Table 2.
Acid–base characteristics of arterial plasma of the study population
| Variables | Controls (n = 25) | SAH (n = 20) | p value |
|---|---|---|---|
| pH | 7.42 ± 0.02 | 7.45 ± 0.04 | < 0.001 |
| PCO2 (mm Hg) | 39 ± 3 | 37 ± 6 | 0.15 |
| ATOT (mmol/L) | 16.3 ± 1.5 | 13.5 ± 1.6 | < 0.001 |
| SID (mmol/L) | 36.2 ± 1.8 | 37.2 ± 3.7 | 0.23 |
| PO2 (mm Hg) | 99 ± 49 | 111 ± 28 | 0.35 |
| Na+ (mmol/L) | 138 ± 2 | 142 ± 4 | < 0.001 |
| K+ (mmol/L) | 4.0 ± 0.3 | 3.5 ± 0.2 | < 0.001 |
| Ca2+ (mmol/L) | 1.22 ± 0.03 | 1.17 ± 0.04 | < 0.001 |
| Mg2+ (mmol/L) | 0.84 ± 0.07 | 0.85 ± 0.07 | 0.88 |
| Cl− (mmol/L) | 109 ± 2 | 111 ± 5 | 0.03 |
| Lac− (mmol/L) | 1.1 ± 0.4 | 1.0 ± 0.5 | 0.25 |
| HCO3− (mmol/L) | 25.0 ± 2.0 | 25.5 ± 2.9 | 0.19 |
| Phosph− (mEq/L) | 1.9 ± 0.3 | 1.5 ± 0.5 | 0.004 |
| Alb− (mEq/L) | 11.3 ± 1.1 | 9.6 ± 1.1 | < 0.001 |
| SBE (mmol/L) | 0.5 ± 2.0 | 1.6 ± 2.6 | 0.09 |
| Osmolarity (mOsm/L) | 281 ± 3 | 291 ± 8 | < 0.001 |
| Gluc (mg/dL) | 100 ± 11 | 129 ± 20 | < 0.001 |
| Gluc ratio (%) | 59 ± 6 | 58 ± 8 | 0.55 |
| Hb (g/dL) | 14.0 ± 1.6 | 11.4 ± 1.6 | < 0.001 |
| RBC (× 106/µL) | 4.5 ± 0.5 | 3.6 ± 0.7 | < 0.001 |
| WBC (× 103/µL) | 5.9 ± 1.0 | 10.2 ± 2.4 | < 0.001 |
Data are expressed as mean ± standard deviation
Alb−, ionized albumin concentration, ATOT, total amount of weak noncarbonic acids, Ca2+, ionized calcium concentration, Cl−, chloride concentration, Gluc, glucose concentration, Hb, hemoglobin concentration, HCO3−, bicarbonate concentration, K+, potassium concentration, Lac−, lactate concentration, Mg2+, magnesium concentration, Na+, sodium concentration, PCO2, partial pressure of carbon dioxide, Phosph−, ionized phosphate concentration, PO2, partial pressure of oxygen, RBC, red blood cell count, SAH, aneurismal subarachnoid hemorrhage, SBE, standard base excess, SID, strong ion difference, WBC, white blood cell count