Allergic Rhinitis

Essentials

• The connection and interrelatedness between rhinitis and asthma must be borne in mind, and whenever possible the investigations and treatment should include both conditions.
• Instead of trying to avoid allergens, the patient's tolerance to allergens should be enhanced in different ways. The avoidance of allergens is needed when the symptoms are severe, but as soon as the situation has calmed down, methods that strengthen tolerance should preferably be applied.
• Investigations performed by an ENT specialist are required if the symptoms are severe and unresponsive to treatment, if allergen-specific immunotherapy (desensitisation) is considered or if there is a suspicion of occupational rhinitis.

Signs and symptoms

• See table T1

Epidemiology

• It is estimated that up to 30% of the population suffer from hypersensitivity rhinitis. 20-30% of it is allergic rhinitis, half non-allergic rhinitis and the remaining 20-30% have both forms, i.e. so-called mixed rhinitis.
• In the majority of cases allergic rhinitis is caused by pollen allergy (deciduous trees, grasses, mugwort). Other common causes of allergic rhinitis include animal and cereal allergens and other organic dusts, often from occupational exposure.

Investigations and findings

• Carefully compiled patient history
  • Previous history of atopy
  • The character of symptoms (seasonal or all year round; intermittent or persistent according to ARIA [Allergic Rhinitis and its Impact on Asthma] classification, picture 1)
  • Symptoms (clear nasal secretions, stuffy and itching nose, rhinorrhoea, sneezing)
    • About 70% of patients with allergic rhinitis have concurrent conjunctival symptoms in the eyes (redness, tearing, itching).
  • Associated diseases (sinusitis, otitis media, asthma)
  • Exposure data (particularly if an occupational disease is suspected)
• Rhinoscopy, preferably using a headlight and topical nasal decongestant (a complete ENT examination is indicated during the first visit), if the patient complains of nasal congestion.
  • The aim is to identify nasal polyps Nasal Polyps.
  • Livid pale grey or bluish mucous membranes (suggestive of an allergic reaction, but other types of findings do not exclude allergy)
  • Secretions may vary from clear watery to mucous.
• Serum IgE studies and/or skin prick tests are indicated for the planning of treatment, for consideration of allergen-specific immunotherapy (desensitisation) and for diagnosing possible occupational rhinitis Investigation of Atopy.

Further investigations

• Referral to an ENT specialist is warranted when
  • the patient has severe, treatment-resistant rhinitis
  • occupational rhinitis is suspected.

ARIA guidelines

• ARIA (Allergic Rhinitis and its Impact on Asthma) guidelines http://www.euforea.eu/about-us/aria.html, which have been drafted by an expert panel together in collaboration with the WHO, are research and treatment guidelines for general practitioners and specialists. The emphasis is on the concept "one airway, one disease". The connection and inter-relatedness of rhinitis and asthma must be borne in mind and whenever possible the investigations and treatment should include both conditions.

Treatment

• Pharmacotherapy should include a combination of drugs from different pharmaceutical groups administered individually according to the symptoms and treatment response.
• In allergic rhinitis, antihistamines http://www.dynamed.com/condition/allergic-rhinitis#ORAL_ANTIHISTAMINES are the most effective drugs to control sneezing and the production of mucus.
• Antihistamines are also available as nasal sprays and eye drops.
• Combination products (antihistamine + sympathomimetic) have a good effect on nasal congestion. They should not be used continuously for more than 10 days.
• Nasal glucocorticoidshttp://www.dynamed.com/condition/allergic-rhinitis#INTRANASAL_CORTICOSTEROIDS are effective against all symptoms of allergic rhinitis. In children, products with low systemic bioavailability should be preferred.
• Nasal sprays combining an antihistamine and a nasal glucocorticoid is also available for patients over 12 years of age.
• Sodium cromoglicatehttp://www.dynamed.com/condition/allergic-rhinitis#CROMOLYN__NASAL_ shows some effect against all symptoms of rhinitis, but its efficacy is only modest.
• Leukotriene receptor antagonists may be suitable for the treatment of allergic rhinitis in patients with asthma http://www.dynamed.com/condition/allergic-rhinitis#LEUKOTRIENE_RECEPTOR_ANTAGONISTS.
• Desensitisation therapy (hyposensitisation, allergen immunotherapy) http://www.dynamed.com/condition/allergic-rhinitis#ALLERGEN_IMMUNOTHERAPY: see Allergen Immunotherapy
• The management of other symptoms associated with allergic rhinitis:
  • eye drops for allergic ocular symptoms (mast cell stabilisers, antihistamines)
  • nasal sprays and solutions (water or oil based) to condition and moisten mucous membranes if the use of antihistamines or nasal glucocorticoids causes dryness or irritation
  • short-term use of sprays containing a sympathomimetic drug (no longer than for 7-10 days) if relief from nasal congestion is required before treatment with nasal glucocorticoids is started.

Pharmacotherapy in different types of rhinitis