Allergic Child The 5 Minute Pediatric Consult
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

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