Evidence for passing down of postnasal drip into respiratory organs.

Unlabelled: Postnasal drip is believed to be one of the main sources of serious respiratory diseases, such as sinobronchial syndrome. However, there is little direct evidence showing that postnasal drip flows into the trachea and results in the development of inflammatory responses in the lower airway. In the present study, whether postnasal drip entered the respiratory organs and whether material in the trachea moved toward the lungs and the digestive organs were examined by using an experimental model with mice.