Table 1.

Blood parameters

	Control		Metabolic acidosis			Hypercapnic acidosis
	Baseline st	Baseline end	Δ	Baseline	Acidosis	Δ	Baseline	Acidosis	Δ
PaCO2	5.39 ± 0.85	5.17 ± 0.68		5.34 ± 0.79	5.8 ± 1.08		5.04 ± 0.5	15.57 ± 1.37	↑
PvCO2	7.09 ± 1.4	6.46 ± 0.83		6.73 ± 0.66	7.97 ± 1.15	↑	6.14 ± 0.38	17.19 ± 1.89	↑
PaO2	16.7 ± 3.72	14.85 ± 2.85		16.71 ± 3.7	16.61 ± 4.11		17.74 ± 6.38	15.17 ± 1.2
PvO2	4.01 ± 0.38	3.94 ± 0.52		3.96 ± 0.43	6.03 ± 0.8	↑	4.21 ± 0.88	7.74 ± 0.88	↑
pHa	7.52 ± 0.06	7.53 ± 0.05		7.52 ± 0.03	7.10 ± 0.01	↓	7.56 ± 0.01	7.10 ± 0.02	↓
pHv	7.45 ± 0.06	7.47 ± 0.04		7.46 ± 0.02	7.03 ± 0.02	↓	7.50 ± 0.02	7.06 ± 0.02	↓
$$\mathrm{HC}{O}_3{}_a^{–}$$	31.68 ± 2.53	29.84 ± 7.29		34.14 ± 4.18	13.1 ± 2.17	↓	33.5 ± 3.21	34.7 ± 2.32
$$\mathrm{HC}{O}_3{}_v^{–}$$	35.88 ± 2.45	31.52 ± 7.52		35.11 ± 2.9	15.19 ± 1.64	↓	34.84 ± 2.26	35.8 ± 2.47
Hb	86.63 ± 10.2	85.63 ± 13.55		80.5 ± 12.97	89.5 ± 13.93	↑	81.75 ± 8.38	103.5 ± 9.87	↑
Sata	99.26 ± 1.46	98.7 ± 2		99.18 ± 1.27	95.8 ± 3.81	↓	98.94 ± 1.32	94.38 ± 2.8	↓
Satv	49.26 ± 7.48	47.13 ± 4.06		49.11 ± 8.44	49 ± 6.25		50.13 ± 7.76	63.75 ± 2.18	↑
BEa	9.53 ± 2.67	9.83 ± 2.04		10.48 ± 4.07	−16.56 ± 2.26	↓	11.73 ± 3.06	5.71 ± 2.19	↓
BEv	12.3 ± 2.39	10.29 ± 3.76		11.89 ± 3.12	−15.5 ± 1.76	↓	12.11 ± 2.22	6.08 ± 2.26	↓

↑, significantly increased, P < 0.05; ↓, significantly decreased, P < 0.05; P_aCO₂, arterial partial pressure of CO₂ (kPa); P_vCO₂, venous partial pressure of CO₂ (kPa); P_aO₂, arterial partial pressure of O₂ (kPa); P_vO₂, venous partial pressure of O₂ (kPa); pH_a, arterial pH; pH_v, venous pH; $\mathrm{HC}{O}_3{}_a^{-}$, $\mathrm{HC}{O}_{}{}_3^{–}$ concentration in arterial blood (mM); $\mathrm{HC}{O}_3{}_v^{-}$, $\mathrm{HC}{O}_{}{}_3^{–}$ concentration in venous blood (mM); Hb, hemoglobin concentration (g/L); Sat_a, hemoglobin saturation in arterial blood (%); Sat_v, hemoglobin saturation in venous blood (%); BE_a, base excess in arterial blood (mM); BE_v, base excess in venous blood (mM). The venous blood refers to mixed venous blood sampled from the pulmonary artery.