Which type of hypersensitivity reaction causes good pasture syndrome?

RIMS Nursing Officer - 2022

Pathology & Genetics

Easy

Appeared in: RIMS Nursing Officer - 2022

Explanation

Goodpasture syndrome is a classic example of a Type II (cytotoxic) hypersensitivity reaction.
The core mechanism involves autoantibodies (IgG) binding directly to fixed antigens on the basement membranes of the kidneys (glomeruli) and lungs (alveoli).
This binding activates the complement cascade and recruits inflammatory cells, leading to direct tissue damage, which manifests as glomerulonephritis and pulmonary hemorrhage.

Option A: Type I reactions are immediate, IgE-mediated, and involve mast cell degranulation. This mechanism is responsible for allergic conditions.
Option C: Type III reactions are caused by the deposition of circulating antigen-antibody (immune) complexes in tissues, leading to a 'lumpy-bumpy' pattern on immunofluorescence. Goodpasture syndrome involves antibodies binding directly to tissue, creating a linear pattern.
Option D: Type IV reactions are cell-mediated (T-cell dependent) and delayed, taking 24-48 hours to develop. They do not involve antibodies as the primary mechanism of injury.

Clinical Relevance

Nursing practice connection: Knowing Hypersensitivity Reactions and Autoimmune Disorders helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Recognizing the combination of acute kidney injury (e.g., hematuria, rising creatinine) and pulmonary symptoms (e.g., hemoptysis, shortness of breath) is critical for nurses, as Goodpasture syndrome is a medical emergency requiring urgent intervention.
Nursing care focuses on managing aggressive treatments like plasmapheresis (to physically remove the harmful autoantibodies from the blood) and immunosuppressive therapy (e.g., corticosteroids, cyclophosphamide), while closely monitoring for complications like infection and fluid overload.
What if? If a patient's kidney biopsy showed a 'granular' or 'lumpy-bumpy' immunofluorescence pattern instead of a linear one, the diagnosis would shift from a Type II to a Type III hypersensitivity-mediated glomerulonephritis (like lupus nephritis), altering the specific diagnostic workup and long-term management plan.

How to Approach the Question

First, identify the key terms in the question: 'Goodpasture syndrome' and 'hypersensitivity reaction'.
This is a factual recall question that tests your knowledge of immunology and classic disease examples.
Mentally review the four types of hypersensitivity reactions and their core mechanisms.
Associate specific, well-known diseases with each type. Goodpasture syndrome is a textbook example of a Type II reaction.
Confirm your choice by recalling that Type II involves antibodies attacking fixed tissues, which is exactly what happens to the kidney and lung basement membranes in this disease.
Eliminate the other options by matching them to their own classic examples: Type I (allergies), Type III (lupus), and Type IV (tuberculin test).

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