Clin Exp Otorhinolaryngol.  2012 Sep;5(3):156-160. 10.3342/ceo.2012.5.3.156.

Intersession Repeatability of Acoustic Rhinometry Measurements in Healthy Volunteers

Affiliations
  • 1Academic Unit of Respiratory Medicine, UCL Medical School, London, UK. alahmari87@hotmail.com

Abstract


OBJECTIVES
Acoustic rhinometry is a rapid, reliable and non-invasive technique for the evaluation of conditions associated with impaired nasal patency. This study aimed to examine the intersession repeatability of acoustic rhinometry measurements of unilateral and combined nasal parameters in a group of healthy volunteers.
METHODS
Twenty healthy volunteers were studied. In each subject, acoustic rhinometry measurements were performed on five consecutive days, with multiple recordings. Five clinically relevant parameters were measured in each session and the intersession repeatability of these measurements was expressed in terms of mean coefficient of variation, intraclass correlation coefficient and inter-item correlations.
RESULTS
Intraclass correlation coefficients showed a high, and greater repeatability over time for all the combined (mean) values compared to the unilateral values. All intraclass correlations for combined values were > or =0.80 confirming almost perfect agreement. All intraclass correlations and inter-item correlations were associated with P<0.001. The mean coefficient of variation was low (<10%) for all but the proximal minimum cross sectional area (MCA1) measurements.
CONCLUSION
Acoustic rhinometry provides highly repeatable measurements of nasal patency, which is best for combined (mean) nasal parameters. This property makes it suitable for use in the diagnosis and follow-up of conditions associated with nasal obstruction, either structural or functional.

Keyword

Acoustic rhinometry; Reproducibility of results; Nasal obstruction

MeSH Terms

Acoustics
Nasal Obstruction
Reproducibility of Results
Rhinometry, Acoustic

Figure

  • Fig. 1 Handling and positioning of the device by the subject. Reproduced with the permission of the volunteer.

  • Fig. 2 An example acoustic rhimonetry trace.The x-axis represents distance from the nostril (at 0 cm), and the y-axis represents the nasal cross-sectional area (cm2). MCA1 and MCA2 (arrow 1) correspond to the nasal valve and anterior half of the inferior turbinate, respectively. D-MCA1 and D-MCA2 (arrow 2) correspond to the distance of MCA1 and MCA2 from the nasal orifice (x, 0 cm) respectively. The green arrow (arrow 3) indicates the segment used for the calculation of nasal volume between 2 and 5 cm into the nose (V2-5), and arrow 4 the nasal orifice.


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