Abstract:

Objective   To study the variation of airflow curves in the nasal cavity and airflow in different anatomical regions.  Methods   Ten volunteers with normal nasal mucosa were selected by a nasal endoscope examination. Electronic smog was breathed by volunteers through smoking, and kept in the oral pharynx and lower air passage. The normal airflow variation was observed when respirations were conducted for 1 second, 1.5 seconds and 2 seconds.  Results   Upward and laminar airflow passed through the roof of the nasopharynx, most of which curved to the common meatus, and a small amount rushed at the middle turbinate and flowed in the middle meatus and the olfactory sulcus, but only a tiny minority rushed into the inferior meatus from the back and moved in a turbulent flow. The majority of the airflow was turbulent when passing limen nasi.   Conclusion   Direction is changed when airflow passes a bank between the roof of nasopharynx and posterior naris, most of which runs in the common meatus base, with very little in the superior meatus. The majority airflow in the inferior meatus is turbulent. Expiratory airflow has little effect on the mucous membrane of the middle meatus and olfactory sulcus.

Key words: Nasal cavity; Airflow； Expiratory phase； Smoke