Non-allergic rhinitis: diagnosis and management.

Area of Science:

• Otolaryngology
• Allergy and Immunology

Background:

• Non-allergic rhinitis presents diagnostic challenges, encompassing diverse conditions like infections, hormonal changes, and autonomic dysfunction.
• Pathogenesis, diagnosis, and treatment for non-allergic rhinitis are often more complex than for allergic rhinitis.
• Systemic disorders must also be considered in patients with rhinitis symptoms.

Purpose of the Study:

• To outline diagnostic and treatment strategies for patients presenting with rhinitis symptoms despite negative skin prick tests.
• To highlight the importance of a thorough patient history and relevant investigations in managing non-allergic rhinitis.
• To discuss the role of nitric oxide measurements and combined therapies in rhinitis management.

Main Methods:

• Detailed patient history taking to identify potential underlying causes.
• Consideration of investigations including allergen challenges for potential skin prick and RAST-negative allergic rhinitis.
• Measurement of nitric oxide levels to assess for inflammation or conditions like primary ciliary dyskinesia and cystic fibrosis.

Main Results:

• Non-allergic rhinitis encompasses a broad spectrum of conditions with varying pathogeneses.
• Elevated nitric oxide levels suggest inflammation, while very low levels may indicate primary ciliary dyskinesia or cystic fibrosis.
• A trial of combined topical corticosteroids with antihistamines or anticholinergics may benefit patients without an obvious underlying pathology.

Conclusions:

• Accurate diagnosis of non-allergic rhinitis necessitates a comprehensive approach beyond standard allergy testing.
• Identifying and treating the underlying cause is paramount; combined therapies offer a viable option for idiopathic cases.
• The interplay between allergic and infectious rhinitis warrants further investigation for improved patient outcomes.