS) revealed severe stenosis with extensive circumferential calcification (Fig. 1C). Subsequently, intravascular lithotripsy (IVL) with 4.0 mm Shockwave balloon followed by high pressure balloon angioplasty with 4.5 mm noncompliant (NC) balloon was performed with significant luminal gain and fractures in calcium (Fig. 1D). The lesion was treated with 5.0 mm drug eluting stents that were post dilated with 5.0 mm NC balloon with excellent angiographic and IVUS result (Figs. 1E & F). MCS was successfully removed at the end of the case.SVG grafts are associated with poor long-term patency compared to arterial grafts. PCI to SVG has a high failure rate and PCI of native vessel is often preferable. High risk SVG interventions with atherectomy have been recently reported, though data is limited. IVL has been safely used in heavily calcified native coronary arteries, however, its use in SVG disease is rare. We report the first off-label use IVL of SVG-LAD with MCS for treatment of a last-remaining conduit. Additional studies to assess IVL efficacy in vein grafts are warranted.