Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.
Related to anaphylactoid: anaphylactoid purpura


A sudden, usually systemic allergic reaction, characterized by vasodilation resulting in decreased blood pressure, smooth muscle contraction resulting in shortness of breath, and hives, caused by hypersensitivity induced by a secondary exposure to a foreign substance, such as a drug or protein, after an initial sensitizing exposure.

an′a·phy·lac′tic (-lăk′tĭk), an′a·phy·lac′toid (-toid) adj.
an′a·phy·lac′ti·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


adj anafilactoide
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
References in periodicals archive ?
Coronary syndromes related to mast cell-associated disorders and inflammatory cell interactions, such as those involving T-lymphocytes and macrophages, further inducing allergic, hypersensitivity, anaphylactic, or anaphylactoid insults, are currently referred to as Kounis syndrome (Figure 1).
Tween-80 and impurity induce anaphylactoid reaction in zebrafish.
In our total study population, following 2295 ERCPs performed, no anaphylactoid or severe adverse reaction occurred.
Heupler Jr., "Systemic anaphylactoid reactions to iodinated contrast media during cardiac catheterization procedures: guidelines for prevention, diagnosis, and treatment.
Buchan, "Anaphylactoid reactions and angioedema during alteplase treatment of acute ischemic stroke," Canadian Medical Association Journal, vol.
For patients with a well-defined history of nonanaphylactoid reactions to penicillins (e.g., simple skin rash), a first-generation cephalosporin such as cefazolin may be a reasonable choice, and vancomycin is often recommended as an alternative to [beta]-lactam therapy for patients with anaphylactoid reactions.
(v) Do not spill cyst contents during surgery to avoid anaphylactoid reaction, recurrence, and multiple hydatidosis.
Associated autoimmune diseases (AADs), including vitiligo (47.6%, 101/212), autoimmune thyroid diseases (4.7%, 10/211), alopecia areata (2.4%, 5/211), and anaphylactoid purpura (0.5%, 1/211), were present in 48.3% (102/211) of patients, with 6.2% (13/211) having more than one associated disease.
HSP, also known as anaphylactoid purpura and immunoglobulin A (IgA) vasculitis, is a small-vessel leukocytoclastic vasculitis characterized by the perivascular deposition of IgAl-based immune complexes in the walls of arterioles and postcapillary venules.
The rapid intravenous infusion of vancomycin is associated with RMS, an anaphylactoid reaction.
Delayed anaphylactoid reaction in a worker exposed to chromium.
Scenesse is approved in Europe as an orphan medicinal product for the prevention of phototoxicity (anaphylactoid reactions and burns) in adult patients with EPP.