“…In contrast to surgical double-valve replacement, for STVR, the aortic valve is replaced first. This allows the ventricle to have a lower pressure and enables it to handle the increased blood volume after mitral valve replacement for MS. 18 In addition, since the aortic and mitral annuli are contiguous, bridged by the aortomitral fibrous curtain, some degree of obstruction could happen during the new aortic THV deployment if the mitral had been treated first. 19 …”