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Relationship between the relative nasal diameter and pulmonary function

N Usui

    Auris, Nasus, Larynx
    |January 1, 1980
    PubMed
    Summary
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    Altering the nasal cavity significantly impacts lung function. The nose contributes substantially to total pulmonary resistance, with changes influenced by reflex control, especially during nasal breathing.

    Area of Science:

    • Respiratory Physiology
    • Nasal Airway Mechanics

    Background:

    • The nasal cavity plays a crucial role in airflow resistance and respiratory mechanics.
    • Understanding the nasal contribution to pulmonary function is essential for respiratory health assessment.

    Purpose of the Study:

    • To investigate the mechanical effects of the nasal cavity on pulmonary function.
    • To quantify the nasal contribution to total respiratory resistance and compliance.

    Main Methods:

    • Measurement of respiratory system compliance and resistance during various breathing phases.
    • Calculation of relative nasal diameter to assess nasal airway mechanical properties.
    • Analysis of pressure-flow relationships in the lower airway.

    Main Results:

    Related Experiment Videos

    • Nasal compliance is similar to mouth compliance, except in cases of severe nasal obstruction.
    • Inspiratory resistance exceeds expiratory resistance.
    • The nose accounts for approximately 40% of total pulmonary resistance during normal nasal breathing.
    • Pulmonary resistance changes non-linearly with the degree of nasal obstruction.

    Conclusions:

    • The nasal airway is a significant determinant of overall pulmonary resistance.
    • Reflex control mechanisms likely explain the non-linear relationship between nasal obstruction and pulmonary resistance.
    • Nasal mechanical properties directly influence respiratory system function.