reaction /re·ac·tion/ (-ak´shun)
Allergic reaction
allergic reaction,
allergic reaction,
allergic reaction
Patient discussion about allergic reaction.
1. opposite action, or counterreaction; the response to stimuli.
2. a phenomenon caused by the action of chemical agents; a chemical process in which one substance is transformed into another substance or other substances.
3. the mental and/or emotional state that develops in any particular situation.
acrosome reaction structural changes and liberation of acrosomal enzymes occurring in spermatozoa in the vicinity of an oocyte, facilitating entry into the oocyte.
alarm reaction the physiologic effects (increase in blood pressure, cardiac output, blood flow to skeletal muscles, rate of glycolysis, and blood glucose concentration; decrease in blood flow to viscera) mediated by sympathetic nervous system discharge and release of adrenal medullary hormones in response to stress, fright, or rage.
allergic reaction hypersensitivity r., sometimes specifically a type I hypersensitivity reaction.
anaphylactic reaction anaphylaxis.
anaphylactoid reaction one resembling generalized anaphylaxis but not caused by IgE-mediated allergic reaction.
antibody-mediated hypersensitivity reaction
1. type II hypersensitivity r.; see Gell and Coombs classification, under classification.
2. occasionally, any hypersensitivity reaction in which antibodies are the primary mediators, i.e., types I–III.
antigen-antibody reaction the reversible binding of antigen to homologous antibody by the formation of weak bonds between antigenic determinants on antigen molecules and antigen binding sites on immunoglobulin molecules.
anxiety reaction a reaction characterized by abnormal apprehension or uneasiness; see also anxiety disorders, under disorder.
Arias-Stella reaction nuclear and cellular hypertrophy of the endometrial epithelium, associated with ectopic pregnancy.
cell-mediated hypersensitivity reaction type IV hypersensitivity r.; see Gell and Coombs classification, under classification.
conversion reaction see under disorder.
cross reaction the interaction of an antigen with an antibody formed against a different antigen with which the first antigen shares identical or closely related antigenic determinants.
cytotoxic hypersensitivity reaction type II hypersensitivity r.; see Gell and Coombs classification, under classification.
defense reaction see under mechanism.
delayed hypersensitivity reaction , delayed-type hypersensitivity reaction that taking 24 to 72 hours to develop and mediated by T lymphocytes rather than by antibodies; usually denoting the subset of type IV hypersensitivity reactions involving cytokine release and macrophage activation, as opposed to direct cytolysis, but sometimes used more broadly, even as a synonym for type IV hypersensitivity r. (see Gell and Coombs classification, under classification ).
reaction of degeneration the reaction to electrical stimulation of muscles whose nerves have degenerated, consisting of loss of response to a faradic stimulation in a muscle, and to galvanic and faradic stimulation in the nerve.
foreign body reaction a granulomatous inflammatory reaction evoked by the presence of exogenous material in the tissues, characterized by the formation of foreign body giant cells.
hemiopic pupillary reaction in certain cases of hemianopia, light thrown upon one side of the retina causes the iris to contract, while light thrown upon the other side arouses no response.
Herxheimer's reaction Jarisch-Herxheimer r.
hypersensitivity reaction one in which the body mounts an exaggerated or inappropriate immune response to a substance perceived as foreign, resulting in local or general tissue damage. Such reactions are usually classified as types I–IV on the basis of the Gell and Coombs classification (q.v.).
id reaction a secondary skin eruption occurring in sensitized patients as a result of circulation of allergenic products from a primary site of infection.
immediate hypersensitivity reaction
1. type I hypersensitivity r.; see Gell and Coombs classification, under classification.
2. occasionally, any hypersensitivity reaction mediated by antibodies and developing rapidly, generally in minutes to hours (i.e., types I–III ), as distinguished from those mediated by T lymphocytes and macrophages and requiring days to develop (type IV, or delayed hypersensitivity r. ).
immune reaction see under response.
immune complex–mediated hypersensitivity reaction type III hypersensitivity r.; see Gell and Coombs classification, under classification.
