Posted by RenoTom on December 20, 2002 at 23:27:01:

In Reply to: Theoretic question about humidifier posted by CluelessandTired on December 17, 2002 at 20:04:42:

With NPAP there is an increase in air movement. There is a greater volume of air in a given space when under pressure(gasses compress under pressure). The inflated lung (after inhale) has a greater volume than after exhale. There will be a greater increase in volume after inhale when under pressure. This results in more air movement.
The bodies defense system traps contaminents in a mucus layer which is moved upwards by cilia to expel the potentially damaging materials. This system works best at 37c (98.6f) with 100% relitive humidity.
The upper airway preconditions the air that we breath to the ideal temp and humidity levels of the defense system. The increased air movement of NPAP has a cooling and drying effect which causes irritation and reduced fluidity which reduces the effectiveness of the system. Continued exposure to the drying effects can result in inflammation (increased obstruction) increasing pressure requirements and contributing to mouth breathing.
Some have stated that the need for heat is to increase moisture levels which it will do. But the defense system needs the warmth to stay in peek condition in order to work properly.
Fisher and Paykel's site has some good information on the subject. You do have to dig for it however.
RenoTom

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