Table 3.

Simulation Results of BDG and ABG at Low and High PVR, With Varying Shunt Geometry

	Low PVR						High PVR
		ABG^a						ABG^a
Variable	BDG	i	ii	iii	iv	v	BDG	i	ii	iii	iv	v
PVR, WU-m²	3.32	3.29	3.23	3.16	3.22	3.23	6.22	6.18	6.05	5.91	6.03	6.06
P_ao, mm Hg	58.5	59.1	56.4	52.6	56.3	57.2	54.3	54.9	52.3	48.6	52.1	53.0
P_sys, mm Hg	79.6	81.2	79.1	76.0	78.9	79.8	73.0	74.3	72.0	68.6	71.8	72.6
P_pulm, mm Hg	11.6	12.7	13.7	15.2	13.7	13.4	15.1	16.4	17.7	19.6	17.8	17.3
P_svc, mm Hg	12.7	13.7	15.2	16.9	15.1	14.8	15.9	17.2	18.8	20.8	18.8	18.4
CO, L/min	1.08	1.13	1.17	1.24	1.18	1.16	0.924	0.968	0.995	1.03	0.996	0.987
Q_s, L/min	1.08	1.06	0.970	0.837	0.965	0.996	0.924	0.911	0.813	0.682	0.809	0.841
Q_p, L/min	0.606	0.644	0.750	0.878	0.758	0.728	0.517	0.566	0.635	0.731	0.640	0.616
Q_shunt, L/min		0.063	0.202	0.400	0.211	0.163		0.057	0.181	0.350	0.188	0.146
Q_p/Q_s	0.563	0.625	0.774	1.05	0.786	0.730	0.560	0.621	0.781	1.07	0.791	0.732
HL, Nm/min	10.1	10.8	10.9	11.0	10.9	10.9	7.92	8.45	8.37	8.24	8.37	8.39
OD, mL/s	3.17	3.21	2.99	2.66	2.98	3.06	2.61	2.64	2.43	2.09	2.42	2.49
Sat_ao, %	78.7	80.4	82.4	84.7	82.6	82.0	75.4	77.4	79.6	82.0	79.8	79.0

The ABG shunt was 3.5 mm in diameter with (i) 0.6-mm circular nozzle, (ii) 1.2-mm circular nozzle (baseline), (iii) 1.8-mm circular nozzle, (iv) 1.2-mm elliptical nozzle, and (v) 1.2-mm circular nozzle anastomosed to the superior vena cava–pulmonary junction.

ABG = assisted bidirectional Glenn; BDG = bidirectional Glenn; CO = mean cardiac output; HL = ventricular load; OD = systemic oxygen delivery; P_ao = aortic average pressure; P_pulm = mean pulmonary artery pressure; P_svc = superior vena caval average pressure; P_sys = systolic average pressure; PVR = pulmonary vascular resistance; Q_p = pulmonary flow rate; Q_s = systemic flow rate; Q_p/Q_s = pulmonary to systemic flow ratio; Q_shunt = flow rate through the ABG shunt; Sat_ao = oxygen saturation in the aorta.