Table 2

Flow measurements at baseline and following external ventilation in Fontan subjects and controls

CMR flows (L/min/m²)	Baseline	Post-NPV	P value	Post-BPV	P value
Fontan subjects (n=10)
SVC	0.72 (0.55–0.93)	0.75 (0.59–0.90)	0.652	0.80 (0.74–1.04)	0.106
Fontan	1.75 (1.67–2.07)	1.99 (1.88–2.47)	0.049	2.36 (1.81–3.02)	0.002
Sub-IVC	0.99 (0.80–1.37)	1.16 (0.91–1.48)	0.106	1.37 (0.88–1.80)	0.027
HV	0.81 (0.62–1.03)	0.96 (0.85–1.04)	0.160	1.06 (0.84–1.42)	0.049
PoV	0.51 (0.37–0.60)	0.53 (0.45–0.75)	0.129	0.55 (0.42–0.60)	0.432
PBF	2.48 (2.33–2.99)	2.88 (2.51–3.55)	0.037	3.08 (2.70–3.76)	0.002
CO	2.88 (2.28–3.35)	2.82 (2.55–3.47)	0.432	3.28 (2.81–3.72)	0.010
Controls (n=10)
SVC	1.05 (0.97–1.15)	1.10 (0.92–1.17)	0.770	1.01 (0.90–1.15)	0.426
Sup-IVC	2.10 (1.97–2.38)	2.06 (1.68–2.30)	0.156	2.19 (1.77–2.47)	0.557
Sub-IVC	1.33 (1.17–1.47)	1.42 (1.18–1.60)	0.770	1.39 (1.22–1.64)	0.573
HV	0.79 (0.74–1.03)	0.64 (0.57–0.96)	0.065	0.87 (0.72–1.07)	0.570
PoV	0.59 (0.51–0.78)	0.63 (0.54–0.78)	0.557	0.51 (0.48–0.64)	0.275
PBF	3.37 (3.09–3.81)	3.32 (2.86–3.68)	0.232	2.97 (2.64–3.57)	0.084
CO	2.97 (2.76–3.42)	3.23 (2.78–3.43)	0.846	3.13 (2.76–3.45)	1.000

Data expressed as median (IQR).
Bolded figures are statistically significant to p<0.05
BPV, biphasic ventilation; CMR, cardiovascular magnetic resonance; CO, cardiac output; HV, hepatic vein; NPV, negative pressure ventilation; PBF, pulmonary blood flow; PoV, portal vein; Sub-IVC, subhepatic inferior vena cava; Sup-IVC, suprahepatic inferior vena cava; SVC, superior vena cava.