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anaphylaxis    
n. 过敏性反应

过敏性反应

anaphylaxis
n 1: hypersensitivity reaction to the ingestion or injection of
a substance (a protein or drug) resulting from prior
contact with a substance

anaphylaxis \an`a*phy*lax"is\ n.
([a^]n`[.a]*f[imac]*l[a^]k"s[i^]s or
[a^]n`[.a]*f[i^]*l[a^]k"s[i^]s)
1. [Gr. 'ana` back, way from fy`laxis security,
protection.]

1. (Med.) Hypersensitivity (to a foreign antigen) resulting
from prior contact with the same or a related substance.
[WordNet 1.5 AS]

2. (Med.) An immediate but transient systemic reaction to an
antigenic substance to which a person has become
hypersensitized; it is characterized by the contraction of
smooth muscle and capillary dilation. --[Stedman]
[PJC AS]

Note: The cascade of events is triggered by binding of the
foreign antigen to immunoglobulin E and release of
mediators such as histamine, bradykinin, serotonin, and
slow-reacting substance from mast cells. It involves
more than one organ system. The most commonly involved
organs are skin, cardiovascular, respiratory and
gastrointestinal systems. Anaphylaxis is manifested by
a range of signs and symptoms including pruritus,
urticaria, itching, dyspnea, abdominal pain and
cardiovascular collapse (shock). A severe form of the
reaction is called {anaphylactic shock}. --[Stedman]
[PJC AS]

3. (Med) Anaphylactic shock.
[AS]


anaphylactic shock \anaphylactic shock\ n.
([a^]n`[.a]*f[imac]*l[a^]k"t[i^]k sh[o^]k`) (Med.)
Shock resulting from anaphylaxis[2]. It is a severe form of
physiological shock, often having a fatal outcome, and is
caused by an extreme immunological reaction to antigens. It
is characterized by smooth muscle contraction and capillary
dilation throughout the body, initiated by antibodies of the
IgE class. It is usually seen when an antigen to which a
person has become hypersensitized is injected intravenously
or subcutaneously. It is also called {generalyzed
anaphylaxis} or {systemic anaphylaxis}, and sometimes
{anaphylaxis}. --[Stedman]
[PJC AS]


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  • Anaphylaxis - Symptoms causes - Mayo Clinic
    Anaphylaxis causes the immune system to release a flood of chemicals that can cause you to go into shock — blood pressure drops suddenly and the airways narrow, blocking breathing Signs and symptoms include a rapid, weak pulse; a skin rash; and nausea and vomiting
  • Anaphylaxis - Diagnosis treatment - Mayo Clinic
    Anaphylaxis, a severe allergic reaction, is an emergency Learn who's at risk, what to watch for and what to do when it occurs
  • Anaphylaxis: First aid - Mayo Clinic
    A life-threatening allergic reaction called anaphylaxis can cause shock, a sudden drop in blood pressure and trouble breathing In people who have an allergy, anaphylaxis can happen minutes after exposure to a specific allergy-causing substance, called an allergen
  • Anafilaxia - Síntomas y causas - Mayo Clinic
    La anafilaxia, reacción alérgica grave, es una urgencia Obtén información sobre quiénes están en riesgo, a qué prestar atención y qué hacer cuando ocurre
  • 严重过敏反应 - Symptoms causes - Mayo Clinic
    Shaker MC, et al Anaphylaxis — A 2020 practice parameter update, systematic review, and Grading of Recommendations, Assessment, Development and Evaluation (GRADE) analysis Journal of Allergy and Clinical Immunology 2020; doi:10 1016 j jaci 2020 01 017
  • Anafilaxia: primeros auxilios - Mayo Clinic
    American Academy of Allergy, Asthma and Immunology https: www aaaai org conditions-treatments allergies anaphylaxis Accessed June 7, 2022 McHugh K, et al Anaphylaxis: Emergency department treatment
  • Allergies - Symptoms and causes - Mayo Clinic
    Some types of allergies can trigger a severe reaction known as anaphylaxis Certain foods, insect stings and medicines are among the allergens that can set off this life-threatening emergency Anaphylaxis can cause you to go into shock
  • Shellfish allergy - Symptoms and causes - Mayo Clinic
    Anaphylaxis Allergies can cause a severe, potentially life-threatening allergic reaction known as anaphylaxis It can occur within seconds to minutes after exposure to something you're allergic to — and worsens quickly An anaphylactic reaction to shellfish is a medical emergency
  • Egg allergy - Symptoms causes - Mayo Clinic
    Anaphylaxis A severe allergic reaction can lead to anaphylaxis, a life-threatening emergency that requires an immediate epinephrine (adrenaline) shot and a trip to the emergency room Anaphylaxis signs and symptoms include: Constriction of airways, including a swollen throat or a lump in your throat that makes it difficult to breathe
  • Food allergy - Symptoms and causes - Mayo Clinic
    In some people, a food allergy can cause severe symptoms or even a life-threatening reaction known as anaphylaxis Food allergy affects an estimated 8% of children under age 5 and up to 4% of adults While there's no cure, some children outgrow their food allergies as they get older





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