Anaphylactic Reactions

Today, we're diving into Chapter 23 of Emergency Care, focusing on anaphylactic reactions. This is crucial for EMS professionals.We're exploring the body's response at a cellular level, demonstrating the intricate biological processes involved in allergic reactions.We'll set the stage by overviewing allergic and anaphylactic reactions, their pathophysiology, assessment, care, and the role of epinephrine.Anaphylaxis is a severe allergic reaction affecting multiple body systems, like hives and difficulty breathing. It's a critical medical emergency.Allergic reactions are hypersensitivity responses, with anaphylaxis being a severe, life-threatening form. Timely treatment is vital.Our immune system responds to foreign substances, called antigens. Allergens are antigens provoking reactions, with antibodies produced to fight them.The body produces immunoglobulin E (IgE) to allergens. When IgE meets an allergen, it triggers an immune response, sometimes severe.Anaphylaxis can lead to airway swelling and poor perfusion. It requires prior exposure to an antigen. Common causes include bee venom and nuts.We differentiate between anaphylactic and anaphylactoid reactions: one is immune-mediated involving IgE, the other is non-immune mediated.An excessive response to an allergen is an allergic reaction. Anaphylaxis is severe, systemic, causing airway swelling, bronchoconstriction, and vasodilation.