Insufficient Humidification of Respiratory Gases in Patients Who Are Undergoing Therapeutic Hypothermia at a Paediatric and Adult Intensive Care Unit
Table 2
Y-piece gas conditions with three humidifier settings.
Identification
37-default setting
33.5-theoretical setting
33.5-adjusted setting
Chamber outlet temperature
Y-piece temperature
Y-piece humidity (mg/L)
Chamber outlet temperature
Y-piece temperature
Y-piece humidity (mg/L)
Chamber outlet temperature
Y-piece temperature
Y-piece humidity (mg/L)
Patient
Study
Set
Actual
Set
Actual
Set
Actual
Set
Actual
Set
Actual
Set
Actual
1
1
37
36.9
40
39.9
25.1
33.5
33.6
36.5
37.0
18.6
40.5
40.5
38.5
38.6
35.6
2
37.0
40.0
19.0
33.5
36.4
5.7
40.0
39.4
38.0
38.0
36.4
2
1
37.7
37.1
46.3
33.1
36.3
33.2
37.0
36.3
37.0
36.4
40.2
3
1
37.0
39.9
28.9
33.4
36.6
20.6
37.0
36.5
36.5
37.1
36.2
2
36.7
37.8
34.3
34.0
37.0
25.9
36.5
35.3
36.5
37.1
36.4
4
1
37.0
39.2
28.8
33.9
35.7
17.6
40.0
39.9
38.0
37.8
36.8
5
1
37.1
39.9
29.9
33.0
36.5
19.2
39.0
39.2
38.0
38.0
36.9
6
1
37.2
39.1
38.0
33.5
35.9
31.9
36.0
35.9
38.0
38.0
36.7
2
37.2
39.1
38.0
33.5
36.0
31.9
35.0
35.0
37.0
36.8
35.0
Mean
37.0
39.1
32.0
33.5
36.4
22.7
37.9
37.9
37.5
37.5
36.9
95% CI
Lower
36.9
38.5
26.8
33.3
36.1
16.9
36.6
36.2
37.0
37.1
35.5
Upper
37.2
39.8
37.3
33.7
36.7
28.6
39.2
39.0
38.0
38.0
38.3
Three humidifier settings, 37-default (current clinical recommendation; chamber-outlet, 37°C; Y-piece, 40°C), 33.5-theoretical (theoretically adjusted setting for body temperature 33.5°C; chamber-outlet, 33.5°C; Y-piece, 36.5°C), and 33.5-adjusted (optimised setting to achieve saturated vapour at 33.5°C, or 36.6 mg/L, using feedback from a thermohygrometer), were tested. CI: confidence interval. Set: temperature setting for the humidifier. Actual: actual observations of the temperature value.
