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DE LA SALLE HEALTH SCIENCES INSTITUTE COLLEGE OF MEDICINE

DEPARTMENT OF FAMILY AND COMMUNITY MEDICINE

CM2 SY 2011-2012

OUTPUT 2: REVIEW OF RELATED LITERATURE (REVISED)

Group 1A, Dr. Jovilia M. Abong

Research Question: Among students aged 13-14 with allergic rhinitis of selected schools in Dasmarias,

Cavite, will exposure to air-conditioned school rooms affect the severity of their allergic rhinitis?

General Objective: To determine if the exposure to the air-conditioning system affects the severity of

allergic rhinitis in high school students, aged 13-14, of selected schools in Dasmarias, Cavite.

y Specific Objectives:o To identify the prevalence of allergic rhinitis among high school students, aged 13-14, of

selected schools in of Dasmarias, Cavite based on their exposure to air-conditioned

rooms.

o To identify the prevalence of allergic rhinitis among high school students, aged 13-14, ofselected schools in Dasmarias, Cavite based on their exposure to non-air-conditioned

classrooms.

o To determine the severity of allergic rhinitis according to ARIA classifications.o To identify the risk factors of allergic rhinitis present in the classroom or school, such as

pollen, molds, and cockroaches.

o To determine the number of hours exposed to the classroom with or without air-conditioning system according to ARIA classifications.

o Compare the severity of allergic rhinitis in students who are exposed to air-conditionedclassrooms and those who are not exposed to air-conditioned classrooms.

Background Information Regarding the Research Question:

According to a demographic and epidemiologic study by Settipane, allergic rhinitis affects more than

20% of the American population.[1]

This percentage is alarming on its own, making allergic rhinitis fairly

common among the population. Furthermore, it was observed by the ISAAC (International Study of

Allergy and Asthma in Children) that the Philippines was ranked with the highest prevalence rate of

common allergies (rhinitis and asthma) - encompassing countries like Thailand, Indonesia, and South

Korea. These studies have triggered interest into the disease and have inspired us to study the disease

further as well.[2]

From the same study by the ISAAC, they discovered that among Filipino teenagers, 13-14 year-

olds presented with the highest prevalence rate among age groups with 32.5% of them having allergic

rhinitis. [2] Hence, our study will be focusing on the specific age group mentioned.

Ventilation and air-conditioning systems can be sources of microbial aerosols either from

contaminated air entering the system or directly from microbial growth within the system. Poor

ventilation may allow an accumulation of particulates, pollutants, and allergens inside school buildings

and decreased air circulation may increase transmission of respiratory infections. Building structural

problems, such as heating or air conditioning systems venting near an air intake may contribute to these

exposures. Due to this, the associations between school absenteeism and poor ventilation, vermin, and


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cumulative exposure to building condition problems are greater for younger students. Young children,

aged 5 to 18 years old,are also known to bemore susceptible to airborne pollutants than adults because of

their greater activity, smaller airways, and faster ventilation rates.[3] Therefore, it is important to look into

which of the learning environments is more likely to help students achieve their full potential and keep

them healthy.

According to Meltzer, approximately one in five children will develop symptoms of allergicrhinitis by two to three years of age. In children who are six years of age, about 40% of them will have

symptoms and up to 30% will be affected during their adolescence. [4] Furthermore, a study by Blaiss

pointed out that allergic rhinitis can interfere with a childs daily activities such as learning in school. It

also affects a childs behavior and psychosocial health thus affecting the childs quality of life overall.

Due to this, a consensus panel was formed in 2004 to assess the impact allergic rhinitis has on school

children and determine how to improve prevention and treatment, so an affected childs quality of life and

school performance could improve. One of the things they considered in this consensus is that poor

environmental conditions, such as places that have inadequate ventilation or poor indoor quality, can

exacerbate allergic rhinitis. It is advised that the best way to prevent allergic rhinitis from occurring is by

providing clean indoor environments that will reduce the amount of allergens present indoors. This

includes having an air-conditioning system and proper ventilation. [4], [5]

Research Hypothesis: Exposure to air-conditioned rooms alleviates the symptoms and occurrence of

allergic rhinitis and poor ventilation leads to its severity.

