A cardiac valve prosthetic effective for use in a living mammalian heart without inducing atrial fibrillation. A plurality of valve leaflets is internally disposed in a radially, compressible stent frame. A tubular valve portion is connected to a tubular inferior skirt portion to form the stent frame. Optionally, a superior portion is fluidly connected to the valve portion. An asymmetrical bottom edge of the inferior skirt portion is formed by an upper edge section interconnected to a lower edge section. A first distance between the upper edge section and a top edge of the valve portion is shorter that a second distance between the lower edge section and the top edge of the valve portion.
