Table 2.

Evaluation of ventilator-sharing system (VSS) in benchtop testing using two test lungs under volume control mode.

				Simulated patient 1					Simulated patient 2					Simulated patient 1		Simulated patient 2
PB-840 VC settings				Test lung		VSS setting	NM3 measurements		Test lung		VSS setting	NM3 measurements		Error Vt	%Error Vt	Error Vt	%Error Vt
IP	PEEP	Ti	RR	Crs	R	Vt	PEEP	Vt	Crs	R	Vt	PEEP	Vt
22	10	1.25	24	25	5	300	9.4	297	25	5	500	9.8	503	−3	1.0%	3	0.6%
22	10	1.25	24	25	5	300	10.8	303	50	20	720	16	718	3	1.0%	−2	0.3%
22	10	1.25	24	25	20	300	10	302	25	20	500	10.8	500	2	0.7%	0	0.0%
22	10	1.25	24	25	20	300	10.6	296	50	5	720	13.7	727	−4	1.3%	7	1.0%
22	10	1.25	24	50	5	300	12.4	308	50	5	720	13.6	721	8	2.7%	1	0.1%
22	10	1.25	24	50	5	300	11	293	25	20	500	10.7	502	−7	2.3%	2	0.4%
26	10	1.25	24	50	20	300	12.5	291	50	20	720	16.2	712	−9	3.0%	−8	1.1%
26	10	1.25	24	50	20	300	11.8	302	25	5	500	10.4	501	2	0.7%	1	0.2%
22	10	1.25	12	25	5	300	9.7	298	25	5	500	10.1	498	−2	0.7%	−2	0.4%
22	10	1.25	12	25	5	300	9.6	308	50	20	720	10.1	722	8	2.7%	2	0.3%
22	10	1.25	12	25	20	300	9.7	299	25	20	500	10.1	500	−1	0.3%	0	0.0%
22	10	1.25	12	25	20	300	9.8	296	50	5	720	10.3	728	−4	1.3%	8	1.1%
22	10	1.25	12	50	5	300	9.7	303	50	5	720	10.1	715	3	1.0%	−5	0.7%
22	10	1.25	12	50	5	300	9.6	301	25	20	500	10.1	498	1	0.3%	−2	0.4%
22	10	1.25	12	50	20	300	9.6	298	50	20	720	10.1	718	−2	0.7%	−2	0.3%
22	10	1.25	12	50	20	300	9.8	301	25	5	500	10.2	498	1	0.3%	−2	0.4%
												Mean		−0.25		0.06
												Stdev		4.73		4.01
												Absolute mean % error			1.3%		0.5%

VC = volume control ventilation mode; IP = inspiratory pressure (cmH₂O); PEEP = positive end expiratory pressure (cmH₂O); T_i = inspiratory time (s); RR = respiratory rate (breaths per minute, bpm); Crs = dynamic compliance (mL/cmH₂O); R = resistance (cmH₂O/L/s); V_t = tidal volume (mL); stdev = standard deviation.