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Anaphylactic reaction; Anaphylactic shock; Shock – anaphylactic
Anaphylaxis is a severe, sometimes life-threatening, allergic reaction that occurs within minutes of exposure an allergy-causing substance (allergen). Anaphylaxis also is called anaphylactic shock.
In a severe allergic reaction, the body’s immune system responds to the presence of an allergen by releasing histamine and other body chemicals. These chemicals cause the symptoms of allergies, which are usually mild but annoying, such as the runny nose of hay fever (allergic rhinitis) or the itchy rash of poison ivy. However, in some cases, the symptoms can be much worse and involve the entire body. Anaphylaxis is the most severe allergic reaction. In anaphylaxis, these immune chemicals cause serious skin symptoms, such as hives and swelling, as well as severe breathing problems, such as swelling in the throat, narrowing of the lower airways and wheezing). The chemicals also cause blood vessels to widen dramatically, which leads to a rapid, severe drop in blood pressure (shock). Anaphylaxis is a life-threatening medical emergency.
Although the specific allergen that triggers anaphylaxis may be different for each patient, it often can be traced to one of the following sources:
Foods â€” Especially eggs, seafood, nuts, grains, milk and peanuts
Drugs â€” Especially an antibiotic from the penicillin or cephalosporin group
Insect stings â€” From bees, yellow jackets, paper wasps, hornets or fire ants
Injected anesthetics â€” Procaine, lidocaine
Dyes â€” Used in diagnostic X-rays and scans
Industrial chemicals â€” Latex and rubber products used by health care workers
Allergy shots (immunotherapy)
Symptoms of anaphylaxis usually occur within seconds to minutes of exposure to the allergen and range from mild to very severe. These symptoms include:
Rapid pulse, sweating, dizziness, fainting, unconsciousness
Wheezing, chest tightness, difficulty breathing, coughing
Itchy hives, which may blend together to form larger areas of skin swelling
Swelling of the lips, tongue or eyes
Nausea, vomiting, abdominal cramps, diarrhea
Paleness, bluish skin color
Throat swelling, with a feeling of throat tightness, a lump in the throat, hoarseness or obstructed air flow.
Abnormal (high-pitched) breathing sounds
Rapid or weak pulse
Blueness of the skin (cyanosis), including the lips or nail beds
Fainting, light-headedness, dizziness
Hives and generalized itching
Sensation of feeling the heart beat (palpitations)
Abdominal pain or cramping
The doctor will ask about the patient’s allergy history and about his or her exposure to any of the common allergens that trigger anaphylaxis. It is very important for the doctor to know if the patient’s symptoms started soon after exposure to an allergen, for instance after eating nuts, after a bee sting or after taking an antibiotic. Because the patient may be too sick to provide this information, a family member, friend, co-worker or school nurse will need to help. People with a history of severe allergic reactions should consider wearing a medical alert identification necklace or bracelet to save valuable time in identifying the problem.
The doctor usually can diagnose anaphylaxis based on the patient’s history and the results of a physical examination.
With early and appropriate treatment, cases of anaphylaxis can improve quickly within a few hours. If a person has already developed the more serious symptoms and dangerous conditions, it may take a few days to recover after treatment. If untreated, anaphylaxis can cause death within minutes to hours.
You can prevent anaphylaxis by avoiding the allergens that trigger your symptoms. For example, people with food allergies should always check the list of ingredients on food labels, and they should always ask the waiter about food ingredients before eating at a restaurant. If you are allergic to bee stings, you should limit gardening and lawn mowing, and you should not wear perfumes, hair sprays or bright clothing that attracts insects.
People with a history of anaphylaxis should wear a medical identification bracelet or necklace to alert others in the event of another reaction. In addition, ask your doctor if you should carry a pre-loaded syringe of epinephrine (adrenaline), a medicine used to treat anaphylaxis. At the first sign of symptoms, you or a competent helper (family member, co-worker, school nurse) would inject the pre-loaded epinephrine to treat your allergic reaction until you reach medical attention.
Allergy shots, also called immunotherapy, are used to gradually desensitize patients to insect allergies. On rare occasions, allergy shots also can be used to prevent certain medication allergies. However, they cannot prevent food allergies.
Signs and tests
Examination of the skin may show hives and swelling of the eyes or face. The skin may be blue from lack of oxygen or may be pale from shock. Angioedema in the throat may be severe enough to block the airway.
Listening to the lungs with a stethoscope may reveal wheezing or indicate fluid (pulmonary edema). The pulse is rapid, and blood pressure may be low. Weakness, pale skin, heart arrhythmias, mental confusion, and other signs may indicate shock.
Testing for the specific allergen that caused anaphylaxis (if the cause is not obvious) is postponed until after treatment.
Some early cases of anaphylaxis can be treated with antihistamines and corticosteroids. More severe cases can be life-threatening emergencies and require immediate medical attention. If available, epinephrine should be given at the first sign of a serious reaction to slow the progression of symptoms. Doctors treat anaphylaxis with the medication epinephrine and with intravenous fluids. The person also may need additional treatment with oxygen, mechanical ventilation (a machine helps the patient breathe temporarily), and additional medications such as antihistamines or corticosteroids given intravenously (into a vein).
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Cardiac arrest (no effective heartbeat)
Respiratory arrest (absence of breathing)
When To Call A Professional
Call for emergency assistance immediately whenever anyone has symptoms of anaphylaxis. If you have a history of severe allergic reaction and have not mentioned this to your doctor, schedule an appointment as soon as possible. He or she can review your history and help you take the necessary precautions to avoid future problems.
With prompt, appropriate treatment, most patients who have had a severe allergic reaction can recover completely. Unfortunately, even with treatment, some people die from anaphylaxis.
A person who has had anaphylaxis is at risk of future severe reactions if he or she is exposed again to the same allergen.
Disclaimer: This information is not meant to be a substitute for professional medical advise or help. It is always best to consult with a Physician about serious health concerns. This information is in no way intended to diagnose or prescribe remedies.
Help taken from:www.intelihealth.com and www.healthline.com