A quantitative technique for assessing nasal airway impairment

Area of Science:

• Respiratory Physiology
• Dentofacial Development
• Medical Engineering

Background:

• Assessing nasal airway impairment is crucial for understanding its impact on dentofacial development.
• Current methods lack reliability, creating controversy regarding nasal respiration's effects.
• A validated technique is needed to objectively define normal and impaired nasorespiratory function.

Purpose of the Study:

• To develop and validate a quantitative technique for estimating nasal airway dimensions.
• To establish objective criteria for defining normal and impaired nasorespiratory function.
• To provide a tool for assessing the efficacy of treatments aimed at improving nasal respiration.

Main Methods:

• Modified theoretical hydraulic principle to estimate nasal airway cross-sectional area (NA).
• Simultaneous measurement of nasal airflow (V) and pressure drop (ΔP) using transducers and computer analysis.
• Utilized an analog upper airway model to determine the discharge coefficient (k) and assess measurement error.

Main Results:

• The developed technique demonstrated a measurement error of less than 5% for nasal cross-sectional areas between 0.02 and 1.2 cm².
• Mean smallest cross-sectional nasal areas were 0.62 cm² (±0.17) in adults and 0.43 cm² (±0.076) in children (8-11 years).
• The method provides a reliable quantitative assessment of nasal airway dimensions.

Conclusions:

• The validated technique enables clinicians to estimate airway size during breathing.
• It allows for distinguishing between normal and impaired nasal respiratory function.
• The method quantitatively assesses the impact of surgical or orthodontic interventions on nasal respiration.