Open AccessNasal airflow dynamics: mechanisms and responses associated with an external nasal dilator strip
Author(s) -
Kirkness J.P.,
Wheatley J.R.,
Amis T.C.
Publication year - 2000
Publication title -
european respiratory journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.021
H-Index - 241
eISSN - 1399-3003
pISSN - 0903-1936
DOI - 10.1034/j.1399-3003.2000.15e20.x
Subject(s) - dilator , airflow , medicine , mechanics , physics , engineering , biomedical engineering , mechanical engineering
The adhesive external nasal dilator strip (ENDS) is widely advocated for prevention of snoring and promotion of nasal breathing during exercise. In the present study, the effects of the ENDS on nasal airflow resistance ( R n) in normal subjects were examined and factors determining individual responses to the ENDS explored. Using posterior rhinomanometry, 20 healthy Caucasian adults (10 males, 10 females; age: 18–56 yrs) were studied during quiet tidal breathing and voluntary hyperpnoea with (ENDS) and without (control) ENDS and with a placebo strip (placebo) before and after application of a topical nasal decongestant (oxymetazoline hydrochloride). During tidal breathing, only nine subjects showed a significantly (p<0.05) decreased inspiratory and/or expiratory R n with the ENDS (“responders”). During the control, inspiratory R n (at 0.4 L·s ‐1 ) was higher in “responders” than “nonresponders” (3.28±0.16 versus 2.60±0.08 cmH 2 O·L ‐1 ·s; p=0.04). The effects of nasal decongestant and the ENDS were additive. During voluntary hyperpnoea, inspiratory R n (at 1.0 L·s ‐1 ) and the hysteresis of the inspiratory transnasal pressure/flow curve were decreased with the ENDS in most subjects. It is concluded that the external nasal dilator strip influences nasal airflow dynamics by both dilation of the nasal valve and stabilization of the lateral nasal vestibule walls and may be more effective in subjects with a high resting nasal airflow resistance.