Elsevier

The Annals of Thoracic Surgery

Volume 68, Issue 6, December 1999, Pages 2342-2344
The Annals of Thoracic Surgery

Case Reports
Transient dysfunction of the freestyle stentless xenograft

https://doi.org/10.1016/S0003-4975(99)00870-XGet rights and content

Abstract

After replacement of a bicuspid aortic valve with a Freestyle stentless xenograft, right coronary leaflet dysfunction and an elevated pressure gradient developed. Attempts to match the right and left ostia of the prosthesis, which were located at an angle of less than 120 degrees, to the native right and left ostia, which were located at 180 degrees, may have resulted in the leaflet distension. This is a suggestive finding about its implantation technique.

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Comment

Because it has no stent or sewing ring, the Freestyle bioprosthesis exhibits an enlarged orifice area and a reduced transvalvular pressure gradient. Early postoperative regression of left ventricular hypertrophy has been reported using this device. Because it is supplied as a complete aortic root, it is possible to modify the implantation technique to deal with a variety of native root conditions [2].

Sintek and colleagues [3] have reported an early postoperative reduction in valve pressure

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