|20 mm||23 mm||26 mm||29 mm|
|Nominal area, mm2||314||415||531||661|
|Annular range for second generation balloon-expandable valve, mm2||257–310||298–410||420–530||530–660|
|Annular range for third generation balloon-expandable valve, mm2||273–345||338–430||430–546||540–683|
The nominal areas for each balloon-expandable valve size is listed (in mm2). The ranges of annular areas that can be covered are based on an acceptable oversizing range of 5% to 20% for the second generation balloon-expandable valve, and a −5% to 20% oversizing with the third generation balloon-expandable valve. (Note: a negative oversizing equates to undersizing of the valve, in which the native annulus can be up to 5% larger than the nominal area of the transcatheter valve).