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The present report describes the hemodynamic findings from a multinational, multicenter study following implantation of the Toronto SPA ( R) stentless porcine valve. Between 7/91 and 1/97, 577 patients underwent implantation at 12 centers in 3 countries. Echocardiography was performed before hospital discharge (n = 524), at 3-6 (n = 467), 12 (n = 411), 24 (n = 277) and 36 (n = 166) months...