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Surgeons are now facing the challenge of redo valve surgery because of the increasing number of elderly individuals in Japan. The incidence of bioprosthesis dysfunction has increased among the various surgical indications of redo valve surgery due to the preference of patients and a paradigm shift in prostheses from mechanical valves to bioprostheses. Previous studies reported that the clinical outcomes of reoperative valvular surgery have markedly improved due to the maneuver of myocardialdoi:10.5761/atcs.ra.13-00380 pmid:25142755 fatcat:2mttutpd4ff3lgbtx2ncbluxhi