The early symptom of myasthenia gravis is:

Appeared in: AIIMS Delhi NO-2016

Explanation

Myasthenia Gravis (MG) is an autoimmune disease characterized by fatigable muscle weakness due to antibodies attacking acetylcholine receptors at the neuromuscular junction.
The earliest and most constant signs of MG involve the extraocular muscles, which are used frequently and are highly susceptible to fatigue.
This ocular involvement typically presents as ptosis (asymmetric drooping of one or both eyelids) and/or diplopia (double vision).
According to clinical data, a majority of patients present with these ocular symptoms at the onset of the disease.

Option B: Respiratory difficulty is a sign of severe, advanced disease or a myasthenic crisis, which is a medical emergency. It is not a typical early symptom.
Option C: This is the opposite of the characteristic pattern of MG. The hallmark of the disease is fatigability, where muscle weakness worsens with sustained activity and towards the end of the day.
Option D: Tremors are not a feature of Myasthenia Gravis. The primary symptom is weakness, not involuntary shaking.

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 play a vital role in educating patients about energy conservation techniques, such as planning demanding tasks for the morning when muscle strength is greatest.
Administering anticholinesterase medication (pyridostigmine) on a strict schedule, typically 30-60 minutes before meals, is critical to improve chewing and swallowing, thereby preventing aspiration.
Recognizing the signs of a myasthenic crisis (severe respiratory distress, dysphagia) versus a cholinergic crisis (cramps, diarrhea, excessive secretions from medication overdose) is a crucial nursing assessment skill.

How to Approach the Question

First, identify the key terms in the question: 'early symptom' and 'myasthenia gravis'. This directs you to recall the initial presentation of the disease, not its complications or late-stage features.
Recall the pathophysiology of Myasthenia Gravis: It's an autoimmune disorder causing fatigable weakness, with certain muscle groups being more vulnerable.
Evaluate each option based on this knowledge:
Ptosis (eyelid drooping) involves the ocular muscles, which are classically affected first in MG.
Respiratory difficulty is a severe complication (myasthenic crisis), not an early sign.
Weakness in MG worsens, not improves, with fatigue and towards the end of the day.

Concept Tested & Keywords

QGAy4fWEVzYQbZahegPeD3

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1665-1667

E6 Medicine Davidson Principles Practice 24e p. 1161-1163

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 613-615

Practise the full AIIMS Delhi NO-2016

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