QuestionSBA
QuestionChoice
Type 3 hypersensitivity reactions are immune complex-mediated. Examples of Type 3 Hypersensitivity reactions include serum sickness, post-streptococcal glomerulonephritis, and extrinsic allergic alveolitis. By contrast, symptoms of anaphylaxis as demonstrated by this patient are characteristic of a type 1 hypersensitivity reaction.
10007512
b
Type 3
QuestionChoice
Type 4 hypersensitivity reactions are also known as delayed hypersensitivity. They are T cell-mediated rations. Examples of type 4 include TB, graft versus host disease, allergic contact dermatitis, scabies, Multiple sclerosis, and Guillain-Barré syndrome. By contrast, symptoms of anaphylaxis as demonstrated by this patient are characteristic of a type 1 hypersensitivity reaction.
10007515
e
Type 4
QuestionChoice
This question describes a patient with clinical features of anaphylaxis: swollen lips and tongue, wheezing, shortness of breath, tachycardia, hypotension, urticaria, pruritus, and flushed skin. Anaphylaxis is an example of a Type 1 hypersensitivity reaction. These reactions occur when the antigen reacts with IgE bound to mast cells. Another example of a type 1 hypersensitivity reaction is atopy (asthma, eczema, and hay fever).
10007511
a
Type 1
QuestionChoice
Examples of type 5 hypersensitivity reactions include Grave’s disease and myasthenia gravis. These types of reactions occur when antibodies recognize and bind to cell surface receptors, which causes either stimulation or blockage of ligand binding. By contrast, symptoms of anaphylaxis as demonstrated by this patient are characteristic of a type 1 hypersensitivity reaction.
10007514
d
Type 5
QuestionChoice
Type 2 hypersensitivity reactions are cell-bound. They occur when IgG or IgM binds to a cell surface antigen. Examples of type 2 hypersensitivity reactions include autoimmune haemolytic anaemia, Goodpasture’s syndrome, and rheumatic fever. By contrast, symptoms of anaphylaxis as demonstrated by this patient are characteristic of a type 1 hypersensitivity reaction.
10007513
c
Type 2
Concept
Chapter
2693
4091
Hypersensitivity reactions
Topic
158
Immunology
14049
A 16-year-old male attends the emergency department with lip and tongue swelling that began 20 minutes ago. He is in noticeable distress and is finding it increasingly more difficult to breathe. On examination, his heart rate is 120, and his blood pressure 89/60.

Which type of hypersensitivity reaction is he experiencing?
a