Abstract
Nasal respiration permits the bulk of humidification of inspired air to be performed in the nose; oral respiration shifts the burden of humidification distally. Nebulization therapy, by decreasing the drying effect of inspired air on upper airway mucous membranes and by deposition of droplets on the mucus and exudates of the lower airways, would be anticipated to be of value in disorders of the airways. Jet nebulizers produce mist with moisture content 25 to 35 mg. H 2 O per liter. Their efficiency can be increased through the use of saline or propylene glycol. Ultrasonic nebulizers produce mists with moisture content up to 175 mg. H 2 O per liter of air. The approach to nebulization therapy is greatly altered by the site of pathology, and the presence or absence of nasal respiration. The proper position of nebulization in the physician's armamentarium has not been established.
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