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4Rhino

4-Phase rhinomanometry, or High Resolution Rhinomanometry, is a new way for depicting the relation between flow and differential pressure of the nasal air stream. By adopting digital measurement techniques, high-resolution 4-phase rhinomanometry represents a scientific and technical advancement on “classical” computerised rhinomanometry.

In contrast to other rhinomanometry devices, the 4Rhino system creates a realistic representation of the entire breathing cycle based on 3,000 individual measurements. This precise evaluation of the breathing cycle replaces the rough estimation of airflow at a few points with exact measurements. Also, the elastic behavior of the nasal valve is visualised in the graphs as a first-view and can be evaluated numerically.

Features¹

  • Measuring instead of guessing.
  • Introduction of logarithmic parameters (VR & Reff) related to the subjective sensing of the obstruction. Cf. Weber-Fencher law, which also applies to the pressure and subjectively perceived intensity in breathing. The new logarithmic parameters have been validated clinically through analysis of 36,563 cases.
  • Prompt visual information about the nasal valve. If a valve phenomenon exists, the sides of the rhinogram curve will deviate considerably.

The 4Rhino advantage¹

  • Classical rhinomanometry does not take into account the differences between accelerating and decelerating phases. Consequently, serious hidden errors occur based on incorrect mean values when the flow is measured at a differential pressure of 150 Pa only. The one-value method of classical rhinomanometry severely limits the validity of nasal provocation tests.
  • In classical rhinomanometry, the impact of the nasal valve is not graphically displayed. Furthermore, results are falsified by the use of foam profiles, which inhibit the elasticity of the nasal valve and change the position of the septum.
  • 4-Phase rhinomanometry takes into account and includes the inertia force of the air, which plays a considerable role in rhinomanometry, especially in the lower flow ranges.
  • Several studies confirm that there is no correlation between the measured resistance parameters and subjective sensation in classical rhinomanometry (Fokkens, 2014; Sipilä, 1994; Salihoglu, 2014).

For further information about 4Rhino or to arrange a visit by one of our product specialists, please contact us here.

 

Reference Material

References

1. Klaus Vogt, Klaus-Dieter Wernecke, Hans Behrbohm, Wolfgang Gubisch & Mara Argale Four-phase rhinomanometry: a multicentric retrospective analysis of 36,563 clinical measurements Springerlink.com 2015