Which of the following is not an autoimmune disease?

RUHS, Jaipur, PB B.Sc Nursing Entrance-2022

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2022

Explanation

Bell palsy is an acute, idiopathic mononeuropathy affecting the 7th cranial (facial) nerve, leading to unilateral facial weakness or paralysis.
The condition is not primarily an autoimmune disorder; its most common cause is believed to be the reactivation of a latent viral infection, particularly Herpes Simplex Virus (HSV).
The viral reactivation causes inflammation and swelling of the facial nerve, leading to its compression within the narrow facial canal in the temporal bone.
Unlike autoimmune diseases, Bell palsy does not involve the immune system systematically attacking its own tissues as the primary pathological mechanism.

Option A: Systemic lupus erythematosus (SLE) is a classic example of a systemic autoimmune disease.
Option B: Rheumatoid arthritis (RA) is a well-known chronic, systemic autoimmune disorder.
Option C: Myasthenia gravis is a classic organ-specific autoimmune disease.

Clinical Relevance

Nursing practice connection: Knowing Differential diagnosis between autoimmune and neurological disorders helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Differentiating the cause of symptoms is critical for treatment. Bell palsy is managed with corticosteroids (and sometimes antivirals) to reduce inflammation, whereas autoimmune diseases require long-term immunosuppressive therapy.
A key nursing priority for patients with Bell palsy is protecting the affected eye. Due to incomplete eyelid closure (lagophthalmos), the cornea is at risk for drying, ulceration, and infection. Patient education on using artificial tears, lubricating ointments, and wearing an eye patch is essential.
What if? If a patient presents with facial palsy but also has a history of a tick bite and a characteristic 'bull's-eye' rash, the primary diagnosis would shift to Lyme disease. This also causes facial palsy but requires antibiotic treatment, not the standard regimen for idiopathic Bell palsy.

How to Approach the Question

First, identify that this is a 'negative' question because it uses the word 'NOT'. Your goal is to find the option that is the exception.
Define the key concept in the question: 'autoimmune disease'. This is a condition where the body's immune system mistakenly attacks its own healthy cells and tissues.
Systematically evaluate each option against this definition.
Option A, Systemic lupus erythematosus: Is this an autoimmune disease? Yes, it's a classic example.
Option B, Rheumatoid arthritis: Is this an autoimmune disease? Yes, it's a common autoimmune joint disease.
Option C, Myasthenia gravis: Is this an autoimmune disease? Yes, it affects the neuromuscular junction.

Concept Tested & Keywords

Concept Tested: Differential diagnosis between autoimmune and neurological disorders.
Stem keywords: autoimmune disease
Lead-in keywords: not
Negative lead-in flag: Question asks to identify the condition that is NOT an autoimmune disease.

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