Table 4.

Composite Acid-Base Status of Study Groups

		Time (Hours)
BMI Class	Parameter	0–6	7–12	13–18	19–24	24–48
Normal	pH	7.24	7.34	7.38	7.40	7.38
	pCO2	39	38	38	39	40
	pCO2 Exp	34	38	41	43	44
	HCO3	17	20	22	23	24
	Acidosis	Mixed	Metabolic	None	None	None
Overweight	pH	7.22	7.32	7.37	7.39	7.37
	pCO2	41	40	40	39	42
	pCO2 Exp	34	38	41	43	44
	HCO3	17	20	22	23	24
	Acidosis	Mixed	Metabolic	None	None	None
Obese	pH	7.22	7.31	7.36	7.37	7.37
	pCO2	43	40	40	40	42
	pCO2 Exp	34	38	41	43	44
	HCO3	17	20	22	23	24
	Acidosis	Mixed	Metabolic	None	None	None
Morbid	pH	7.21	7.30	7.34	7.33	7.33
	pCO2	45	41	40	42	44
	pCO2 Exp	35	38	39	43	43
	HCO3	18	20	21	23	23
	Acidosis	Mixed	Metabolic	Metabolic	Metabolic	Metabolic