Summary of Current Knowledge Regarding Disease and Exposure of Interest

Short Description and Symptomatology of Allergic Rhinitis

Allergic rhinitis (AR), a common chronic disease, is actually a collection of symptoms that include

primarily the nose and eyes. [6] From the study done in Tehran among 7-18 years old, it is observed that

rhinorrhea, rhinitis, sneezing, eye itching and nose itching are the most common with rhinorrhea as the

most prevalent. [7] Aside from these symptoms, teary eyes, nasal congestion, post nasal drip are also

included. AR is perennial, seasonal or perennial with seasonal exacerbation. According to the study done

by Cauwenberge et. al., perennial AR is more difficult to define as chronic structural airway changes are

more difficult to establish and recurrent infections can mimic some of the presentations of this disease.[8]

When we say allergy, it is something that is triggered by an allergen which could come in

different forms. It could be pollen, dust, smoke, or even pet fur. When these allergens are brought into our

respiratory tract especially through our nose, it can cause an allergic reaction where the body releases

chemicals such as histamine which causes inflammatory disease of the nasal mucosa induced by an Ig E -

mediated reaction.

[9]

But according to De-Yun Wang of National University of Singapore, genetic background in terms of a family history of atopic disease has been the strongest risk factor for the

development of allergic symptoms, irrespective of the varying prevalence and environmental risk factors

in different societies. The most convincing evidence for genetic effect in the development of atopy is

derived from twin studies. And Wang concluded that atopy is a key condition in the development of

allergic diseases, particularly with the Ig E-mediated mechanism. It is a disorder with strong familial

tendency, usually starting in childhood or adolescence, when patients become sensitized and produce Ig E

antibodies in response to ordinary allergens. [10]


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Global Burden of Allergic Rhinitis

Accurate records on the prevalence of allergic rhinitis are lacking before the 20 th century. A study done on

college students by Settipane et. al. showed that 64% of 1836 students originally tested 23 years ago were

followed up. Seventeen new cases of asthma (10.5%) have developed in the 162 subjects who previouslysuffered from seasonal AR. Nineteen new cases of asthma (3.6%) had developed in the 528 subjects

without previous symptoms. Subjects without symptoms but had previous positive skin prick tests weresomewhat more likely to have developed asthma compared to people with negative tests (10.6% versus

3.2%). [8], [11]

Although there are differences among countries, the incidence and prevalence of asthma and

rhinitis is increasing worldwide.[12] Both developed and developing countries worldwide havedramatically rising prevalence of allergic disease which includes asthma; rhinitis; anaphylaxis; drug, food,

and insect allergy; eczema; urticaria (hives) and angioedema. This is problematic for children becausethey are the ones who bear the greatest burden of the rising trend over the last two decades. In spite of theincrease, even in developed countries, services for patients with allergic diseases are fragmented and far

from ideal. Very few countries have comprehensive services in this field of medicine. [13] Treatment of

AR is expensive; costing over 1,000 per individual per year in Germany. In addition, as the disease

progresses its severity to severe asthma, the cost also rises by a staggering seven-fold increase. Thisincrease is accounted for by second generation antihistamine medications which are better in efficacy butare more expensive. [14] Furthermore, there are almost no specialized services for these patients in

numerous countries. Care and medications are mainly provided by organ-based specialists such asrespiratory physicians, ear, nose and throat specialists (otorhinolaryngologists), and dermatologists. Even

though the care given is mostly adequate, it is still somehow inadequate because such specialists generallyview allergy only through their organ of interest. There is a vast majority of patients who have allergic

disease in multiple organs, which may thus be overlooked. For example, AR, conjunctivitis, and asthmaare three problems which commonly manifest together, yet affect three different organ systems. [13]

Because the prevalence of allergy has increased to such an extent, allergy must be regarded as amajor healthcare problem. The significant impact of AR is based on the degree of severity of the

symptoms. It has several consequences which includes psychological effects that affect social

interactions. This affectation creates an impact, not only on the subject, but for the family as well.According to World Health Organization (WHO) statistics, hundreds of millions of subjects in the worldsuffer from rhinitis and it is estimated that 300 million have asthma, which as aforementioned markedly

affects the quality of life of these individuals and their families. This also negatively impacts the socio-

economic welfare of society. [13]

