Sorin Allcarbon (Tilting disc) 27 mm
Peak gradient:	13 ± 2 mmHg
Mean gradient:	4 ± 1 mmHg
Peak velocity:	1.8 ± 0.1 m/s
Pressure half-time:	89 ± 14 ms
Effective orifice area:	2.5 ± 0.5 cm2