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Ann Thorac Surg 1999;67:345-349
© 1999 The Society of Thoracic Surgeons

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Original Articles

Clinical and hemodynamic performance of the freestyle aortic root bioprosthesis

^a Department of Cardiac Surgery, Laval Hospital, Ste-Foy, Quebec, Canada

Address reprint requests to Dr Cartier, Department of Cardiac Surgery, Laval Hospital, 2725 chemin Ste-Foy, Ste-Foy, PQ G1V 4G5, Canada

Presented at the Thirty-fourth Annual Meeting of The Society of Thoracic Surgeons, New Orleans, LA, Jan 26–28, 1998.

Background. The objective of this study is to assess the clinical and hemodynamic performance of a stentless porcine bioprosthesis, the Freestyle aortic root bioprosthesis.

Methods. Consenting patients requiring isolated aortic valve or aortic root replacement received the Freestyle bioprosthesis. Clinical follow-up and echocardiographic data were obtained at discharge, 3 to 6 months, 1 year, and annually thereafter.

Results. Two hundred seventy-six patients received a Freestyle aortic root bioprosthesis between January 1993 and July 1997. The mean age was 67.7 years. Preoperatively, 86.3% were either New York Heart Association class III or IV. Two hundred thirty-eight patients underwent valve (subcoronary) replacement, 36 underwent aortic root replacement, and 2 underwent valve replacement using the root-inclusion technique. The early mortality was 5.4%, with 3.3% mortality for the subcoronary technique and 19.4% mortality for aortic root replacement. The mean gradient decreased significantly between discharge and the 3- to 6-month follow-up and stabilized thereafter. The effective orifice area increased significantly from discharge to 3 to 6 months’ follow-up. At 3 years, 84.4% of the patients had either no or trivial regurgitation.

Conclusions. The Freestyle bioprosthesis has good clinical performance and good short-term hemodynamic performance. The majority of the regurgitation identified is not clinically significant.

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