Table 4.
Arterial Blood Gas Analysis in the ED
| No ABG | Univariate | Multivariate | ||
|---|---|---|---|---|
| |
n/N |
% [95% CI] |
OR [95% CI] |
OR [95%CI] |
| Site |
|
|
||
| ED1 |
73/222 |
33 [27–39] |
1 |
1 |
| ED2 |
119/199 |
60 [53–67] |
3.0 [2.0–4.5] |
2.5 [1.6–3.9] |
| ED3 |
65/99 |
66 [56–75] |
3.9 [2.4–6.4] |
3.7 [2.1–6.7] |
| ED4 |
20/98 |
20 [12–28] |
0.5 [0.3–0.9] |
0.6 [0.3–1.2] |
| ED LOS (h) |
– |
– |
1.0 [0.9–1.0] |
1.0 [0.9–1.0] |
| Ventilation type |
|
|
|
|
| Invasive |
215/484 |
44 [40–49] |
1 |
1 |
| Non-invasive |
54/118 |
46 [37–55] |
1.1 [0.7–1.6] |
1.6 [0.8–3.3] |
| Both |
8/16 |
50 [26–75] |
1.3 [0.5–3.4] |
5.3 [1.5–19.2] |
| Reason for ventilation |
|
|
|
|
| Respiratory/cardiac |
70/182 |
39 [31–46] |
1 |
1 |
| Trauma |
65/168 |
39 [31–46] |
1.0 [0.7–1.6] |
0.9 [0.6–1.6] |
| Neurological |
66/124 |
53 [45–62] |
1.8 [1.1–2.9] |
1.9 [1.1–3.3] |
| Cardiac arrest |
32/62 |
20 [14–26] |
1.7 [1.0–3.1] |
1.9 [1.0–3.9] |
| Other | 12/21 | 57 [36–78] | 2.1 [0.9–5.3] | 2.4 [0.9–6.5] |
ABG = arterial blood gas, OR = odds ratio, CI = confidence interval, ED = emergency department, LOS = length of stay.