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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

33.9K
Overview
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Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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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,...
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Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

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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...
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Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

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Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
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Cardiopulmonary Resuscitation IV: Pharmacological Management01:25

Cardiopulmonary Resuscitation IV: Pharmacological Management

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Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...
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Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
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Related Experiment Video

Updated: Apr 8, 2026

Measuring Local Anaphylaxis in Mice
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Measuring Local Anaphylaxis in Mice

Published on: October 14, 2014

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Epinephrine in anaphylaxis: doubt no more.

T Ted Song1, Phil Lieberman

  • 1aUniversity of Washington, Department of Medicine, Division of Allergy and Infectious Diseases, Seattle, Washington bDepartment of Medicine & Pediatrics, University of Tennessee College of Medicine, Memphis, Tennessee, USA.

Current Opinion in Allergy and Clinical Immunology
|June 26, 2015
PubMed
Summary

Prompt epinephrine (adrenaline) administration is critical for treating anaphylaxis, outperforming antihistamines and corticosteroids. Timely use of epinephrine auto-injectors can prevent fatalities from severe allergic reactions.

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Area of Science:

  • Allergy and Immunology
  • Pharmacology
  • Emergency Medicine

Background:

  • Anaphylaxis is a severe, life-threatening allergic reaction.
  • Current treatment guidelines are reviewed for optimal management.
  • The role of various medications in anaphylaxis treatment is debated.

Purpose of the Study:

  • To review literature supporting epinephrine as the primary treatment for anaphylaxis.
  • To compare epinephrine's efficacy against H-1 antihistamines and corticosteroids.
  • To emphasize the critical timing of epinephrine administration.

Main Methods:

  • Literature review of studies on anaphylaxis treatment.
  • Analysis of pharmacokinetic and pharmacodynamic data for epinephrine.
  • Evaluation of available epinephrine auto-injector devices.

Main Results:

  • Epinephrine demonstrates rapid onset of action, antagonizing anaphylaxis mediators effectively.
  • Maximal effect of intramuscular epinephrine is achieved within 10 minutes.
  • Prefilled auto-injectors offer weight-appropriate dosing (0.15-0.50 mg) and varied needle lengths for optimal delivery.

Conclusions:

  • Prompt epinephrine administration is essential and can prevent anaphylaxis-related fatalities.
  • Patient and caregiver education on recognizing anaphylaxis and using epinephrine auto-injectors is crucial.
  • Epinephrine remains the first-line therapy for anaphylaxis.