Skip to main content

Table 4 Inspired relative and absolute humidity

From: Measurement of tracheal temperature is not a reliable index of total respiratory heat loss in mechanically ventilated patients

Inspired gas-conditioning device

RH (%)

AH (mgH2O/l)

HH

  

   45 min

99.5 ± 0.8

34.0 ± 1

 

(97-100)*

(31.2-35.9)*

   6 h

99.6 ± 0.7

33.9 ± 0.8

 

(97-100)*

(31.3-35.4)*

   24 h

99.5 ± 0.7

33.7 ± 0.7

 

(97-100)*

(31.0-35.3)*

Hydrophobic HME

  

   45 min

94.8 ± 4.0

25.3 ± 2.0

 

(86-100)

(21.6-28.8)

   6 h

93.6 ± 4.5

25.9 ± 1.6

 

(84-100)

(23.5-28.3)

   24 h

93.0 ± 7.2

24.5 ± 1.2

 

(79-100)

(22.9-26.9)

Hygroscopic HME

  

   45 min

91.7 ± 5.1

28.0 ± 1.6

 

(84-98)

(25.7-29.7)

   6 h

91 ± 5.1

28.8 ± 1.0

 

(90-98)

(27.3-29.5)

   24 h

93.0 ± 4.9

28.3 ± 2.3

 

(87-100)

(25.0-31.8)

  1. Values are expressed as mean ± standard deviation (range). *P < 0.001 versus hydrophobic and hygroscopic HME; P < 0.001 versus hydrophobic HME.