A nurse is caring for a client who has myasthenia gravis. The nurse should recognize that this disease is caused by which of the following types of hypersensitivities?
Delayed
Immediate
Immune complex-mediated
Cytotoxic
The Correct Answer is D
Cytotoxic hypersensitivity is a type of hypersensitivity that involves the production of IgG or IgM antibodies that bind to antigens on the surface of cells, leading to cell destruction by complement activation or antibody-dependent cellular cytotoxicity. Myasthenia gravis is an example of a cytotoxic hypersensitivity, as it is caused by autoantibodies that target the acetylcholine receptors on the muscle cells, impairing neuromuscular transmission and causing muscle weakness.
Delayed hypersensitivity is a type of hypersensitivity that involves the activation of T cells and macrophages, leading to inflammation and tissue damage after several hours or days of exposure to an antigen. Examples of delayed hypersensitivity include contact dermatitis, tuberculin skin test, and transplant rejection.
Immediate hypersensitivity is a type of hypersensitivity that involves the production of IgE antibodies that bind to mast cells or basophils, leading to degranulation and release of histamine and other mediators, causing anaphylaxis, urticaria, or allergic rhinitis within minutes of exposure to an antigen.
Immune complex-mediated hypersensitivity is a type of hypersensitivity that involves the formation of antigen- antibody complexes that deposit in tissues or blood vessels, leading to complement activation and inflammation, causing vasculitis, glomerulonephritis, or serum sickness within hours or days of exposure to an antigen.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
No explanation
Correct Answer is D
Explanation
Hemorrhagic stroke is a type of stroke that occurs when a blood vessel ruptures in the brain, causing bleeding and increased intracranial pressure. The client's symptoms of sudden, severe headache, vomiting, seizure, and
unresponsiveness are consistent with hemorrhagic stroke. The client's elevated blood pressure and temperature are also risk factors for hemorrhagic stroke.
Thrombotic stroke is a type of stroke that occurs when a blood clot forms in an artery that supplies blood to the brain, causing ischemia and tissue damage. The client's symptoms are not typical of thrombotic stroke, which usually has a gradual onset and affects one side of the body.
Transient ischemic atack (TIA) is a temporary interruption of blood flow to the brain, causing neurologic deficits that resolve within 24 hours. The client's symptoms are not indicative of TIA, which does not cause loss of consciousness or permanent brain damage.
Embolic stroke is a type of stroke that occurs when a blood clot or other debris travels from another part of the body to the brain, causing occlusion and ischemia. The client's symptoms are not characteristic of embolic stroke, which usually has a sudden onset and affects one side of the body.
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