Mechanisms of Type II hypersensitivity includes all EXCEPT

Appeared in: BHU NO-2019

Explanation

Immune Complex disease is the defining mechanism of Type III hypersensitivity, not Type II.
In this process, circulating, soluble antigens bind with antibodies to form immune complexes.
These complexes then deposit in tissues such as blood vessels, kidneys, and joints, leading to complement activation and inflammation.
Classic examples of Type III hypersensitivity include Systemic Lupus Erythematosus (SLE), serum sickness, and post-streptococcal glomerulonephritis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Mechanisms of Hypersensitivity Reactions (Type II vs. Type III) as background academic context rather than a clinical decision trigger.
Understanding the different hypersensitivity mechanisms is crucial for nurses to recognize and manage autoimmune diseases and adverse drug reactions.
For example, recognizing the signs of a transfusion reaction (a Type II reaction) like fever, chills, and back pain requires immediate cessation of the transfusion and notification of the physician.
Recognizing the signs of serum sickness (a Type III reaction) like fever, rash, and joint pain after receiving certain medications or antisera is vital for timely intervention.

How to Approach the Question

First, identify the core concept of the question, which is 'Type II hypersensitivity'.
Note the keyword 'EXCEPT'. This means you are looking for the option that does NOT belong to the group of Type II mechanisms.
Review each option and recall the mechanisms of Type II hypersensitivity.
Option A (cellular dysfunction), B (opsonization), and D (complement-mediated inflammation) are all classic Type II mechanisms.
Identify that Option C (Immune Complex disease) is the defining feature of Type III hypersensitivity.
Therefore, 'Immune Complex disease' is the correct answer as it is the exception.

Concept Tested & Keywords

Concept Tested: Mechanisms of Hypersensitivity Reactions (Type II vs. Type III)
Stem keywords: Type II hypersensitivity, mechanisms
Lead-in keywords: EXCEPT
Negative lead-in flag: Question asks for the exception (what is NOT a mechanism).

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed pp. 216-218, 217-219

E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 1 (1-214) p. 160-162

Practise the full BHU NO-2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.