| REVIEW OF LITERATURE INTRODUCTION Rhinitis refers to any kind of inflammatory condition of the nasal mucosal linings. Generally, acute rhinitis is associated with environmental allergies or respiratory viral infections. Viral microbes with numerous types and subtypes can infect the respiratory epithelium of the nasal cavity in a repetitive fashion throughout the year, or during a specific period of time such as winter or fall. (5) Acute Rhinitis is often short-lived inflammation of the mucous membrane of the nose that is caused by a variety of viruses, usually common cold. It occurs both in children as well as adults. Children may suffer 4-6 episodes whereas adults may suffer 3 episodes of Acute Rhinitis per year. (6) TYPES (3) (7) (8) There are several types of rhinitis. The most common are acute rhinitis, which is usually caused by a viral illness, allergic or seasonal rhinitis, and nonallergic or year-round rhinitis. (7) Rhinitis is classified as allergic or nonallergic. The cause of nonallergic rhinitis is usually a viral infection, although irritants can cause it. The nose is the most commonly infected part of the upper airways. Rhinitis may be acute (short-lived) or chronic (long-standing). (3) Rhinitis may be classified as follow: (8) 1) INFECTIVE RHINITIS Acute Rhinitis Non-specific: Common cold Specific: Diphtheria Chronic Rhinitis 2) NON-INFECTIVE RHINITIS Allergic Seasonal Perennial Vasomotor ETIOLOGY (7) (9) The most common causes of rhinitis are, Pollen given off by trees, grass, and weeds, Dust mites, Mold, Cockroach waste, Animal dander, Fumes and odors, Temperature, Hormonal changes, Certain medicines and overuse of topical nose sprays, Changes in the environment, Smoke, Certain foods or spices etc. (7) Acute rhinitis triggers can be allergic or non-allergic. Non-allergic triggers include infections, medication or occupational factors such as exposure to irritants such as wheat in mills or when baking, which can lead to symptoms of both rhinitis and asthma. (9) Allergic triggers can be differentiated by the duration of the symptoms: whether perennial (year-round) or seasonal or whether there is an association with being indoors or outdoors. Indoor environmental allergens that are perennial are house dust mite, and cat and dog dander. House dust mite allergy tends to be worse at the coast as opposed to the dryer Highveld as mites need ambient humidity to procreate and grow. However, what has emerged is that even perennial indoor allergens can cause exacerbations of rhinitis when individuals become house-bound as has occurred during the coronavirus disease 2019 (COVID-19) ‘lockdown’. In addition, in winter periods, when indoor living coincides with winter bedding taken out of storage, exacerbations of AR may occur even in mid-winter, outside of the pollen season. (9) TYPES OF ACUTE RHINITIS (9) | TYPE | AETIOLOGY | | Viral Rhinitis | Most likely viral infection if symptoms less than 2 weeks | | Seasonal Rhinitis | Correlates with outdoor allergens such as grass, tree and weed pollen, and Alternaria and Cladosporium (mold) | | Pollution spike | Increased indoor pollution: prolonged time spent indoors, fires, gas stoves, pets, air conditioner filters Increased outdoor pollution (9) | PREVALENCE Regarding the worldwide prevalence of rhinitis among children, the International Study of Asthma and Allergies in Childhood (ISAAC), which is considered as the landmark study in this field, reported in 2004 a prevalence of self reported current nasal symptoms of 31.7 percent (ranging from 11.9 percent to 80.6 percent) based on data from 97 countries. (10) Acute rhinitis, allergic and/or non-allergic, is common and will affect all people at some time. The onset is abrupt and usually lasts for a couple of days. Children are especially vulnerable and episodes occur up to four times more frequently when compared with adults. Events are often perceived as trivial and self-limiting but may become very troublesome. It is particularly important to recognize and manage them appropriately when acute exacerbations are due to allergy. (9) Children who are younger than 2 years of age will often be thought to have a viral infection (a common cold) rather than acute AR. (9) PREVALANCE OF COMMON COLD/AVR (Acute Viral Rhinitis) (5) (11) (12) The common cold, also called viral rhinitis, is one of the most common infectious diseases