Table 2.
Differences in variables associated with acid-base balance and parameters assessing acid-base status in survivors and non-survivors on the first day (n = 797).
| Acid-Base Marker | Survivors (n = 721) | Non-Survivors (n = 76) | p Value |
|---|---|---|---|
| pH | 7.38 (7.33–7.42) | 7.25 (7.08–7.35) | <0.001 |
| pCO2, mmHg | 38 (33–42) | 35 (30–44) | 0.268 |
| pO2, mmHg | 85 (73–98) | 75 (61–97) | 0.001 |
| O2 saturation, % | 96 (94–97) | 93 (86–96) | <0.001 |
| HCO3−, mEq/L | 22.2 (19.3–24.8) | 16.0 (12.4–19.2) | <0.001 |
| tCO2, mEq/L | 23.4 (20.4–26.1) | 17.4 (13.5–20.4) | <0.001 |
| BE, mmol/L | −2.3 (−5.5–0.4) | −10.9 (−16.8–−5.2) | <0.001 |
| SIDa, mEq/L | 42.5 (40.5–44.5) | 44.0 (40.6–48.6) | 0.001 |
| SIDe, mEq/L | 25.5 (22.4–28.1) | 19.7 (16.1–22.9) | <0.001 |
| SIG, mEq/L | 16.6 (13.9–20.3) | 23.5 (19.4–32.4) | <0.001 |
| ATot, mEq/L | 5.2 (4.8–5.7) | 5.4 (4.8–6.1) | 0.021 |
| corAG, mmol/L | 13.8 (11.1–17.5) | 23.0 (17.3–29.9) | <0.001 |
Abbreviations: pH, power of hydrogen; pCO2, partial pressure of carbon dioxide; pO2, partial pressure of oxygen; HCO3−, bicarbonate concentration; tCO2, total concentration of carbon dioxide; BE, base excess; SIDa, apparent strong ion difference; SIDe, effective strong ion difference; SIG, strong ion gap; ATot, total concentration of serum weak acids; corAG, corrected anion gap.