Intraoperative Trifecta Valve Malfunction.

Trifecta valve has been reported to have valve dysfunction months to years after operation, However, there was no reports of intraoperative valve dysfunction. A 73-year-old man with aortic stenosis underwent aortic valve replacement using a 21-mm Trifecta valve GT. Hemodynamics was collapsed after aortic declamp because of severe regurgitation. We forced to replace another biological valve. We noticed that the removed valve's mount post was open outward more than usual. Despite the progress of the biological valve, dysfunction like this case can occur during operation and it should re-operate immediately even if there is no obvious tear or deformity.