Which of the following early symptom is commonly seen in myasthenia gravis

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2024

Explanation

Myasthenia Gravis (MG) is an autoimmune disorder where antibodies attack acetylcholine receptors, leading to impaired neuromuscular transmission.
The hallmark of MG is muscle weakness that worsens with activity (fatigability) and improves with rest.
The initial and most common presentation involves the extraocular muscles, which are used constantly. This leads to ptosis (drooping of the eyelids) and diplopia (double vision) as the earliest signs.

Option A: Dysphagia (difficulty swallowing) is a symptom of bulbar muscle involvement, which typically occurs after the initial ocular symptoms and signifies progression of the disease.
Option B: This statement is the opposite of the hallmark sign of Myasthenia Gravis. In MG, fatigue and weakness are exacerbated by activity and improve with rest.
Option C: Respiratory distress is a sign of a myasthenic crisis, a life-threatening complication of MG that occurs in later, more severe stages. It is not an early symptom.

Clinical Relevance

Nursing practice connection: Knowing Early clinical manifestations of Myasthenia Gravis helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses performing a neurological assessment should be highly attentive to complaints of double vision or observations of ptosis, as these can be the first clues to Myasthenia Gravis.
Patient education is critical. A patient diagnosed with MG must be taught to recognize the signs of a myasthenic crisis, such as difficulty swallowing or breathing, and to seek emergency care immediately.
What if? - If a patient with known MG presents with a fever, cough, and increasing shortness of breath, the nurse should suspect a myasthenic crisis precipitated by a respiratory infection. This is a medical emergency requiring immediate intervention to support breathing, not just management of chronic symptoms.

How to Approach the Question

First, identify the key elements of the question: 'early symptom' and 'myasthenia gravis'.
Recall the pathophysiology of Myasthenia Gravis: it's an autoimmune disease causing muscle weakness that worsens with use (fatigability).
Consider which muscle groups are most active and likely to show fatigue first. The extraocular muscles controlling the eyelids and eye movements are in near-constant use.
Evaluate the options based on this understanding. Ptosis is an ocular symptom. Dysphagia (swallowing) and respiratory distress (breathing) involve larger muscle groups and typically signify more advanced disease.
Eliminate the option 'Fatigue improving by activity' as it directly contradicts the known pathophysiology of MG.
Conclude that ptosis, an ocular sign, is the most common early symptom among the choices.

Concept Tested & Keywords

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