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The human nasal cycle.

M Hasegawa, E B Kern

    Mayo Clinic Proceedings
    |January 1, 1977
    PubMed
    Summary

    The nasal cycle, an alternating congestion and decongestion of nasal airways, was studied using rhinomanometry. Most individuals (72%) exhibit a defined nasal cycle, though they are typically unaware of it due to stable total nasal resistance.

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    American journal of rhinology·1999

    Area of Science:

    • Physiology
    • Otolaryngology

    Background:

    • The nasal cycle is a natural, yet often unnoticed, physiological phenomenon.
    • Understanding nasal airflow dynamics is crucial for diagnosing nasal obstruction.

    Purpose of the Study:

    • To investigate the prevalence and characteristics of the nasal cycle in a large, healthy population.
    • To define objective criteria for identifying the nasal cycle using rhinomanometry.

    Main Methods:

    • Active posterior rhinomanometry with a mask-flowmeter was employed.
    • Continuous data collection over approximately 7 hours for 50 healthy subjects.
    • Defined the nasal cycle based on a >20% resistance change between nasal airways over 30 minutes.

    Main Results:

    • 72% of subjects demonstrated a clearly defined nasal cycle.
    • The cycle involved alternating congestion/decongestion, with resistance differences reversing at least once.
    • Total nasal resistance remained relatively constant, masking the cycle in individuals.

    Conclusions:

    • The nasal cycle is a common physiological event in healthy individuals.
    • Rhinomanometry can objectively quantify the nasal cycle.
    • Awareness of the nasal cycle is limited due to compensatory mechanisms maintaining stable airflow resistance.

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