A young
boy usually scratches the eyes with watery secretions anytime he resumes at the
boarding school; the itching used to be so bad that he normally ends up with
red eyes and severe nasal secretions. On a particular day he sneezes for over 1
hour and was excused from the classroom. The parents were called to pick up the
boy. This has badly affected the boy’s performance since he is not always comfortable in the classroom. This
is just one in many cases of allergic reactions, other includes allergic skin
conditions,atopic dermatitis,ulticaria rash etc
Allergy
is defined as an immune-mediated inflammatory response to common environmental
allergens that are otherwise harmless.s
Allergic
diseases include allergic rhinitis and asthma; food and stinging insect
allergies leading to anaphylaxis; and allergic dermatitis, Urticaria rash,
eczema and allergic rhinitis.
The manifestation of allergic diseases changes
throughout life: food allergies and eczema are most likely to develop in
infants, asthma in young children, and rhinitis in older children and adults
Things
that people are commonly allergic to include: Tree and grass pollens, house
dust mite., animals, especially domestic pets such as cats and dogs. insect
venom such as that contained in wasp and bee stings, medicines, foods, such as
nuts and eggs, chemicals such as latex.
SYMPTOMS
Rhinitis (inflammation of the nose). This
causes runny nose or nasal congestion and sneezing.
Conjunctivitis (inflammation of the eyes). This leads to
watering, itching and a hot feeling in the eyes.
Skin rashes. The typical allergic rash is an urticarial rash -
also known as hives or nettle rash. It is very itchy. Flushing of the skin is
also common.
Angio-oedema. This is swelling of the tissues, and can include
the lips, tongue, throat and eyelids. It can start with a tingling feeling.
Angio-oedema is potentially very serious, as airway obstruction can occur (and
so breathing might stop). People might have difficulty talking or swallowing.
Breathing difficulties. This includes wheezing, chest tightness and
breathlessness, and can occur in severe allergic reactions and anaphylaxis. It
can be life-threatening.
Cardiovascular collapse. This can cause death. It is the
end stage of anaphylaxis. The chemicals released by the body in an extreme
allergic reaction can make blood pressure drop dramatically. This can lead to loss
of consciousness and to cardiac arrest (the heart stops). Resuscitation is
required.
Other symptoms. These can include a sense of impending doom,
abdominal pain, nausea and vomiting, and palpitations.
Skin
prick testing
Blood
specific IgE : It can be used to
diagnose all types of allergies, but is generally less sensitive than skin
prick testing.
Careful
avoidance of the specific allergens: This is the primary form of treatment for
food allergies and some stinging insect allergies, as avoidance can be a very
effective strategy if patients are well educated about precautionary measures.
The most
effective methods for primary prevention of allergic disease in children that can
currently be recommended is breastfeeding.
TREATMENT
There is
increasing evidence that appropriate treatment of allergies can prevent and
alter the natural history of allergic diseases.
Patients
with intermittent symptoms are often treated adequately with oral
antihistamines.
Short
courses of oral corticosteroids may also provide relief.
Daily
use of an antihistamine, decongestant, or both can be considered
Ocular
antihistamine drops (for eye symptoms).
Intranasal antihistamine sprays for rhinitis
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