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We herein report two cases of very high CAO risk where this technique was successfully used during last-generation self-expandable prostheses implantation (in a native aortic valve and in one prosthetic aortic valve). In conclusion, this "orthotopic snorkel-stenting in TAVR" (OST) technique represents a novel option for treating impeding CAO during TAVR. As compared with the "classic" snorkel technique, it allows avoiding stent implantation in some patients (who do not experience CAO) and may provide a more predictable and physiologic T