Table 7.
Analysis of the arterial blood gas, venous blood gas, and mixed ABG/VBG regression model.
| Died (15) | Survived (20) | Mann–Whitney p | Univariate logistic regression OR (95% CI) | p | ||
|---|---|---|---|---|---|---|
| ABG (known FiO2) | P/F median (Q1–Q3) | 199.33 (88.57–277.14) | 251.19 (188.86–323.1) | 0.1306 | 0.99 (0.984–1.001) | 0.094 |
| pO2 median (Q1–Q3), mmHg | 62 (58.2–73.4) | 63.75 (51.2–74) | 0.6745 | 1 (0.989–1.008) | 0.7798 | |
| pCO2 median (Q1–Q3), mmHg | 36.4 (32.1–63.9) | 39.25 (35.35–42.75) | 0.915 | 1.01 (0.969–1.048) | 0.6801 | |
| pH median (Q1–Q3) | 7.38 (7.17–7.46) | 7.42 (7.38–7.46) | 0.1876 | 0.01 (0.000–1.485) | 0.07 | |
| sO2 median (Q1–Q3), % | 92.4 (87.5–95.7) | 93.85 (87.95–96.2) | 0.5586 | 0.95 (0.869–1.041) | 0.2779 | |
| HCO3− median (Q1–Q3), mmol/L | 20.1 (15–24.1) | 25.3 (23.5–26.4) | 0.0092 | 0.74 (0.579–0.937) | 0.013 | |
| BE median (Q1–Q3), mmol/L | −5.9 (−13.8 do −1.2) | 1.25 (−0.9 do 2.3) | 0.0115 | 0.8 (0.661–0.959) | 0.0166 | |
| LAC median (Q1–Q3), mmol/L | 3.3 (1.8–9) | 1.15 (0.85–1.7) | <0.0001 | 1.58 (1.013–2.470) | 0.0435 | |
|
| ||||||
| Died (17) | Survived (45) | |||||
| VBG (known FiO2) | P/F median (Q1–Q3) | 108.57 (87.8–127) | 140 (87.62–169.52) | 0.1445 | 0.99 (0.976–1.002) | 0.1146 |
| pO2 median (Q1–Q3), mmHg | 30.7 (25–38.1) | 30 (23.2–36.4) | 0.7635 | 1.02 (0.960–1.080) | 0.5268 | |
| pCO2 median (Q1–Q3), mmHg | 44.2 (38.7–56.2) | 43.7 (41.6–48.6) | 0.6815 | 1.03 (0.958–1.111) | 0.403 | |
| pH median (Q1–Q3) | 7.34 (7.26–7.39) | 7.38 (7.35–7.42) | 0.0288 | 1.05 (0.235–4.658) | 0.9516 | |
| sO2 median (Q1–Q3), % | 42.6 (32.4–72.1) | 56 (33.7–67.8) | 0.9595 | 1 (0.970–1.025) | 0.8482 | |
| HCO3− median (Q1–Q3), mmol/L | 21 (17.3–25.2) | 24.6 (23.7–25.8) | 0.0293 | 0.95 (0.841–1.064) | 0.3555 | |
| BE median (Q1–Q3), mmol/L | −3.5 (−6.9–2.5) | 1.8 (0–3.2) | 0.0465 | 0.94 (0.857–1.0342) | 0.2095 | |
| LAC median (Q1–Q3), mmol/L | 2.6 (1.5–4.7) | 1.7 (1.1–2.25) | 0.0135 | 1.8 (1.129–2.875) | 0.0134 | |
|
| ||||||
| Died (38) | Survived (70) | |||||
| ABG/VBG | P/F median (Q1–Q3) | 126.36 (88.19–192.05) | 163.81 (103–200) | 0.2536 | 1 (0.992–1.002) | 0.3663 |
| pO2 median (Q1–Q3), mmHg | 43.05 (26.4–61.4) | 36.35 (26.9–50.9) | 0.3966 | 1 (0.994–1.010) | 0.5153 | |
| pCO2 median (Q1–Q3), mmHg | 45.1 (36.4–59) | 42.8 (38.5–48.4) | 0.4699 | 1.01 (0.977–1.047) | 0.5106 | |
| pH median (Q1–Q3) | 7.35 (7.17–7.41) | 7.39 (7.35–7.43) | 0.0117 | 0.7 (0.200–2.421) | 0.5703 | |
| sO2 median (Q1–Q3), % | 72.45 (34.4–91.4) | 67.8 (44.1–87.8) | 0.8539 | 1.01 (0.990–1.024) | 0.4065 | |
| HCO3− median (Q1–Q3), mmol/L | 20.7 (15.6–24.5) | 24.7 (23.3–26.2) | 0.0003 | 0.87 (0.788–0.964) | 0.0075 | |
| BE median (Q1–Q3), mmol/L | −3.55 (−10.3–1.3) | 1.5 (−0.9–2.9) | 0.0004 | 0.89 (0.822–0.961) | 0.031 | |
| LAC median (Q1–Q3), mmol/L | 3.15 (1.7–8) | 1.5 (1.1–2.2) | <0.0001 | 1.68 (1.221–2.3064) | 0.0014 | |
OR, odds ratio; CI, confidence interval; P/F, PaO2/FiO2 ratio; BE, base excess; LAC, lactate. For the clarity, in each table the P < 0.05 has been highlighted in bold letters.