Case History: A 5 year old boy is stung by a bee while playing in the garden. He suddenly developed facial puffiness and was brought into the hospital.. Which of the following immunoglobulin mediated the reaction in this boy?
Answer: Immunoglobulin E (IgE) binds to the foreign material that provokes the allergic reaction(Antigen). This Antigen-bound IgE then activates FcεRI receptors on mast cells and basophils. This causes release of histamine. Histamine increases the contraction of bronchial smooth muscles, triggers vasodilation, increases the leakage of plasma from blood vessels and also cause cardiac muscle depression.
If you’ve had a reaction to bee stings that suggests you might be allergic to bee venom, your doctor may suggest one or both of the following tests:
- Skin test. During skin testing, a small amount of allergen extract (in this case, bee venom) is injected into the skin of your arm or upper back. This test is safe and won’t cause any serious reactions. If you’re allergic to bee stings, you’ll develop a raised bump on your skin at the test site.
- Allergy blood test. A blood test can measure your immune system’s response to bee venom by measuring the amount of allergy-causing antibodies in your bloodstream. A blood sample is sent to a medical laboratory, where it can be tested for evidence of sensitivity to possible allergens.
Allergy skin tests and allergy blood tests are often used together to diagnose insect allergies. Your doctor may also want to test you for allergies to yellow jackets, hornets and wasps — which can cause allergic reactions similar to those of bee stings.
Removing a bee’s stinger
For ordinary bee stings that do not cause an allergic reaction, home treatment is enough. Multiple stings or an allergic reaction, on the other hand, can be a medical emergency that requires immediate treatment.
Emergency treatment for allergic reactions
During an anaphylactic attack, an emergency medical team may perform cardiopulmonary resuscitation (CPR) if you stop breathing or your heart stops beating. You may be given medications including:
- Epinephrine (adrenaline) to reduce your body’s allergic response
- Oxygen, to help you breathe
- Intravenous (IV) antihistamines and cortisone to reduce inflammation of your air passages and improve breathing
- A beta agonist (such as albuterol) to relieve breathing symptoms
If you’re allergic to bee stings, your doctor is likely to prescribe an emergency epinephrine autoinjector (EpiPen, Auvi-Q, others). You’ll need to have it with you at all times. An autoinjector is a combined syringe and concealed needle that injects a single dose of medication when pressed against your thigh. Always be sure to replace epinephrine by its expiration date.
Be sure you know how to use the autoinjector. Also, make sure the people closest to you know how to administer the drug — if they’re with you in an anaphylactic emergency, they could save your life. Medical personnel called in to respond to a severe anaphylactic reaction also may give you an epinephrine injection or another medication.
Consider wearing an alert bracelet that identifies your allergy to bee or other insect stings.
Bee and other insect stings are a common cause of anaphylaxis. If you’ve had a serious reaction to a bee sting or multiple stings, your doctor likely will refer you to an allergist for allergy testing and consideration of allergy shots (immunotherapy). These shots, generally given regularly for a few years, can reduce or eliminate your allergic response to bee venom.
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