The provision of allergy care must be led by allergy specialists so that an adequate standard of

care is achieved for all patients with these diseases. The lack of such care leads to avoidable morbidityand mortality and to substantial increased and unnecessary cost to health care systems and national

budgets. For example, it is estimated by WHO that 250,000 avoidable asthma deaths occur in the worldeach year. Because so little effort is made to provide clinical services for patients who suffer fromallergies, they often seek non-scientifically-based alternative and complementary diagnostic and

therapeutic remedies for their ailments. One of the main aspects of good allergy practice is to find thecause and prevent symptoms and disease progression, rather than just rely on medications to suppress thesymptoms. [13]

Triggers of Allergic Rhinitis


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According to Busse, an allergic reaction is usually caused by an allergen. In the cases of people with

allergic rhinitis, when they breathe in these allergens such as pollens or dust, these cause their bodies to

release certain chemicals like histamine, bradykinin, and the like. These chemicals cause the persons with

AR to experience symptoms of allergic reactions such as itching, swelling, and mucous production.

Pollens that cause AR may differ depending on the person who inhales such pollens. Usually the smaller,

hard-to-see pollens cause AR more often than the bigger ones. Examples of plants that produce the saidpollens are deciduous and evergreen trees, grasses, and ragweed. Development of symptoms may depend

on the amount of pollen present in the air. During dry, hot, windy days there may be more pollens present

in the air thus, the increasing the probability of developing symptoms of AR. However, during cool,

damp, rainy days pollens may not be abundant in the air since they would most likely be washed in the

ground. Reactions to allergens may also include eczema and asthma which are also part of the allergic

reaction. The most common cause of developing AR is still genetic in nature. The chance of having AR is

high if both parents have the disease. [15]

Togias stated that inflammatory mediators produced by mast cells that are activated by antigen-

IgE cause the symptoms of AR. The mediators directly or indirectly target the end organs. For example,

the histamine released by mast cells stimulates the sensory nerves which lead to sneezing, pruritus,rhinorrhea, and nasal congestion. Symptoms may also arise due to the phenomenon of hyper-

responsiveness to non-allergenic stimuli like cold air and other irritants. The phenomenon is believed to

have arisen from the allergic inflammation on the sensory nerves that supply the mucosa of the upper

respiratory tract mucosa. Different kinds of non-allergenic triggers were shown to act on the nasal mucosa

by the means of sensorineural stimulation. The responsiveness to these stimuli is also heightened in AR

compared to healthy individuals. Also, stimulation of sensory nerves can produce inflammatory changes

in AR. Such inflammation is called neurogenic inflammation but the mechanism behind this is not yet

known. However, Alkis also stated that evidence exists that neurotrophin nerve growth factor, the one

responsible for the changes in the sensory nerves, is found in elevated levels in the nasal secretions of

persons with perennial AR compared to healthy individuals. The nerve growth factor is also acutely

released into nasal fluids after being triggered by allergens in patients with allergic disease. AR is also

very common among patients with asthma of atopic origin. [16]

Severity of Allergic Rhinitis

Allergic rhinitis has been classified into two according to its severity: namely, mild and

moderate/severe. The difference between the two classifications of AR is seen in the impact of the

illness to the patients regular daily activities. In moderate/severe AR, daily activities are impaired and

sleep is disturbed because of its troublesome symptoms. On the other hand, the symptoms of mild AR are

tolerable enough so as not to impair the activities of the person. To add, AR can be further classified

based on the duration of symptoms manifested by the patient intermittent and persistent.

Intermittent AR occurs when symptoms last less than four (4) days per week or less than four (4)

consecutive weeks while the persistent type happens when the symptoms manifest more than four (4)

days per week or for more than four (4) consecutive weeks. [17]


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Figure 1. A diagrammatic representation of the classifications of AR.

Risk Factors and Possible Confounding Variables of the Study

Allergens/IrritantsAllergens and irritants present in the environment are part of the confounding variables of the study.

One of the allergens that commonly trigger allergic rhinitis is pollen. In a cohort study conducted in

Sweden in 2003, it has been identified that pollen accounted for seventy-three percent (73%) of the

trigger factors that cause Allergic Rhinitis. [18] Moreover, the incidence of allergic disease has been

thought to be constantly increasing [19] and this has been attributed to the increased exposure of

children to air pollution, probably because of the presence of particulates in the air. [20]

Number of hours spent in air-conditioned rooms and non air-conditioned rooms

Since one of the objectives of the research is to see whether or not air-conditioned rooms can help

alleviate allergic rhinitis, the number of hours is a confounder to our study. A cross-sectional study

conducted in Taiwan shows that persistent exposure to nitric oxides, carbon monoxide, and sulfur

dioxide may increase the prevalence of allergic rhinitis in children. [21] This study suggests that, to a

certain extent, exposure to outdoor air pollutants may increase the risk of allergic rhinitis in children.

