Sonographic features of umbilical vein recanalization for a Rex shunt on cavernous transformation of portal vein in children

Table 1 Patency of the bypass vessels

Group	Time	Thrombosis	Patency	P value
I	At 7 d after operation	40.0% (6/15)	60.0% (9/15)	0.032
II		12.5% (4/32)	87.5% (28/32)
I	At 3 mo after operation	13.3% (2/15)	86.7% (13/15)	0.642
II		9.4% (3/32)	90.6% (29/32)

Table 2 Intraoperative and postoperative measurement of the inner diameter and flow velocity of bypass vessels

Time	Inner diameter in mm		Flow velocity in cm/s
	Group I	Group II	Group I	Group II
During operation	5.01 ± 0.71	5.13 ± 0.32	14.81 ± 2.40	15.21 ± 1.83
At 3 mo after operation	5.47 ± 0.56	5.40 ± 0.56	16.85 ± 2.75	16.57 ± 2.61
P value	0.038	0.042	0.015	0.046

Table 3 Intraoperative and postoperative measurement of the inner diameter and flow velocity of the sagittal part of the left portal vein

Time	Inner diameter in mm		Flow velocity in cm/s
	Group I	Group II	Group I	Group II
During operation	2.56 ± 0.43	2.42 ± 0.38	10.12 ± 2.37	9.73 ± 1.98
At 3 mo after operation	3.64 ± 0.57	3.70 ± 0.73	13.41 ± 1.89	13.12 ± 2.41
P value	0.000	0.000	0.000	0.000

Table 4 Incidence of the inner diameter widening and flow velocity increase of bypass vessels and left portal vein

Outcome	Group I	Group II	P value
Incidence of inner diameter widening of bypass vessels	80.0 (12/15)	84.3 (27/32)	1.000
Incidence of flow velocity increase of bypass vessels	66.7 (10/15)	71.9 (23/32)	0.983
Incidence of inner diameter widening of left portal vein	80.0 (12/15)	87.5 (28/32)	0.664
Incidence of flow velocity increase of left portal vein	73.3 (11/15)	78.1 (25/32)	1.000