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  2. List of ICD-9 codes 800–999: injury and poisoning - Wikipedia

    en.wikipedia.org/wiki/List_of_ICD-9_codes_800...

    995.27 Other drug allergy; 995.29 Unspecified adverse effect of other drug, medicinal and biological substance; 995.3 Allergy, unspec. 995.4 Shock due to anesthesia not elsewhere classified; 995.5 Child abuse, unspec. 995.55 Shaken infant syndrome; 995.6 Anaphylactic shock due to adverse food reaction. 995.60 Anaphylactic shock due to ...

  3. Pseudoallergy - Wikipedia

    en.wikipedia.org/wiki/Pseudoallergy

    Pseudoallergy, sometimes known as nonallergic hypersensitivity, is a type of hypersensitivity reaction mostly described in the context of drug allergy.The mechanism is somewhat similar to the type 1 hypersensitivity in the Gell and Coombs classification in that the effector cell is also mast cell.

  4. Anaphylaxis - Wikipedia

    en.wikipedia.org/wiki/Anaphylaxis

    Anaphylactoid reaction, non-immune anaphylaxis, or pseudoanaphylaxis, is a type of anaphylaxis that does not involve an allergic reaction but is due to direct mast cell degranulation. [ 10 ] [ 42 ] Non-immune anaphylaxis is the current term, as of 2018, used by the World Allergy Organization [ 42 ] with some recommending that the old ...

  5. Mast cell activation syndrome - Wikipedia

    en.wikipedia.org/wiki/Mast_cell_activation_syndrome

    Mast cell activation syndrome (MCAS) is a term referring to one of two types of mast cell activation disorder (MCAD); the other type is idiopathic MCAD. [1] MCAS is an immunological condition in which mast cells, a type of white blood cell, inappropriately and excessively release chemical mediators, such as histamine, resulting in a range of chronic symptoms, sometimes including anaphylaxis or ...

  6. Drug allergy - Wikipedia

    en.wikipedia.org/wiki/Drug_allergy

    A drug allergy is an allergy to a drug, most commonly a medication, and is a form of adverse drug reaction. Medical attention should be sought immediately if an allergic reaction is suspected. An allergic reaction will not occur on the first exposure to a substance.

  7. Angioedema - Wikipedia

    en.wikipedia.org/wiki/Angioedema

    The version related to histamine is due to an allergic reaction to agents such as insect bites, foods, or medications. [1] The version related to bradykinin may occur due to an inherited problem known as C1 esterase inhibitor deficiency, medications known as angiotensin-converting enzyme inhibitors, or a lymphoproliferative disorder. [1]

  8. Bronchospasm - Wikipedia

    en.wikipedia.org/wiki/Bronchospasm

    Bronchospasms occur in asthma, chronic bronchitis and anaphylaxis. Bronchospasms are a possible side effect of some drugs: pilocarpine, beta blockers (used to treat hypertension), a paradoxical result of using LABA drugs (to treat COPD), and other drugs. Bronchospasms can present as a sign of giardiasis.

  9. Mosquito bite allergy - Wikipedia

    en.wikipedia.org/wiki/Mosquito_bite_allergy

    Mosquito bite allergies are informally classified as 1) the skeeter syndrome, i.e., severe local skin reactions sometimes associated with low-grade fever; 2) systemic reactions that range from high-grade fever, lymphadenopathy, abdominal pain, and/or diarrhea to, very rarely, life-threatening symptoms of anaphylaxis; and 3) severe and often ...