Condition of the room

The condition of the classroom, as will be surveyed upon implementation of the study, is a

confounding variable to this research because as already mentioned, allergens comprise a big part of

the triggers of allergic rhinitis. Dust from unwashed curtains, carpets, or table cloths can be

considered also as an allergen thus triggering a more severe allergic reaction. Furthermore, exposure

to chalk dust, especially in a poorly ventilated classroom, may also trigger allergic rhinitis of the

affected students.

Summary of Related/Similar Studies

According to Kutintara, allergic rhinitis (AR) is the most common of all allergic diseases. The prevalence,

which ranges from 4% to 40%, of this disease is spreading worldwide, including the Asia Pacific region.

It has a great impact on a persons daily life. 82% of AR sufferers in the United States reported that theyalways or usually have symptoms at work or school. It is responsible for about 2 million lost school-days


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each year in the United States and a significant large number of Thai children indicated that their allergy

symptoms were severe enough to limit their activities. [22]

There are currently no cures for allergic rhinitis. However, there are ways to treat the symptoms.These treatments include medication, immunotherapy, and avoidance. The most common medications for

allergic rhinitis are antihistamines, decongestants, and antihistamines-decongestant combinations.

Unfortunately, side effects are a main concern for taking medications. It was reported that 31% of patientsexperienced side effects from the medications and 65% of patients would not take some drugs because ofthe side effects. Allergen immunotherapy includes allergen vaccinations and periodic allergen shots tolessen a patients sensitivity to allergens. It is for those who do not respond to medications or have

adverse side effects from the medications. Although the immunotherapy can reduce allergy symptoms,

patients should still continue practicing allergen avoidance. Practicing allergen avoidance while receivingimmunotherapy can significantly enhance the effectiveness of the treatment against AR. [22]

Avoidance is the primary method in treating AR. Those with allergies can reduce their allergic

symptoms by reducing their exposure to allergens. This includes promoting a healthy indoor environment.The main allergens that are found indoors are allergens from dust mites, cockroaches, and molds. These

allergens can be avoided by knowing how to eliminate them. These allergens commonly survive in

environments that are warm, moist and humid. Dust mites cannot live in an environment that has arelative humidity of less than 50% while cockroaches and molds only thrive in areas of warmth and

humidity. Therefore, other than keeping an AR patients surrounding environment clean, it is also

recommended to have an air-conditioning system or proper ventilation system so that it can reduce theamount of allergens present in the patients environment by reducing the humidity and heat levels. [22]

In congruence with the aforementioned study, according to Zacharisen, a member and a fellow of

the American Academy of Asthma, Allergy, and Immunology, the key to reducing the severity of

symptoms a child experiences at school is avoidance of these allergens. If it is possible, parents should

talk to school personnel to make them aware of the allergy triggers of their children so as to avoid

aggravating their allergies.[23]

A study in Boston conducted by Blaisse stated that the symptoms of allergic rhinitis and the

adverse effects of medications taken can diminish or lessen the cognitive function and learning of

students. This can also affect the quality of student-life if aggravated. Whats unfortunate is that most

conditions are left under-diagnosed or under-treated because symptoms are often discounted by parents as

just allergies.[24]

The study further noted that aside from the loss of cognitive function in children with

moderate to severe AR, this can also cause irritability and fatigue leading to the inattentiveness and

difficulty in concentrating in school. One of the most important components of management, according

to the study, is to educate the patient and the family about avoiding the allergens that the children are

allergic to.

Another important thing to take note of is the environment of the school children in which they

will be exposed to. The most common allergens at school that may cause AR include dust mites, chalkdust, animal dander, pollen, molds, and even exercise.

[23]

In response to these circumstances, there are a number of therapies than can be undertaken by

children with AR. These include antihistamines, corticosteroids, leukotriene-receptor antagonists, mast

cell stabilizers, anticholinergics, and allergen-specific immunotherapy depending on whether the AR is

intermittent, persistent, severe, or mild. [24] It has been identified that second-generation antihistamines are

the more preferred treatment though it can produce some sedative effects.