in humans. The infection is usually mild and improves without treatment. Because of the large number of people who get the common cold, this illness results in more than 22 million days of missed school and an even greater number of absent days from work every year in the United States. The average American has 1 to 3 colds per year. (12) The common cold is an upper respiratory infection that is caused by several families of viruses. Within these virus families, more than 200 specific viruses that can cause the common cold have been identified. The virus family that causes the most colds is called rhinovirus. Rhinoviruses cause up to 40 percent of colds, and this virus family has at least 100 distinct virus types in its group. Other important upper respiratory virus families are named coronavirus, adenovirus and respiratory syncytial virus. Since so many viruses can cause cold symptoms, development of a vaccine for the common cold has not been possible. (12) Rhinoviruses cause most colds in the early fall and spring. Other viruses tend to cause winter colds and their symptoms can be more debilitating. There is no evidence that going out in cold or rainy weather makes you more likely to catch a cold. (12) Young children have an average of 6-8 colds per year, but 10–15 percent of children have at least 12 infections per yr. The incidence of illness decreases with increasing age, with 2-3 illnesses per year by adulthood. Children in out-of-home daycare centers during the 1st year of life have 50 percent more colds than children cared for only at home. (11) Risk of experiencing AVR in a single year is much more probable for children than adults. While children experience 8–12 colds a year, adults usually experience 2–3 colds per year. (5) PREVALENCE OF ALLERGIC RHINITIS India is the second most populous country (1·35 billion people) in the world and is classified as a lower-middle income country. Nearly 20 percent of the world’s population live in India. An Indian study reported that prevalence of allergic rhinitis was 11·3 percent in children aged 6–7 years, and 24·4 percent in children aged 13–14 years. Allergic rhinitis affected all pediatric age group and was peaked at age group 11–14 years and 5–7 years. Allergic rhinitis was recorded as the one and only allergic disease in 59 percent of the children diagnosed with allergic rhinitis, concomitant asthma in 16 percent of them, atopic dermatitis in 8 percent and allergic conjunctivitis in 5 percent. 54 percent of asthmatic children was diagnosed allergic rhinitis, while 16 percent of allergic rhinitis children was diagnosed asthma. (13) SYMPTOMS AND DIAGNOSTIC CRITERIA
Symptoms consist of runny nose, sneezing, congestion, postnasal drip, cough, and very rare low-grade fever. SYMPTOMS SEEN IN COMMON COLD (8) There are 4 stages of common cold: Ischemic Stage (After an incubation period of 1 to 3 days) (1) Burning in the nasopharynx may be the first symptom. (2) Irritation and dryness in the nose soon follow. (3) Sneezing occurs paroxysmal. (4) Shivering and malaise may develop. Hyperemic Stage (1) Rhinorrhea becomes profuse. (2) Blocking of the nose occurs. The mucosa is hyperemic (3) Anosmia may be present. (4) Fever and headache may be present. Stage of Secondary Infection Discharges becomes yellow or greenish, and thickens. Stage of Resolution It occurs in 5 to 10 days. SYMPTOMS OF ACUTE EXACERBATION OF ALLERGIC RHINITIS (9) (8) Acute AR is usually associated with paroxysms of sneezing, anterior and posterior rhinorrhea, nasal obstruction and nasal itch. The complaint of ‘itch’ is often prominent in acute allergic rhinitis and patients may also report itching of the palate and eyes (sometimes with tears). Troublesome symptoms such as sleep-disrupting breathing and impairment of daily activities will be noted in more severe disease. Children are often not efficient at nasal clearance. (9) Symptoms like: (8) Irritation in the nose is the initial symptom. Paroxysmal Sneezing of recurrent type is usually present, which exhausts the patient. Rhinorrhea is watery and copious. Nasal Obstruction due to venous stasis is often present. Anosmia may be present intermittently or continuously. Headache can be present In Acute Stage: The mucosa appears to be pale with excessive mucoid or watery secretions as a sign of acute rhinitis (8) EVALUATING PATIENTS FOR ACUTE RHINITIS (14)  |