| Allergic Child | ||
Christopher A. Smith
| Database Differential Diagnosis Data Gathering Physical Examination Laboratory Aids Emergency Care Common Questions and Answers Bibliography |
| DATABASE | ||
DEFINITION
The allergic child has the tendency toward IgE mediated reactions in response to pollens, molds, environmental allergens, drugs, or foods. These reactions may manifest as any of the following: eczema, allergic rhinitis, asthma, angioedema, hives, or anaphylaxis. These children may have dark circles under their eyes (allergic shiners), a nasal crease, or the child may give you an allergic salute (upward rubbing of nose to relieve a nasal itch). A careful environmental history is essential. The history may reveal seasonal or year round symptoms.
| DIFFERENTIAL DIAGNOSIS | ||
EYES
NOSE
LUNGS
SKIN
| DATA GATHERING | ||
HISTORY
Specific questions are best asked systematically in a review of systems format.
Ears
Nasal
Throat
Chest
Eyes
Gastrointestinal
Skin
Genitourinary
Headache
Other important questions include:
Question: Does your child have food or drug
allergies?
Significance: Be sure to ask what type of reaction the
child had (many types of intolerances are called allergies by parents).
Generally, allergies are IgE mediated reactions resulting in wheezing, allergic
rhinitis, hives, angioedema, eczema, or anaphylaxis. Intolerances generally
include a non-specific rash, diarrhea, gas, headache, or hyperactivity.
Specifically ask about peanut, nut, and shellfish allergy (allergy to any of
these is an indication for an EpiPen (Center Labs, Port Washington, NY), and
life-long avoidance).
Question: Has your child ever been stung by a bee, and, if so, what
was the reaction?
Significance: Systemic reactions are an indication
for referral to an allergist for venom desensitization. Venom desensitization
can be potentially lifesaving. Ask the parent if they know the type of bee
involved with the reaction. (Honey bees are the only bees that leave their
stinger at the sting site.)
Question: Does anyone in your family have hayfever (allergic
rhinitis), asthma, or eczema?
Significance: Familial history of atopy
increases the likelihood of atopy in other family members.
Questions to ask regarding the environment:
Question: Do you have a basement?
Significance: Damp
basements are a source of mold spores.
Question: Are there any damp areas in your
home?
Significance: Damp areas serve to propagate mold growth in the
home.
Question: Do you have forced air or radiator
heat?
Significance: Forced air heat tends to blow allergen laden dust
around the home.
Question: How do you cool your home?
Significance: Opening
outside windows lets the pollens from outside into the house.
Question: Do you have a humidifier?
Significance: Molds can
grow in the water, and increased ambient humidity will raise the dust mite
population in the home.
Question: Are there any smokers in the home?
Significance:
Cigarette smoke is an airway irritant and can exacerbate respiratory
difficulties.
Question: Are there any pets in the home, at school, or in
daycare?
Significance: Animal dander is a common aeroallergen. Pets
should be excluded from the bedroom (a pet that sleeps on the patient's bed is a
common problem).
Question: Are there many stuffed animals or books in the
bedroom?
Significance: Dust mites love these dust collectors, and they
should be removed from the bedroom. Environmental control efforts should be
focused on the bedroom. Patients can have significant allergen exposure during
sleep.
Question: Does the bedroom have carpeting?
Significance:
Hardwood or tile floors are best to keep the dust mite population under
control.
Question: How often do you wash the bedding, what type of pillow do
you have, and is the mattress encased in plastic?
Significance: To
keep the dust mite population under control the bedding should be washed in hot
water at least once every two weeks (hot water kills dust mites), the pillow
should be fiber filled, and the mattress should be encased in plastic.
Question: Where does the patient spend most of his
time?
Significance: Allergenic exposure where most of the patient's
time is spent is most important.
Question: Does the patient attend daycare?
Significance:
Daycare is a major source of upper respiratory tract infections, which can mimic
allergies and exacerbate reactive airway disease.
| PHYSICAL EXAMINATION | ||
A complete physical examination is essential to rule out systemic disease that can mimic allergies (i.e., clubbing, anatomic obstruction, heart murmur, etc.)
Finding: Ocular allergic signs
Significance:
Finding: Nasal allergic signs
Significance:
Finding: Ears allergic signs
Significance: Fluid in the
middle ear, or retracted tympanic membranes may be associated with eustachian
tube dysfunction seen with allergic inflammation.
Finding: Throat allergic signs
Significance: Cobblestoning
of posterior pharynx secondary to submucosal lymphoid hyperplasia can be seen in
allergic patients.
Finding: Lungs allergic signs
Significance: Wheezes,
rhonchi, decreased air entry, and chronic obstruction can be secondary to
allergic responses.
Finding: Skin allergic signs
Significance: Eczema, hives,
angioedema, and dermatographism are all characteristic of allergic
skin.
| LABORATORY AIDS | ||
Test: Immediate
hypersensitivity
Significance:
Test: Baseline laboratory
Significance: Baseline pulmonary
function studies should be obtained on asthmatic children.
| EMERGENCY CARE | ||
ANAPHYLAXIS
ACUTE ASTHMA
| COMMON QUESTIONS AND ANSWERS | ||
Q: Do children outgrow allergies?
A: No. Actually, once a
patient is sensitized they are sensitized for life. In addition, the older the
patient becomes the greater the chance to develop other sensitivities.
Q: Can allergic children acquire more allergies?
A: Allergic
children have the biologic potential to become sensitized to many environmental
allergens. The goal should be to limit exposure to these antigens to prevent
sensitization.
Q: If a parent is allergic to a specific allergen can the child
inherit this allergy?
A: Children inherit the tendency to be allergic,
but they do not inherit specific allergies.
Q: What treatments are available?
A: Specific environmental
control (as determined by skin testing), antihistamines, topical steroids, and
immunotherapy.
Issues for Referral
| BIBLIOGRAPHY | ||
Fireman P. Diagnosis of allergic disorders. Pediatr Rev 1995;16(5):178–183.
Hopkin JM. Asthma and allergy-disorders of civilization? QJM 1998;91(3):169–170.
Middleton E, Reed CE, Adkinson NF, Yunginger JW, Busse WW. Allergic principles and practice, 4th ed. Philadelphia: Mosby, 1993.
Sites DP, Terr AI, Parslow TG. Basic and clinical immunology, 8th ed. Englewood Cliffs, NJ: Prentice Hall, 1994.
Copyright
© 2000 Lippincott Williams & Wilkins
M. William
Schwartz, Louis M. Bell, Jr., Peter M. Bingham, Esther K. Chung, David F.
Friedman and Andrew E. Mulberg, The 5 Minute Pediatric Consult