Jarisch-Herxheimer reaction a transient immunologic reaction following antibiotic treatment of early and later stages of syphilis and certain other diseases, marked by fever, chills, headache, myalgia, and exacerbation of cutaneous lesions; due to release of toxic or antigenic substances by the infecting microorganisms.
Jones-Mote reaction a mild skin reaction of the delayed (type IV) hypersensitivity type occurring after challenge with protein antigens.
late phase reaction an IgE-mediated immune reaction occurring 5 to 8 hours after exposure to antigen, after the wheal and flare reactions of immediate hypersensitivity have diminished, with inflammation peaking around 24 hours, and then subsiding.
lengthening reaction reflex elongation of the extensor muscles which permits flexion of a limb.
leukemoid reaction a peripheral blood picture resembling that of leukemia or indistinguishable from it on the basis of morphologic appearance alone; seen in certain infectious diseases, inflammatory conditions, and intoxications.
Neufeld's reaction swelling of the capsules of pneumococci, seen under the microscope, on mixture with specific immune serum, owing to the binding of antibody with the capsular polysaccharide.
oxidation-reduction reaction redox r.
Pirquet reaction appearance of a papule with a red areola 24 to 48 hours after introduction of two small drops of Old tuberculin by slight scarification of the skin; a positive test indicates previous infection.
polymerase chain reaction (PCR) a rapid technique for in vitro amplification of specific DNA or RNA sequences, allowing small quantities of short sequences to be analyzed without cloning.
precipitin reaction the formation of an insoluble precipitate by reaction of antigen and antibody.
redox reaction a reaction oxidizing one substrate while reducing another.
Schultz-Charlton reaction disappearance of scarlet fever rash around the site of an injection of scarlet fever antitoxin.
serum reaction seroreaction.
startle reaction the various psychophysiological phenomena, including involuntary motor and autonomic reactions, evidenced by an individual in reaction to a sudden, unexpected stimulus, as a loud noise.
stress reaction any physiological or psychological reaction to physical, mental, or emotional stress that disturbs the organism's homeostasis.
T cell–mediated hypersensitivity reaction type IV hypersensitivity r.; see Gell and Coombs classification, under classification.
Weil-Felix reaction agglutination by blood serum of typhus patients of a bacillus of the proteus group from the urine and feces.
Wernicke's reaction hemiopic pupillary r.
wheal and erythema reaction , wheal and flare reaction a cutaneous sensitivity reaction to skin injury or administration of antigen, due to histamine production and marked by edematous elevation and erythematous flare.
| allergic reaction n. A local or generalized reaction of an organism to internal or external contact with a specific allergen to which the organism has been previously sensitized. |
Allergic reaction
An inappropriate or exaggerated genetically determined reaction to a chemical that occurs only on the second or subsequent exposures to the offending agent, after the first contact has sensitized the body.
Mentioned in: Dermatitis, Eyelid Disorders
allergic reaction,
an unfavorable physiologic response to an allergen to which a person has previously been exposed and to which the person has developed antibodies. The response may be characterized by a variety of symptoms, including urticaria, eczema, dyspnea, bronchospasm, diarrhea, rhinitis, sinusitis, laryngospasm, and anaphylaxis. Allergic reactions may be immediate or delayed. Eosinophilia is usually present and is revealed in the differential white blood cell count.
allergic reaction,
n aggravated immune system response to a variety of environmental and other substances, both chemical or organic. Reactions may be mild to life-threatening and include urticaria, eczema, dyspnea, bronchospasm, diarrhea, rhinitis, sinusitis, laryngospasm, and anaphlaxis.
