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External nasal morphology and respiratory function.

P M Spalding1, P S Vig

  • 1School of Dentistry, University of Michigan, Department of Orthodontics and Pediatric Dentistry, Ann Arbor.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 1, 1990
PubMed
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External nasal shape does not reliably predict nasal breathing function. This study found no correlation between nasal morphology measurements and objective nasal airway resistance or airflow, advising against assumptions based on appearance.

Area of Science:

  • Otolaryngology
  • Respiratory Physiology
  • Facial Morphology

Background:

  • Clinicians often infer nasal respiratory function from external facial appearance.
  • Specific nasal morphologic features are commonly assumed to indicate impaired nasal airflow.

Purpose of the Study:

  • To develop objective measures of anterior external nasal morphology.
  • To investigate the correlation between these nasal morphology measures and actual nasal respiratory function.

Main Methods:

  • Nasal casts were created from 60 subjects.
  • Four external nasal morphology parameters were measured: nasal base shape, minimum nasal orifice width, nasal orifice shape, and nasal orifice area.
  • Nasal function was assessed using posterior rhinomanometry (nasal airway resistance) and simultaneous nasal/oral respirometry (airflow).

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Main Results:

  • No statistically significant correlations were identified between any of the measured external nasal morphology parameters and objective measures of nasal respiratory function.
  • This indicates that external nasal form is not a reliable predictor of internal nasal airflow or resistance.

Conclusions:

  • Subjective clinical appraisal of external nasal form should not be used to assume a patient's nasal breathing function.
  • Objective physiological testing is necessary for accurate assessment of nasorespiratory function.