Aortic Root Surgery in Connective Tissue Conditions - Surgery Series (2/10/21) 1:00:10-1:02:04 Q:I know you talked about the different types of valves what's the lifespan of the different valve type, what lasts the longest and what would you select? 人工弁には様々な種類があるようですが、耐久性など詳細を教えて下さい。 A:So mechanical…