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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and anaphylaxis:...
Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...

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Related Experiment Video

Updated: Jul 16, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Anaphylactic shock: the great mimic.

Patrick F K Yong1, Jonathan Birns, Mohammad A A Ibrahim

  • 1Department of Clinical Immunology, Kings College Hospital, London, United Kingdom. pyong@doctors.org.uk

Southern Medical Journal
|April 3, 2007
PubMed
Summary

Diagnosing anaphylaxis, acute coronary syndrome, and pulmonary embolism in emergency settings is challenging. Prompt clinical assessment is crucial to avoid treatment delays and improve patient outcomes.

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Related Experiment Videos

Last Updated: Jul 16, 2026

Measuring Local Anaphylaxis in Mice
07:49

Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

Mouse Body Temperature Measurement Using Infrared Thermometer During Passive Systemic Anaphylaxis and Food Allergy Evaluation
04:34

Mouse Body Temperature Measurement Using Infrared Thermometer During Passive Systemic Anaphylaxis and Food Allergy Evaluation

Published on: September 14, 2018

Humanized Mediator Release Assay as a Read-Out for Allergen Potency
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Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

Area of Science:

  • Emergency Medicine
  • Clinical Diagnosis
  • Cardiopulmonary Medicine

Background:

  • Anaphylaxis, acute coronary syndrome (ACS), and pulmonary embolism (PE) are critical conditions frequently encountered in acute medical care.
  • These conditions present diagnostic challenges due to overlapping symptoms and the need for rapid intervention.

Observation:

  • The presented cases underscore the difficulty in differentiating these acute medical emergencies.
  • Timely and accurate diagnosis is often hindered by complex presentations.

Findings:

  • Delayed diagnosis in these critical conditions leads to suboptimal or incorrect treatment.
  • Inaccurate diagnosis directly correlates with increased patient morbidity and mortality.

Implications:

  • Emphasizes the indispensable role of thorough clinical assessment in the evaluation of patients with potential anaphylaxis, ACS, or PE.
  • Highlights the need for improved diagnostic strategies and clinical vigilance in acute care settings.
  • Underscores the potential to reduce adverse outcomes through enhanced diagnostic accuracy.