TABLE 2

Gas exchange, mechanical ventilation settings and respiratory system mechanics

Subject	P_aO₂/F_IO₂	pH	P_aCO₂ mmHg	Tidal volume mL	Plateau pressure cmH₂O	PEEP cmH₂O	Driving pressure cmH₂O	Respiratory system elastance cmH₂O·L⁻¹	Chest wall elastance cmH₂O·L⁻¹	Elastance ratio
1	60	7.35	40	340	28	12	16	47	7	0.15
2	346	7.26	30	270	21	10	11	41	21	0.51
3	184	7.41	41	334	22	10	12	36	17	0.47
4	388	7.39	35	443	22	8	14	32	8	0.25
5	200	7.29	34	250	27	14	13	52	11	0.21
6	157	7.49	33	383	25	10	15	39	3	0.08
7	65	7.30	50	284	31	15	16	56	9	0.16
8	150	7.30	78	358	26	10	16	44	4	0.09
9	160	7.34	49	417	16	5	11	26	6	0.23
10	90	7.36	39	200	24	10	14	70	18	0.26
11	126	7.30	37	222	26	14	12	54	8	0.15
12	140	7.36	41	321	29	14	15	47	5	0.11
13	225	7.42	32	460	23	14	9	20	12	0.60
14	250	7.38	36	400	25	12	13	32	8	0.25
Mean±sd	181±96	7.35±0.06	41±12	334±81	25±4	11±3	13±2	42±13	10±5	0.25±0.16

P_aO₂: arterial oxygen tension; F_IO₂: inspiratory oxygen fraction; P_aCO₂: arterial carbon dioxide tension; PEEP: positive end-expiratory pressure.