Comparison of classic and 4-phase rhinomanometry methods, is there any difference?

Abstract

There are various different parameters used to measure nasal airway resistance (NAR) in rhinomanometry, which include the classic method at fixed pressure of 150Pa or 75Pa and 4-phase rhinomanometry. This study aims to determine if there is any difference between the measurements of NAR obtained by the classic and 4-phase rhinomanometry methods. In-vitro study with measurements of NAR using both methods when applied across four artificial nose models. No statistically significant differences were found between NAR values obtained from both methods. Strong, positive correlations were found between NAR measured with both methods, which were statistically significant. Bland-Altman method also showed good agreement between both methods with narrow limits of agreement. There is high level of conformity between the values of nasal airway resistance measured using both methods.