Non-specific nasal reactivity: a proposed method of study

Area of Science:

• Respiratory Medicine
• Allergology
• Pulmonology

Background:

• Assessing non-specific airway hyperreactivity is crucial for diagnosing and managing respiratory conditions.
• Current methods for evaluating nasal hyperreactivity can be limited.
• Ultrasonic nebulized distilled water (UNDW) has been explored for bronchial challenges.

Purpose of the Study:

• To evaluate the efficacy of ultrasonic nebulized distilled water (UNDW) bronchial challenge for assessing non-specific nasal hyperreactivity.
• To simultaneously assess bronchial hyperreactivity using the same UNDW challenge method.
• To compare responses in patients with allergic rhinitis, asthma, and healthy controls.

Main Methods:

• A cohort of 23 allergic rhinitis patients, 12 healthy controls, 2 asthma patients, and 3 asthma and rhinitis patients underwent bronchial challenge.
• The challenge involved exposure to ultrasonic nebulized distilled water (UNDW).
• Nasal resistance (NR) and specific airway conductance (sGaw) were measured simultaneously using plethysmography.

Main Results:

• A significant increase in nasal resistance (NR) was observed in 19/23 rhinitis patients and all patients with asthma and rhinitis.
• Only 2/12 normal subjects and 0/2 asthma patients showed increased NR.
• A significant decrease in specific airway conductance (sGaw) was noted in all asthma patients and those with asthma and rhinitis, but in only 1/12 normals and 3/23 rhinitis patients.

Conclusions:

• Bronchial challenge with ultrasonic nebulized distilled water (UNDW) is a suitable method for assessing non-specific nasal hyperreactivity.
• The UNDW challenge also appears effective for evaluating bronchial hyperreactivity.
• This unified method offers a potential diagnostic tool for both nasal and bronchial hyperresponsiveness.