A prosthetic heart valve comprising: a frame that is expandable between a crimped configuration and an expanded configuration; and a valvular structure comprising a plurality of leaflets, each leaflet having a pair of tabs, the tabs of the pair being on opposite sides from each other with respect to a centerline of the leaflet, the valvular structure having a plurality of commissure tab assemblies formed by paired tabs of adjacent leaflets, the valvular structure being coupled to the frame via the plurality of commissure tab assemblies; wherein the frame has an inflow end and an outflow end separated from the inflow end along an axial direction of the frame, the inflow end of the frame having a first diameter in the crimped configuration and a second diameter (D i, D 2) greater than the first diameter in the expanded configuration, the outflow end of the frame having a third diameter in the crimped configuration and a fourth diameter (D o, D 1) greater than the third diameter in the expanded configuration, wherein the frame in the expanded configuration has an inverted frustoconical shape, with the fourth diameter (D o, D 1) of the outflow end being greater than the second diameter (D i, D 2) of the inflow end, wherein a taper angle of the inverted frustoconical shape of the frame in the expanded configuration is within a range of 6-8°, wherein the frame in the expanded configuration has a height along the axial direction from the inflow end to the outflow end, wherein a ratio of the height of the frame in the expanded configuration to the second diameter (Di, D 2) of the inflow end is within a range of 0.63-0.9, wherein the valvular structure is constructed to transition between a closed configuration, where the leaflets prevent blood flow from the inflow end to the outflow end of the frame, and an open configuration, where the leaflets deflect away from a central axis of the frame to form a flow channel from the inflow end to the outflow end of the frame, and wherein the flow channel formed by the valvular structure in the open configuration is tapered such that a cross-sectional area at an outlet of the flow channel is greater than a cross-sectional area at an inlet of the flow channel. a frame that is expandable between a crimped configuration and an expanded configuration; and a valvular structure comprising a plurality of leaflets, each leaflet having a pair of tabs, the tabs of the pair being on opposite sides from each other with respect to a centerline of the leaflet, the valvular structure having a plurality of commissure tab assemblies formed by paired tabs of adjacent leaflets, the valvular structure being coupled to the frame via the plurality of commissure tab assemblies; wherein the frame has an inflow end and an outflow end separated from the inflow end along an axial direction of the frame, the inflow end of the frame having a first diameter in the crimped configuration and a second diameter (D i, D 2) greater than the first diameter in the expanded configuration, the outflow end of the frame having a third diameter in the crimped configuration and a fourth diameter (D o, D 1) greater than the third diameter in the expanded configuration, wherein the frame in the expanded configuration has an inverted frustoconical shape, with the fourth diameter (D o, D 1) of the outflow end being greater than the second diameter (D i, D 2) of the inflow end, wherein a taper angle of the inverted frustoconical shape of the frame in the expanded configuration is within a range of 6-8°, wherein the frame in the expanded configuration has a height along the axial direction from the inflow end to the outflow end, wherein a ratio of the height of the frame in the expanded configuration to the second diameter (Di, D 2) of the inflow end is within a range of 0.63-0.9, wherein the valvular structure is constructed to transition between a closed configuration, where the leaflets prevent blood flow from the inflow end to the outflow end of the frame, and an open configuration, where the leaflets deflect away from a central axis of the frame to form a flow channel from the inflow end to the outflow end of the frame, and wherein the flow channel formed by the valvular structure in the open configuration is tapered such that a cross-sectional area at an outlet of the flow channel is greater than a cross-sectional area at an inlet of the flow channel.