[Comparison of rhinomanometric values expressed by rate--validity and normal range]

Area of Science:

• Respiratory Physiology
• Medical Instrumentation
• Biomedical Engineering

Background:

• Nasal patency is typically measured by nasal resistance, but this value varies throughout the respiratory cycle.
• A consistent reference point for nasal resistance measurement has not been standardized, hindering data comparison.
• Existing methods lack a universally accepted standard for comparing nasal airflow data.

Purpose of the Study:

• To develop a novel method for estimating nasal respiratory conductivity independent of a reference point.
• To provide a parameter that allows for easier comparison of nasal airflow data in clinical and research applications.
• To establish a standardized approach for assessing nasal patency.

Main Methods:

• Utilized Rohrer's equation, validated by polynomial regression, to model nasal pressure-flow curves.
• Calculated the area under the curve (AUC) for individual nasal airflow measurements.
• Developed a standard curve using mean AUC from 47 healthy subjects to derive conductivity parameters (K1 and K2).

Main Results:

• A new method was established to express individual nasal airflow curves using a single parameter.
• Standard curve parameters for expiration (K1=0.5476, K2=1.3653) and inspiration (K1=0.4080, K2=1.4750) were determined.
• A normal range for nasal respiration conductivity was proposed as >0.7.

Conclusions:

• The proposed method simplifies the assessment and comparison of nasal airflow data.
• This approach offers a convenient and standardized tool for both clinical practice and basic research in rhinomanometry.
• The new conductivity parameter facilitates objective evaluation of nasal patency across different individuals and studies.