Abstract P73  The mean values and range in the pre- and post-intervention groups (* p>0.05)

	Pre-intervention			Post-intervention
	Initiation	1 hour	6 hours	Initiation	1 hour	6 hours
pH	7.25	7.30	7.34	7.25	7.29	7.36
	6.9–7.36	7.20–7.40	7.26–7.45	7.02–7.36	6.80–7.41	7.25–7.47
Paco2 (kPa)	10.6	9.0	8.0	10.3	9.0	7.8
	7.0–22.3	4.3–17.8	4.9–10.8	5.2–17.3	4.5–20.2	4.4–14.8
Pao2 (kPa)	10.2	9.7	10.5	9.7	8.89	9.06
	6.9–35.5	6.4–34.6	7.1–32.8	3.2–21.9	4.5–17.6	5.9–17.2
HCO3 (m/mol/l)	32.0	29.9	29.8	32.9	32.9	30.7
	20.6–40.9	17.0–43.3	22.6–34.4	21.8–54.0	23.4–45.9	23.0–41.7