Dynamic obstruction, an unusual complication after aortic valve replacement with a stentless porcine valve

In the early nineties, the stentless porcine aortic bioprosthesis has been reintroduced successfully. Because of the limited experience, knowledge of clinical complications is limited. Therefore, we describe an unusual compli cation of dynamic obstruction after aortic valve replacement with a stentle ss porcine valve in a 70 year old man 18 months after implantation. We disc uss the complications of stentless aortic prostheses known so far, describe operative techniques used and their characteristic two dimensional echocar diographic images.