Table 3. The Comparison of Acid-Base Values at the First, Second, Third, and Fourth Days.

ABG	The First Day			The Second Day			The Third Day			The Forth Day
	Bupivacaine	Bupivacaine + Dexmedetomidine	P Value	Bupivacaine	Bupivacaine + Dexmedetomidine	P Value	Bupivacaine	Bupivacaine + Dexmedetomidine	P Value	Bupivacaine	Bupivacaine+Dexmedetomidine	P Value
pH	7.39 ± 0.07	7.38 ± 0.08	0.66	7.36 ± 0.04	7.41 ± 0.03	0.025	7.39 ± 0.01	7.41 ± 0.52	0.00	7.4 ± 0.01	7.41 ± 0.03	0.001
BE	1.02 ± 0.5	0.51 ± 0.45	0.9	1.27 ± 0.48	1.34 ± 0.64	0.001	0.93 ± 0.22	1.22 ± 0.57	0.00	1.76 ± 0.37	1.02 ± 0.06	0.005
PCo 2	38.85 ± 3.53	39.96 ± 7.43	0.002	38.88 ± 1.3	37.66 ± 0.58	0.00	38.5 ± 1.52	36.28 ± 5.24	0.00	39.38 ± 2.31	36.22 ± 1.8	0.7
SaO 2	81.93% ± 23.18	88.76% ± 0.11	0.00	93.12% ± 2.18	93.5% ± 1.2	0.003	93.71% ± 1.27	94.84 ± 1.16	0.002	93.96% ± 1.53	98.31% ± 0.96	0.02
PAO 2	56.34 ± 5.95	67.34 ± 5.75	0.46	71.56 ± 10.64	78.01 ± 6.1	0.002	74.28 ± 18.89	84.62 ± 5.24	0.023	80.87 ± 3.91	86.37 ± 8.81	0.001