| Venous blood | CSF | p-value |
---|
pH | 7.40 ± 0.03 | 7.33 ± 0.04 | < 0.0001 |
pO2 [mmHg] | 53.7 ± 12.1 | 77.0 ± 8.7 | < 0.0001 |
pCO2 [mmHg] | 41.3 ± 5.1 | 48.5 ± 3.9 | < 0.0001 |
SBE [mmol/L] | 1.03 ± 2.31 | − 0.21 ± 1.81 | 0.0266 |
HCO3− [mmol/L] | 25.3 ± 2.4 | 24.9 ± 1.5 | 0.429 |
Na+ [mmol/L] | 139.7 ± 2.0 | 140.1 ± 1.6 | 0.343 |
K+ [mmol/L] | 3.78 ± 0.38 | 2.73 ± 0.10 | < 0.0001 |
Cl− [mmol/L] | 103.7 ± 3.1 | 118.1 ± 2.7 | < 0.0001 |
AG (K+) [mmol/L] | 14.0 ± 1.5 | − 0.1 ± 2.7 | < 0.0001 |
Lac [mmol/L] | 1.01 ± 0.35 | 1.46 ± 0.20 | 0.0004 |
t-Bil [mg/dL] | 0.92 ± 0.62 | 0.02 ± 0.04 | < 0.0001 |
- The mean pO2 was significantly higher in the CSF than in venous blood samples, as were the mean pCO2 and lactic acid levels, suggesting that these metabolic wastes were discharged from the central nervous system into the CSF via some drainage system. All p-values are the result of a paired t-test as a parametric test or a Wilcoxon signed-rank test as a non-parametric test
- AG, anion gap; Cl−, chloride ion; CSF, cerebrospinal fluid; HCO3−, bicarbonate; K+, potassium ion; Na+, sodium ion; pCO2, carbon dioxide partial pressure; Lac, lactic acid; pO2, oxygen partial pressure; SBE, standard base excess; t-Bil, total bilirubin