The Calgary Guide to Understanding Disease @TheCalgaryGuide
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Type I Hypersensitivity: Pathogenesis and clinical findings
Definition: Production of lgE Antibodies that bind to harmless allergens
leading to an allergic ... Sensitization" to Allergen ... Initial exposure to allergen ... after clearance of allergen ... Complications: • Acute
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
Immunological Target: Allergen ... fever, Urticaria, Allergic ... Immunological Target: Allergen ... Hypersensitivity #Allergy ... #Allergic #Reactions
Type IV Hypersensitivity: Pathogenesis and clinical findings
Definition: Unique because it is entirely T-Cell mediated; exposure to
mediated; exposure to allergen ... development of allergen-specific ... Allergic reaction ... Initial exposure to allergen ... HypersensitivityReaction #Allergy
Anaphylaxis: Signs and Symptoms
Anaphylaxis: when any egg of three conditions is met:
1. Acute onset of skin/mucosal
Acute onset of skin ... exposure to a likely allergen ... exposure to known allergen ... symptoms in the acute
Allergic Rhinitis: Pathogenesis and clinical findings

1. Allergy Sensitization -> Antigen Exposure -> APC (macrophages, HLA class
Allergic Rhinitis ... Allergy Sensitization ... Tissue edema #Allergic
Acute Spinal Cord Injuries: Pathogenesis and clinical findings
 • Anterior Cord Syndrome -> Anterior spinal artery
Acute Spinal Cord ... weakness and #Acute ... symptoms #msk #orthopedics
Anterior Shoulder Dislocation: Pathogenesis, clinical, and radiographic findings

Trauma, Fall on, outstretched arm, Overhead throwing => Abduction
to glenoid -> Acute ... symptoms #msk #orthopedics
Acute Compartment Syndrome
 • Crush injuries, burns, circumferential constriction to limbs (each containing facially divided muscle
Acute Compartment ... compartment pressure #Acute ... pathophysiology #orthopedics
Type III Hypersensitivity: Pathogenesis and clinical findings
Definition: Small antigen-antibody complexes (produced from normal immune response to
HypersensitivityReaction #Allergy
Achilles Tendon Rupture - Pathogenesis and clinical findings
 • The Achilles tendon is 15cm long in
warriors") • Acute ... pathophysiology #msk #orthopedics