Rhinomanometric reference intervals for normal total nasal airflow resistance.

Area of Science:

• Otolaryngology
• Respiratory Physiology
• Medical Statistics

Background:

• Nasal airflow resistance is crucial for diagnosing nasal obstruction.
• Current data lacks standardized and reliable reference intervals.
• This study aimed to establish standard 95% reference intervals (RIs).

Purpose of the Study:

• To determine standard 95% reference intervals for normal total nasal airflow resistance.
• To address the lack of standardized data in nasal airflow measurements.
• To provide a basis for improved diagnosis of nasal obstruction.

Main Methods:

• A meta-analysis of 38 studies using active anterior rhinomanometry.
• Data collected under both congested and decongested nasal mucosal conditions.
• Analysis focused on differential pressure of 150Pa.

Main Results:

• Overall mean nasal airflow resistance under congested conditions: 0.25Pa/cm3/s (95%-RI 0.10-0.40Pa/cm3/s).
• Specific RIs determined for adults, men, women, and different ethnic groups (Asian, African, Caucasian).
• Decongested conditions showed lower overall mean values.

Conclusions:

• The established reference intervals and mean values enhance nasal obstruction diagnosis.
• These findings can supplement existing guidelines for rhinomanometry standardization.
• Improved standardization of rhinomanometric measurements is facilitated.