Table 4.

Arterial blood gas analysis

Characteristics	Before operation		POD 1		POD 2		POD 3
	PVB	IVPCA	PVB	IVPCA	PVB	IVPCA	PVB	IVPCA
PaCO2 (mmHg)	38.04±5.27	37.32±2.31	38.72±8.68	39.53±3.27	38.63±3.17	39.45±2.45	36.86±4.66	42.66±2.45
pH	7.38±0.04	7.428±0.01	7.36±0.05	7.388±0.03	7.40±0.04	7.337±0.01	7.43±0.02	7.345±0.01

Note: Results are presented as mean ± SD.

Abbreviations: PVB, paravertebral block; IVPCA, intravenous patient-controlled analgesia; POD, postoperative day.