The hemodynamic performance of two supraannular aortic xenografts (Trifecta, St. Jude Medical
and Perimount Magna Ease, Edwards Lifescience) will be compared using rest- and stress
echocardiography in a randomized prospective study. Furthermore, the prostheses' influence on
postoperative outcome will be compared using spiroergometry, quality of life questionnaire
and heart failure biomarkers.