Table 4.
Adjustment of mechanical ventilation settings following ABG analysis
| FiO 2 25% to 40% ( n = 37,172) | FiO 2 40% to 60% ( n = 23,466) | FiO 2 60% to 80% ( n = 4,318) | FiO 2 80% to 100% ( n = 2,041) | Total ( n = 68,222) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PaO2 |
13.4 (4.1) |
12.6 (5.2) |
12.3 (6.6) |
16.0 (13.7) |
13.1 (5.2) |
||||||||||
| SpO2 |
98.0 (2.9) |
96.5 (3.8) |
94.3 (6.3) |
89.7 (12.5) |
96.9 (4.6) |
||||||||||
| PEEP |
5.6 (3.4) |
7.3 (4.4) |
9.1 (5.6) |
9.0 (6.3) |
6.5 (4.2) |
||||||||||
|
PaO
2
range (kPa) |
Delta FiO
2
(%) |
Delta PEEP (cm H
2
O) |
No decrease in FiO
2
or PEEP (%) |
Delta FiO
2
(%) |
Delta PEEP (cm H
2
O) |
No decrease in FiO
2
or PEEP (%) |
Delta FiO
2
(%) |
Delta PEEP (cm H
2
O) |
No decrease in FiO
2
or PEEP (%) |
Delta FiO
2
(%) |
Delta PEEP (cm H
2
O) |
No decrease in FiO
2
or PEEP (%) |
Delta FiO
2
(%) |
Delta PEEP (cm H
2
O) |
No decrease in FiO
2
or PEEP (%) |
| <7 |
+6.1 (13.8) |
+0.3 (3.2) |
87.6 |
+5.4 (13.2) |
+0.7 (3.7) |
81.3 |
+2.0 (14.5) |
+0.6 (6.0) |
86.3 |
−7.0 (16.8) |
+1.0 (6.7) |
76.9 |
+3.0 (14.8) |
+0.7 (4.3) |
83.3 |
| 7 to 10 |
+2.6 (6.7) |
+0.1 (3.1) |
81.9 |
+1.6 (7.3) |
+0.2 (4.0) |
80.3 |
−0.2 (9.4) |
+0.3 (5.2) |
80.8 |
−6.7 (14.8) |
+0.1 (5.9) |
76.5 |
+1.3 (8.3) |
+0.2 (3.8) |
80.8 |
| 10 to 15 |
+0.6 (4.9) |
−0.2 (2.7) |
72.9 |
−1.5 (6.6) |
−0.2 (3.8) |
48.2 |
−5.2 (9.2) |
+0.1 (4.9) |
33.7 |
−15.6 (19.2) |
+0.4 (5.7) |
31.1 |
−0.6 (6.7) |
−0.1 (3.2) |
62.3 |
| 15 to 20 |
−0.3 (5.1) |
−0.3 (2.7) |
65.0 |
−4.8 (7.2) |
−0.3 (3.3) |
25.1 |
−11.2 (11.4) |
+0.1 (4.7) |
13.5 |
−20.4 (20.5) |
+0.0 (4.7) |
23.6 |
−2.0 (7.3) |
−0.2 (3.0) |
52.8 |
| 20 to 25 |
−1.2 (6.4) |
−0.2 (2.4) |
54.2 |
−6.1 (9.0) |
−0.4 (3.0) |
22.1 |
−12.7 (12.4) |
−0.4 (5.3) |
11.8 |
−25.9 (21.7) |
−0.1 (4.8) |
21.3 |
−4.2 (10.1) |
−0.3 (2.9) |
40.4 |
| 25 to 30 |
−1.6 (7.0) |
−0.4 (2.8) |
51.6 |
−7.2 (9.6) |
−0.3 (2.7) |
18.8 |
−19.0 (12.1) |
−0.4 (3.8) |
9.2 |
−25.3 (21.6) |
−0.1 (4.8) |
22.9 |
−7.1 (12.2) |
−0.3 (2.9) |
32.0 |
| >30 | −1.0 (6.6) | −0.4 (4.0) | 69.8 | −3.5 (9.6) | −0.4 (4.5) | 43.0 | −15.4 (15.8) | +0.3 (5.7) | 24.8 | −33.6 (23.2) | −0.4 (4.0) | 14.3 | −5.7 (15.9) | −0.3 (4.2) | 51.6 |
Data are means (±SD), unless stated otherwise. Delta = difference between two successive ABG samples.