Table 3.

Changes of bypass diameter and flow velocity at 7 days and 6 months after operation in Group A

	7 days	6 months	t	P
Diameter (cm)	0.518 ± 0.084	0.602 ± 0.099	7.040	< 0.001
Velocity (cm/s)	12.956 ± 2.402	13.084 ± 2.62	0.669	0.507