Role of Lithotripsy for Small Calcified Iliacs in the Era of Big Devices.

Abstract

In recent years, transcatheter aortic valve replacement (TAVR) and percutaneous mechanical circulatory support (MCS) systems have seen a widespread diffusion. These devices require the insertion of large femoral sheaths in a population of patients often presenting with calcific peripheral artery disease. Small and severely calcified iliac vessels are associated with increased risk of vascular complications or strategy changes such as the use of an alternative subclavian or transapical approach for TAVR or a conversion to surgery. Intravascular lithotripsy (IVL) technology applies mechanical pressure waves to modify vessel calcifications. It has been applied both in coronary and peripheral calcific disease with promising results. The use in vessel preparation before the insertion of large sheaths is an emerging application of this device. After case reports and presentations of isolated cases, two multicenter registries collected 42 and 12 patients treated with peripheral IVL before TAVR and MCS insertion. In most cases, the largest balloons were used in the iliac arteries with success achieved directly or using a separate insertion sheath in all cases. Low-pressure dilatation during energy delivery avoided dissections or vessel ruptures with no need of postprocedural stent implantation or emergency surgical repair. IVL can successfully modify the arterial compliance and facilitate transfemoral delivery of TAVR or MCS in patients with calcified iliofemoral vessels, reducing the need for alternative TAVR access routes and allowing to perform high-risk coronary procedures with adequate support.