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👑 An atopic patient develops severe eosinophilic tissue damage despite treatment with antihistamines. Which eosinophil product is most directly responsible for tissue injury? 🔹A) Histaminase 🔹B) Arylsulfatase 🔹C) Major Basic Protein 🔹D) Heparin

🚨 TYPE I HYPERSENSITIVITY — EXAM TRAPS ⚡Type I = IgE-mediated + Immediate (15–30 min) ☹️ Sensitization: Allergen → TH2 → IL-4/IL-13 → IgE → FcεRI on mast cells 🔥 MOST IMPORTANT STEP: Allergen cross-links TWO adjacent IgE molecules on mast cells → Degranulation → Histamine release ❌ No cross-linking = No allergy reaction 😵 Favorite MCQ: IgE DOES NOT activate complement → Complement is NOT involved in Type I HS Mediators: ⏰ Immediate (15–30 min): • Histamine • ECF-A • NCF-A • Heparin • Serotonin ⏰ Late (4–12 hr): • Leukotrienes (LTC4, LTD4, LTE4) • Prostaglandins • PAF ⭐️ Histamine causes: • Bronchoconstriction • ↑ Vascular permeability • ↑ Mucus secretion 🧬 Cytokines: • IL-4 + IL-13 → IgE production • IL-5 → Eosinophils 🌝 Most severe manifestation: ANAPHYLACTIC SHOCK 💊 First-line treatment: EPINEPHRINE (ADRENALINE) 🏆 One-line memory: TH2 → IL-4/13 → IgE → Mast Cell → Cross-linking → Histamine → Allergy

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هاي من شهود رحم الله والديها 🤍

اخذ هواية وكت بس المهم تگولولي رحم الله والديچ

لتشوفوهن هواية اقروه كل جدول وحد وحتفهمون + target cells غير مطلوبة عدنا بس من خلالهن تفهمون التأثير

الـeczema (dermatitis) تصير بنوعين من الحساسية الاول والرابع بنفس الاعراض بس الفرق: Type I ⇒ atopic dermatitis Type IV ⇒ contact dermatitis Doctor house clinical example

Allergic reaction is divided:

1-Atopy

genetic predisposition for developing allergic reaction because of IgE overload (genetically) Causes food insect stings chemicals pencillin

2-anaphylactoid reaction

produce same clinical features as atopy but without IgE. It could be caused by degranulation of mast cell by complement system Causes drugs physical cold Ideopathic

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جامعة ٤ ملازم 🔥

اني غلطت بيهم فكلت اجمعهم ذوله بالجدول

⭐️ IFN-alpha>treatment of viral hepatitis ⭐️ IFN-beta>treatment of multiple sclerosis ⭐️ IFN-gamma>treatment of chronic granulomatous disease (CGD)

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