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The Euro-ASA registry demonstrated low peri-procedural and long-term mortality after ASA. This intervention provided durable relief of symptoms and a reduction of LV outflow tract obstruction in selected and highly symptomatic patients with obstructive HCM. As the post-procedural obstruction seems to be associated with both worse functional status and prognosis, optimal therapy should be focused on the elimination of LV outflow tract gradient.

In our randomized trial we failed to demonstrate the superiority of the IVUS guidance during DES implantation over standard high-pressure postdilatation. However we confirmed worrisome results concerning DES thrombosis after discontinuation of dual antiplatelet-treatment with documented stent thrombosis related events in almost 5% of patients with 50% of mortality in this high-risk clinical scenario.

This study suggests that in patients with HOCM and important symptoms who underwent ASA, long-term survival after the procedure did not differ significantly from that of the general population.