An Improved Device for Posterior Rhinomanometry to Measure Nasal Resistance

[+] Author and Article Information
Joseph Tiran1

Department of Mechanical Engineering, Pearlstone Center for Aeronautical Engineering Studiestiran@bgumail.bgu.ac.il

Nir Ben-Oved

Department of Mechanical Engineering, Pearlstone Center for Aeronautical Engineering Studies

Elan Elvaiah, Aviva Weisel-Eichler

Department of Biomedical Engineering,  Ben-Gurion University of the Negev, Beer Sheva, Israel

Youval Slovik, Alberto Leiberman, Daniel M. Kaplan

Department of Otolaryngology, Head and Neck Surgery,  Soroka University Medical Center, Beer Sheva, Israel


Corresponding author address: Dept. of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva, Israel 84105.

J Biomech Eng 127(6), 994-997 (Jul 10, 2005) (4 pages) doi:10.1115/1.2049310 History: Received December 22, 2004; Revised July 10, 2005

Rhinomanometry is a method for measuring nasal resistance for the purpose of providing an objective evaluation of nasal patency. Posterior rhinomanometry is accomplished without the use of a mask, thus allowing the patient to breathe naturally. Here, we report on the improvements we have made to the existing posterior rhinomanometry system. In this system, nasal air flow is measured indirectly by measuring the pressure differential across a small mesh window in the body plethysmograph. We have calibrated this measurement and developed software that automatically provides the correct values for all airflow rates. Also, we have developed software that automatically corrects for the phase shift caused by the plethysmograph structure. These refinements should provide more accurate values for nasal resistance.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Plethysmograph system. The drawing shows the plethysmograph system which includes the box, mesh air resistance element, nasal pressure probe, nasal pressure transducer, plethysmograph pressure transducer, signal amplifier, and computer.

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Figure 2

Calibration of plethysmograph. Y-axis indicates the measured rates of steady airflow introduced into or withdrawn from the plethysmograph box. X-axis is the resulting, experimentally determined pressure differential across the airflow resistance element of the plethysmograph box. The relationship is nonlinear.

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Figure 3

Changes in nasal airflow and pressure during five breathing cycles. Graphs are data from a typical subject. The solid line shows changes in nasal air pressure differential, and dotted line shows changes in nasal airflow.

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Figure 4

Scattergram of nasal air flow versus nasal air pressure. This is a scattergram for a typical subject, which includes all points measured during five breathing cycles. The X-axis is nasal air pressure differential and Y axis is nasal airflow. The dotted curve indicates radius 2 and dotted line indicates pressure differential of 75Pa. Positive values represent inspiration, and negative values represent expiration.




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