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Humidification for Adults
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The normal lung warms and humidifies (conditions) INSPIRED air, recovers heat and moisture from EXPIRED air and DEFENDS the lung from contaminants.
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Inspired Air
The upper airway
warms and humidifies inspired air, so that it reaches core temperature and saturation (100% RH) just below the Carina (i.e. gas conditioning).1
cleans inspired air by filtering and clearing foreign matter, e.g. sneezing, gagging, coughing and the mucociliary transport system.2
This optimizes gas exchange and protects the delicate lung tissue.
Expired Air
As the air is exhaled, only a quarter of the heat and moisture is recaptured2. Replenishment from the systemic reserves is necessary to prepare for conditioning of the next inspired breath.
Defence of the Lung
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References
- Dery R. The Evolution of Heat and Moisture in the Respiratory Tract During Anaesthesia with a Non-Rebreathing System. Canad. Anaesth. Soc. J. 1973; 20:3:296-309
- Walker JE et al. Heat and Water Exchange in the Respiratory Tract. Am. J. Med. 1961 Feb; 259-267
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