The assessment of mechanical heart valves stenosis in adults after aortic valve replacement: The advantage of full-flow design of mechanical valve

Abstract

The analysis of transprosthetic hemodynamics in adults after aortic valve replacement in the Bakoulev Center for Cardiovascular Surgery in 2007-2010 demonstrated the hemodynamic advantage of the concept of new full-flow mechanical aortic valve prosthesis «CorBeat». Having the same size of internal orifice and tissue annulus diameters, the values of transprosthetic parameters (peak and mean gradients, blood flow velocities) through «CorBeat» were close to physiological values of transvalvular native aortic parameters and had a tendency to be not dependent on the size of prosthesis (p =0,63). In the article for the first time a morphometric database of geometric values of internal orifice area of normal native aortic valves in adults was used taking into account both the gender and the body surface area 'sofa patient. There was also used the standardized prosthesis size Z-score which represents the number of SDs by which the internal prosthesis area differs from the mean normal native aortic valve area for the patient's body surface area. The article emphasizes the need of the personal selection of the size and the type of prosthesis for any patient as well as the needfor new design development of prosthetic heart valves.