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Related to anaphylactoid reaction: anaphylaxis, Anaphylactic reaction


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 ?
Tween-80 and impurity induce anaphylactoid reaction in zebrafish.
The likelihood of an anaphylactoid reaction to contrast media is not necessarily related to contrast media dose, nor is it always an immediate response to contrast media exposure.
(v) Do not spill cyst contents during surgery to avoid anaphylactoid reaction, recurrence, and multiple hydatidosis.
The rapid intravenous infusion of vancomycin is associated with RMS, an anaphylactoid reaction. Several case reports are there.
Delayed anaphylactoid reaction in a worker exposed to chromium.
Immune immunoglobulin IgE-mediated anaphylactic or non-immune non-IgE anaphylactoid reaction to amniotic fluid involve mast cell and basophil stimulation causing activation of complement, thrombin and coagulation cascade which are potentially fatal and require emergency management.
Lichtenstein, "In vitro basophil histamine release induced by mannitol in a patient with a mannitol-induced anaphylactoid reaction," The Journal of Allergy and Clinical Immunology, vol.
Four subjects in the FCM group experienced Grade 1 hypersensitivity reactions, and no subject experienced anaphylaxis or an anaphylactoid reaction. Based on previous studies conducted on low-molecular-weight iron dextran the rate of anaphylaxis or anaphylactoid reactions was reported to be 1.7% [10, 11].
In literature a 3-year-old child is reported to develop skin rashes and anaphylactoid reaction with intramuscular ketamine administration.24 We are of the opinion that in our study, eritematous skin reactions, which regressed spontaneously in 26 patients (3.2%) in Group 1 were caused by fast injections and following acute increase in plasma histamine levels.
In one of these case reports, the patient had the complete spectrum of anaphylaxis but did not have a history of allergies or previous exposure of indigo carmine, and the authors suggested that indigo carmine directly may have triggered histamine release, consistent with an anaphylactoid reaction associated with severe hypotension, bronchospasm, and urticaria [6].
Kounis syndrome was described in 1991 as the concurrence of acute coronary events with an allergic or a hypersensitivity response and an anaphylactic or anaphylactoid reaction.!21 Several possible causes of Kounis syndrome have been reported.