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Diagram of the balloon-expandable transcatheter heart valve (THV) in regard to the coronary ostia. (a) Supra-ostial position of the THV (superior border of the stent frame above the lowest coronary artery ostia). (b) THV at the ostial level (superior border of the stent frame at the same level as the lowest coronary artery ostia). (c) Infra-ostial position of the THV (superior border of the stent frame below the lowest coronary artery ostia).
