Endotracheal temperature and humidity in laryngectomized patients in a warm and dry environment and the effect of a heat and moisture exchanger

Head Neck. 2011 Sep;33(9):1285-93. doi: 10.1002/hed.21597. Epub 2010 Oct 27.


Background: This study was designed to assess endotracheal climate in laryngectomized patients in a warm and dry environment and the effects of a heat and moisture exchanger (HME).

Methods: Endotracheal temperature and humidity were measured in 11 laryngectomized patients with a regularly used HME (Provox Normal HME; R-HME), an HME with antimicrobial filter (Provox Micron HME; F-HME), and without HME (open stoma). Measurements were performed at 32°C, 34°C, and 38°C (<25% relative humidity).

Results: Both R-HME and F-HME increased end-inspiratory humidity (AH(insp)) equally (range, 3.4 to 5.6 mg H(2)O/L). The R-HME has a cooling effect on end-inspiratory temperature (T(insp)), which is similar for all tested environmental conditions (-3.8°C); F-HME decreases T(insp) less (range, -1.3 to -0.6°C).

Conclusions: In a warm and dry environment, both R- and F-HME significantly cool and humidify inspired air. Therefore, consistent use of an HME under these climate conditions is also probably clinically beneficial.

MeSH terms

  • Aged
  • Aged, 80 and over
  • Body Temperature / physiology*
  • Exhalation / physiology
  • Female
  • Humans
  • Humidity*
  • Inhalation / physiology
  • Laryngectomy*
  • Male
  • Middle Aged
  • Respiratory Therapy / instrumentation*
  • Temperature*
  • Trachea / physiology