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Oral and topical decongestants are also often used in addition with antihistamines. The only

disadvantage is that it cannot alleviate any other symptoms of AR such as itching and sneezing. It can

only alleviate the nasal decongestion experienced with AR. Another therapy mentioned is with the use of

corticosteroids and these corticosteroids usually act on the nasal mucosa (intranasal action) and treat most

of the symptoms of AR. This method is often recommended to children, especially those who present

with severe symptoms. However, systemic corticosteroids are not recommended to children because of itsserious side effects thus it should not be administered in chronic use. Leukotriene-receptor antagonists are

more effective antihistamines but less effective than the intranasal corticosteroids. Aside from minor side

effects such as headache and otitis media, it is generally safe for children and teenagers. Mast cell

stabilizers usually inhibit mast cell degranulation relieving the common symptoms of AR. However, the

disadvantage of this drug is that it has a short duration of action thus requiring more frequent doses.

Anticholinergics inhibit the production of nasal secretions but have no effects on other symptoms of

allergic rhinitis. The last therapy mentioned in the study is with the use of immunotherapy. This is the

only disease-modifying therapy for AR and it should only be considered for use to children with moderate

to severe allergies.[24]

Another study in Spain conducted by Jauregui et. al. states that AR is the most common chronicdisorder that affects the pediatric population.[26] Data shows that AR and rhinoconjunctivitis represent the

main cause of 55.5% of all patients seen in Spanish allergology clinics. Again, it is important to note that

a third of the population of 13-14 year-old teenagers suffer from the symptoms of AR. [27] It has been also

stated in the study that AR somehow impairs daily activities such as visual coordination, retention

capacity, and reaction time of students. [28]

The study also states that if the AR is untreated, school performance is also affected. AR causes

sleep disturbances, daytime sleepiness, absenteeism, presenteeism, irritability, restlessness, mood

disorders, and an altered social life. [26]

Sleep disturbances were caused by nasal congestion/blockade and also frequent awakeningsduring at night due to allergic inflammation. Presenteeism is the inattention, distraction, and lack of

attention of the students while inside the classroom due to the symptoms of AR. Obviously, one of the

main causes of learning difficulty and school failure is the students inability to concentrate due to

untreated ARgiven that it is in fact one of the most common chronic illnesses that hits children and

teenagers. [29]

Focusing on the building conditions wherein classrooms are situated, a study that concerns

transmission of airborne diseases was conducted in Peru. Rooms that only had natural measures for

encouraging airflow were compared with mechanically ventilated rooms that were built much more

recently. A comparison was also done between naturally ventilated rooms in old hospitals and naturally

ventilated rooms in newer hospitals. Results showed that natural ventilation had high rates of airexchange, with an average of 28 air changes per hour. 50 year old hospitals had the highest ventilation

with an average of 40 air changes per hour due to its structure. This rate is far higher compared to the 17

air changes per hour in naturally ventilated rooms in modern hospitals, which have lower ceilings and

smaller windows.[30]


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In a study about the impact of school building conditions on student absenteeism in Upstate New

York, researchers investigated this by obtaining data from the 2005 Building Condition Survey of Upstate

New York schools with 2005 New York State Education department students absenteeism data at the

individual school level and evaluated associations between building conditions and absenteeism at or

above the 90th percentile. As a result, researchers associated absenteeism with visible molds, humidity,

poor ventilation, vermin, building condition problems, and building system or structural problems relatedto these conditions. They also saw that schools in lower socioeconomic districts and schools attended by

younger students showed the strongest association between poor building conditions and absenteeism.

With this study, there were some limitations. Some confounding variables were the external exposures

such as traffic pollution and exposures from a students home could have affected this study. In addition,

absenteeism due to illness or other reasons could not be distinguished. The study's ecological design did

not allow collection of information on individual health outcomes or reasons for absenteeism. In

conclusion, they found associations between student absenteeism and adverse school building conditions.

As a recommendation, further studies should confirm these findings and prioritize strategies for school

condition improvements.[3]

Conceptual Framework:

Exposure Variable Disease Variable

Figure 2. Conceptual framework of proposed study.

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Decreased Severity of Allergic

Rhinitis and alleviation of symptomsExposure to Air-

conditioning System

Number of hours

s ent in classroomConfoundersAllergens/Irritants

such as pollen, molds,

cockroaches, dust

collecting furniture,

and chalk dust


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