Correlation between ductus venosus spectrum and right ventricular diastolic function in isolated single-umbilical-artery foetus and normal foetus in third trimester

Table 1 Comparison of the measured foetal ductus venosus blood flow velocities and velocity ratios between the two groups, mean ± SD

	Isolated SUA group	Control group	P value
S, cm/s	32.8 ± 14.0	34.9 ± 14.3	0.552
v, cm/s	22.6 ± 9.4	24.1 ± 9.8	0.508
D, cm/s	26.7 ± 12.0	28.2 ± 11.6	0.600
a, cm/s	13.0 ± 7.1	17.5 ± 7.4	0.013
PIV	0.81 ± 0.33	0.73 ± 0.34	0.310
S/v	1.48 ± 0.30	1.47 ± 0.30	0.816
S/D	1.26 ± 0.20	1.24 ± 0.15	0.778
S/a	2.37 ± 0.79	2.13 ± 0.77	0.214
v/D	0.86 ± 0.71	0.86 ± 0.75	0.921
v/a	1.61 ± 0.48	1.44 ± 0.41	0.126
D/a	1.90 ± 0.60	1.70 ± 0.53	0.163
E/A	0.64 ± 0.13	0.64 ± 0.10	0.975

a: Atrial systolic peak velocity; A: Late active; E: Early passive; D: Ventricular diastolic peak flow velocity; PIV: Pulsatility index for veins; S: Ventricular systolic peak flow velocity; SUA: Single umbilical artery; v: Ventricular late diastolic velocity.