Table 4.

Arterial (radial) and cerebral venous (internal jugular bulb) measurements of $P_{{\mathrm{O}}_2}$ and $P_{\mathrm{C}{\mathrm{O}}_2}$, $S_{\mathrm{a}{\mathrm{O}}_2}$, haematocrit (Hct), haemoglobin (tHb), Glu, Lac and pH at baseline and during similar hypoxic breathing with mild‐HH and severe‐HH

	$P_{{\mathrm{O}}_2}$ (mmHg)	$P_{\mathrm{C}{\mathrm{O}}_2}$ (mmHg)	$S_{\mathrm{a}{\mathrm{O}}_2}$ (%)	Hct (%)	tHb (mmol L–1)	Glu (mmol L–1)	Lac (mmol L–1)	pH
Baseline
Arterial	91.6 ± 13.7	38.6 ± 5.1	98 ± 1	43.9 ± 3.7	14.3 ± 1.2	5.4 ± 0.5	0.9 ± 0.3	7.43 ± 0.05
Venous	29.5 ± 4.1	50.1 ± 4.2	60 ± 5	44.6 ± 4.1	14.6 ± 1.3	4.9 ± 0.6	1.0 ± 0.3	7.37 ± 0.04
Mild‐HH
Arterial	38.9 ± 7.8*	46.3 ± 3.2*	75 ± 8*	44.7 ± 3.8*	14.6 ± 1.2*	5.3 ± 0.5	0.9 ± 0.3	7.38 ± 0.03*
Venous	28.0 ± 3.4	52.6 ± 2.6*	54 ± 7*	44.6 ± 3.4	14.6 ± 1.1	5.0 ± 0.5	0.9 ± 0.3	7.35 ± 0.02*
Severe‐HH
Arterial	38.0 ± 8.9*	58.7 ± 4.3*	68 ± 12*	45.3 ± 3.4*	14.8 ± 1.1*	5.3 ± 0.4	0.8 ± 0.3	7.30 ± 0.02*
Venous	30.8 ± 5.5	62.3 ± 4.1*	55 ± 11*	45.2 ± 3.6	14.8 ± 1.2	5.2 ± 0.4	0.9 ± 0.3	7.29 ± 0.02*

^*Significant difference from baseline.