Table 4 Arterial blood gases at baseline zero end-expiratory pressure and end ^a

From: Biphasic positive airway pressure minimizes biological impact on lung tissue in mild acute lung injury independent of etiology

	ALI_p				ALI_exp
Arterial blood gases	PCV	BIVENT-100	BIVENT-75	BIVENT-50	PCV	BIVENT-100	BIVENT-75	BIVENT-50
Baseline ZEEP
PaO₂ (mmHg)	177.5 ± 42.3	153.0 ± 39.2	162.0 ± 46.7	227.0 ± 56.6	149.7 ± 15.8	169.5 ± 31.8	181.8 ± 28.4	174.5 ± 26.5
PaCO₂ (mmHg)	41.7 ± 5.1	42.0 ± 2.9	47.7 ± 2.3	42.2 ± 1.9	50.2 ± 6.6	43.4 ± 2.7	44.2 ± 3.2	42.1 ± 2.9
pH_a	7.27 ± 0.03	7.31 ± 0.02	7.29 ± 0.02	7.30 ± 0.03	7.20 ± 0.03	7.27 ± 0.02	7.24 ± 0.04	7.29 ± 0.04
End
PaO₂ (mmHg)	457.7 ± 35.6	458.8 ± 16.9	410.5 ± 53.1	456.2 ± 35.3	393.7 ± 30.4	350.8 ± 20.9	395.8 ± 23.7	381.3 ± 7.6
PaCO₂ (mmHg)	37.8 ± 5.1	43.1 ± 2.5	44.2 ± 4.3	41.8 ± 1.0	44.1 ± 1.6	43.2 ± 1.5	47.5 ± 3.9	48.4 ± 2.0
pH_a	7.27 ± 0.03	7.31 ± 0.03	7.24 ± 0.05	7.29 ± 0.02	7.21 ± 0.02	7.20 ± 0.03	7.26 ± 0.04	7.27 ± 0.03

^aALI_exp: extrapulmonary acute lung injury; ALI_p: pulmonary acute lung injury; BIVENT: biphasic positive airway pressure at different rates of time-cycled controlled breaths: 100, 75 and 50 breaths/min; PaO₂: partial pressure of arterial oxygen; PaCO₂: partial pressure of arterial carbon dioxide; PCV: pressure-controlled ventilation;, pH_a: arterial pH; ZEEP: zero end-expiratory pressure. PaO₂, PaCO₂ and pH_a were measured at baseline ZEEP and after one hour of mechanical ventilation at a fraction of inspired oxygen = 1.0 in animals with ALI_p and ALI_exp. Values are means ± SEM of six rats.

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