Sorin Allcarbon (Tilting disc) 31 mm
Peak gradient:	9 ± 1 mmHg
Mean gradient:	4 ± 1 mmHg
Peak velocity:	1.6 ± 0.1 m/s
Pressure half-time:	88 ± 27 ms
Effective orifice area:	2.8 ± 0.9 cm2