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Allergic reaction.
allergic
pertaining to or caused by allergy.
allergic alveolitis
allergic breakthrough
a theory which attributes temporary increases in clinical severity of atopy to influences, such as concurrent disease or hormonal variations, acting to inhibit the mechanisms which normally regulate production of IgE at low levels following sensitization.
allergic bronchitis
allergic contact dermatitis
results from percutaneous sensitization to allergens, usually haptens, that form covalent bonds with epidermal proteins, and the development of a delayed (type IV) hypersensitivity. Lesions typically correspond in location to the area of contact between allergen and skin which in animals is often in relatively hairless areas unless the allergen is presented in liquid form.
allergic dermatitis
inflammation of the skin resulting from exposure to antigens to which the animal is hypersensitive. Usually involving immediate (type I) hypersensitivity but also commonly applied to reactions involving delayed (type IV) hypersensitivity. The specific skin reaction, lesions and pattern of disease produced depend on many factors including the type of allergen and immune mechanism, route of exposure and species differences. See also atopy, sweet itch, allergic contact dermatitis (above).
allergic encephalitis
see experimental allergic encephalomyelitis.
equine allergic dermatitis
an intensely itchy dermatitis along the back of horses caused by sensitivity to the bites of the sandfly Culicoides brevitarsus and possibly other insects. Called also sweet itch, Queensland itch.
allergic inhalant dermatitis
see atopy.
allergic reaction
an immune-mediated, adverse clinical response, following the inhalation, ingestion or injection of an antigen by a sensitized animal. Manifestations include urticaria or anaphylaxis.
allergic urticaria
see urticaria.
allergic reaction
Immunology Any response to an allergic stimulus, which can be localized or systemic Clinical Rash, itching, hives, swelling, dyspnea, ↓ BP Lab ↑ IgE, ↑ mast cells, basophils, which release histamine, PGs, LTs,
kinins, et al. See Asthma, Hypersensitivity reaction.
Patient discussion about allergic reaction.
Q. I am worried about the allergic reactions I had from the Chinese herbal drug. I am worried about the allergic reactions I had from the Chinese herbal drug that I took for my arthritis…..are these safe?
A. Many people have some type of reaction to either a drug and even a supplement. You can check with your doc to get tested to see what your sensitivities are. Regarding arthritis, no milk, cheese, yogurt, butter, anything with milk for starters, AVOID like the plague! Suagr consumption too will raise hell with it. There is a product that someone I knew took, called, "Cell Guard" which he bought at a health food store or Whole Foods. After a couple of months, he was pain free. Its worth a try! Cell Guard is made with SOD or "superoxide dismutase"
Studies have shown that SOD can play a critical role in reducing internal inflammation and lessening pain associated with conditions such as arthritis! Check it out! Let me know how you do!
Studies have shown that SOD can play a critical role in reducing internal inflammation and lessening pain associated with conditions such as arthritis! Check it out! Let me know how you do!
Q. How long does it take for an allergy to occur after eating a food? Ok, I am allergic to peppers, each time I get an allergic reaction it takes longer and longer for the allergy to occur last time it was nearly 10 hours after eating the food this time it was 17 hours after eating the food. Is this even possible? I thought reactions occurred at max 4-6 hours after eating the food
A. i have a LOT of allergies. i am allergic to nuts very bad and i ate a chocolate with a nut in that a didn't notice, 10 seconds after digesting gave me a bad feeling in my throat and a few more seconds later i was violently sick and couldn't breathe very well and needed to call an ambulance 10 seconds later. i think its how bad the allergy, the quicker it starts to take effect.
Q. Can an allergic reaction to food cause an asthma attack?
A. i'm sorry- my mistake. i looked it up and it can be caused by atopic allergy too. called food induced asthma. thanks for letting me know!
http://www.ncbi.nlm.nih.gov/pubmed/17523696?ordinalpos=6&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
Read more or ask a question about allergic reactionhttp://www.ncbi.nlm.nih.gov/pubmed/17523696?ordinalpos=6&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
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