Nonallergic rhinitis is inflammation of the inner part of the nose that is not caused by an allergy. Nonallergic rhinitis involves symptoms including chronic sneezing or having a congested, drippy nose without an identified allergic reaction. Other common terms for nonallergic rhinitis are vasomotor rhinitis and perennial rhinitis. The prevalence of nonallergic rhinitis in otolaryngology is 40%. Allergic rhinitis is more common than nonallergic rhinitis; however, both conditions have similar presentation, manifestation and treatment. Nasal itching and paroxysmal sneezing are usually associated with nonallergic rhinitis in comparison to allergic rhinitis.
Nasal mucosa has a rich blood supply and has venous sinusoids or "lakes" surrounded by smooth muscle fibers. These smooth muscle fibers act as sphincters and control the filling and emptying of sinusoids. Sympathetic stimulation causes vasoconstriction and shrinkage of mucosa, which leads to decongestion of the nose. Parasympathetic stimulation causes not only excessive secretion from the nasal gland but also vasodilatation and engorgement, which lead to rhinorrhoea and congestion of the nose. The autonomic nervous system, which supplies the nasal mucosa, is under the control of the hypothalamus. Therefore, emotions play a significant role in nonallergic rhinitis.
|Drug Induced||NSAIDS AND ASA, ACEI and Beta Blockers||Intense eosinophilic inflammation with an overproduction of cysteinyl leukotrienes and other prostanoids||profuse rhinorrhea, red eyes, periorbital edema, asthma attacks|
|Hormonal||Pregnancy||Nasal congestion present during pregnancy without other cause, disappears after two weeks of delivery||Rhinorrhea and nasal congestion|
|Idiopathic||Unknown cause||Vasomotor Rhinitis and nonallergic rhinitis with eosinophilia|
|Occupational||Caused by work||Inflammatory disease of the nose causing intermittent and persistent symptoms arising out of causes and conditions attributable to a particular work environment; can be elicited by single or multiple exposures. Corrosive rhinitis is the most severe form||frequently associated with concurrent asthma, nonallergic form is without latency. Nasal challenge test confirms the diagnosis|
Other forms of nonallergic rhinitis
- Rhinitis medicamentosa - topical decongestant nasal drops are notorious for causing rebound phenomenon. Their excessive use causes rhinitis if treated by withdrawal of nasal drops, short course of systemic steroid therapy and in some cases, surgical reduction of turbinates, if they have become hypertrophied.
- Rhinitis of pregnancy - pregnant women may develop persistent rhinitis due to hormonal changes. Nasal mucous become edematous and block the airway. Some may develop secondary infection and even sinusitis in such cases. Care should be taken while prescribing drugs. Generally, local measures such as limited use of nasal drops, topical steroids and limited surgery (cryosurgery) to turbinates are sufficient to relate the symptoms. Safety of developing fetus is not established for newer antihistamines and they should be avoided.
- Honeymoon rhinitis - this usually follows sexual excitement, leading to nasal stuffiness.
- Gustatory rhinitis - spicy and pungent food may in some people produce rhinorrhea, nasal stuffiness, lacrimation, sweating and flushing of face. It can be relieved by ipratropium bromide nasal spray (an anticholinergic), a few minutes before meal.
- Non-air flow rhinitis - it is seen in patients of laryngectomy, tracheostomy and choanal atresia. Nose is not used for air flow and the turbinates become swollen due to loss of vasomotor control. In choanal atresia there is an additional factor of infection due to stagnation of discharge in the nasal cavity which should otherwise drain freely into nasopharynx.
Paroxysmal sneezing in morning, especially in morning while getting out of the bed. Excessive rhinorrhea - watering discharge from the nose when patient bends forward. Nasal obstruction - bilateral nasal stuffiness alternates from one site to other; this is more marked at night, when the dependent side of nose is often blocked. Postnasal drip.
Absolute eosinophil count, nasal smear, skin and in vitro allergy tests to rule out allergic rhinitis, acoustic rhinometry for measuring nasal patency, smell testing, CT scan in cases of sinus disease and MRI in case of mass lesions.
The avoidance of inciting factors such as sudden changes in temperature, humidity, or blasts of air or dust is helpful.
Astelin (Azelastine) "is indicated for symptomatic treatment of vasomotor rhinitis including rhinorrhea, nasal congestion, and post nasal drip in adults and children 12 years of age and older."
Reduction of hypertrophied turbinates, correction of nasal septum deviation, removal of polyps, sectioning of the parasympathetic secretomotor fiber to nose (vidian neurectomy) for controlling refractory excessive rhinorrhea.
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