Table 2.

Serial blood gases

Hour	0	1	4	6	10	24	60
pH	7.057	7.001	7.063	7.114	7.25	7.40	7.42
PaO2 mmHg	166.9	109.5	65.0	72	70	87.0	65
PaCO2 mmHg	148	150	112	80	60	47.6	50
HCO3 mmHg	34	35	33	31	30	28	29
BE	−3.6	−4.1	−4.3	−4.0	−3	4.4	4.1
K+	6.5	-	6.5		6.2	3.4	2.9

Noninvasive ventilation started at 0 hr. IV started by 1 hr. Cardiac arrest at 8 hr. Weaning started by 30 hrs. First phlebotomy at 40 hrs, extubation at 50 hrs