Medtronic's MOSAIC Bioprosthesis Versus Baxter Carpentier-Edwards SAV Porcine Valve

The study compares the clinical performance of the Mosaic valve with that of the Baxter valve (Carpentier-Edwards) which is widely used throughout the UK and is considered to be the "bench mark". Specific objectives will be to determine structural failure and valve explantation rates, thromboembolic events and mortality rates for each valve. Haemodynamic assessments will also be made using echocardiography to measure gradients across the valves and changes in left ventricular function and wall thickness.