Table 2.
Relationships between measurement differences (|PaCO 2 -PtCO 2 |) and patient characteristics, univariate and multivariate analysis (ANCOVA)
| Univariate analysis | Multivariate analysis | |||
|---|---|---|---|---|
| Variable | OR [95% CI] | P-value | OR [95% CI] | P-value |
| Sex | 1.61 [0.18-14.25] | 0.66 | ||
| Past medical history | ||||
| Acute pulmonary edema | 0.29 [0.03-2.96] | 0.29 | ||
| COPD | 0.60 [0.06-6.18] | 0.67 | ||
| Ischemic heart disease | 0.75 [0.06-8.91] | 0.82 | ||
| Home oxygen | 1.01 [0.06-16.77] | 0.99 | ||
| Heart rate | 0.98 [0.94-1.03] | 0.40 | ||
| Systolic blood pressure | 1.01 [0.97-1.05] | 0.60 | ||
| Diastolic blood pressure | 0.97 [0.91-1.03] | 0.33 | ||
| Respiratory rate | 1.01 [0.88-1.18] | 0.85 | ||
| Temperature | 2.45 [0.93-6.49] | 0.07 | 3.01 [1.16-7.80] | 0.03 |
| PaCO 2 | 1.05 [1.00-1.12] | 0.06 | 1.06 [1.00-1.12] | 0.05 |
| PtCO 2 | 1.06 [1.00-1.13] | 0.06 | ||
| PaO 2 | 1.21 [1.01-1.45] | 0.04 | 1.22 [1.02-1.47] | 0.03 |
| HCO 3 | 0.96 [0.80-1.15] | 0.64 | ||
| Base excess | 0.96 [0.82-1.12] | 0.60 | ||
| Lactate | 1.44 [0.43-4.79] | 0.54 | ||
| Hemoglobin | 1.20 [0.74-1.95] | 0.45 | ||
| White blood cells | 0.91 [0.74-1.12] | 0.38 | ||
| C-reactive protein | 1.00 [0.99-1.01] | 0.72 | ||
| Glycemia | 4.70 [0.62-35.58] | 0.13 | ||
| Brain natriuretic peptide | 1.00 [1.00-1.00] | 0.82 | ||
ANCOVA: Analysis of covariance; COPD: Chronic obstructive pulmonary disease; CI: Confidence interval; PaCO 2: Partial pressure of carbon dioxide in the blood; PtCO 2: Transcutaneous partial pressure of carbon dioxide in the blood; PaO 2: Partial pressure of dioxygen in the blood.