Intravascular Lithotripsy for Vessel Preparation in Calcified Coronary Arteries Prior to Stent Placement　― Japanese Disrupt CAD IV Study 1-Year Results ―

Background: Intravascular lithotripsy (IVL) delivers acoustic pressure waves to modify calcium, enhance vessel compliance, and optimize stent deployment. The Disrupt CAD IV study enrolled patients with severe coronary artery calcification and demonstrated low 30-day major adverse cardiovascular events (MACE) and high procedural success following IVL with no final serious angiographic complications. To date, long-term outcomes have not been reported. This analysis evaluates 1-year outcomes of Disrupt CAD IV. Methods and Results: Disrupt CAD IV was a prospective single-arm multicenter study of IVL performed in a Japanese population with severe coronary artery calcification. Main outcomes included MACE (a composite of cardiac death, myocardial infarction [MI], or target vessel revascularization [TVR]), and target lesion failure (TLF; a composite of cardiac death, target vessel MI, and target lesion revascularization [TLR]) at 1 year. Compliance with patient follow-up at 1 year was 100%. MACE occurred in 9.4% of patients (cardiac death 0.0%, MI 6.3%, TVR 4.7%) and TLF occurred in 6.3% of patients, with both rates driven by non-Q wave MIs (6.3%). The TLR rate at 1 year was 1.6% and no stent thrombosis events were reported. Conclusions: Treatment of severely calcified coronary lesions with IVL was associated with low rates of 1-year MACE and TLR, suggesting durable safety and effectiveness of IVL-facilitated coronary stent implantation in severely calcified lesions in a Japanese population.