👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: MG · myasthenia · grave muscle weakness
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Use this quick-reference guide to spot, treat, and prevent Myasthenia Gravis on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Mechanism
Autoimmune attacks ACh receptors
Descending weakness, worse PM
🩺 Signs
Ptosis, diplopia = early
Dysphagia, weak chewing, slurred
Weakness improves with rest
🧪 Meds
Pyridostigmine before meals
Edrophonium (Tensilon) test = dx
Avoid aminoglycosides, mag
🚩 Report
Myasthenic crisis: resp failure
Cholinergic crisis = overdose
📚 Myasthenia Gravis — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Myasthenia gravis is an autoimmune disorder where antibodies attack acetylcholine receptors at the neuromuscular junction, causing weakness of voluntary muscles. The hallmark is muscle weakness that worsens with activity and improves with rest. It commonly affects the eyes, face, throat, and breathing muscles, and is treated with anticholinesterase drugs like pyridostigmine. Remember: weakness gets worse as the day goes on.
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Key points
Understand these first
Ptosis (drooping eyelids) and diplopia (double vision) are often the earliest signs.
Muscle weakness worsens with repeated use/exertion and improves with rest.
Respiratory muscle weakness can progress to respiratory failure (myasthenic crisis).
Myasthenic crisis is undermedication (worsening weakness); cholinergic crisis is overmedication (excess acetylcholine effects like salivation, GI cramping, and bradycardia).
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Nursing priorities
What to do, in order
Monitor respiratory status closely (rate, depth, vital capacity) as respiratory failure is the greatest danger.
Assess swallowing and implement aspiration precautions; time meals for periods of peak medication effect and energy.
Administer anticholinesterase medication (pyridostigmine) on time, exactly as scheduled, before meals.
Plan activities to conserve energy and schedule rest periods to reduce fatigue-related weakness.
Keep emergency airway and suction equipment available; have atropine ready as the antidote for cholinergic crisis.
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Red flags — report now
Escalate immediately
Increasing respiratory distress, declining vital capacity, or inability to clear secretions signals impending crisis, an emergency.
Difficulty swallowing or managing oral secretions indicates high aspiration risk.
Excess salivation, sweating, abdominal cramping, and bradycardia suggest cholinergic crisis (overmedication), notify the provider.
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Patient teaching
What patients must know
Take anticholinesterase medication exactly on schedule; even a slight delay can cause dangerous weakness.
Conserve energy by planning demanding activities for early in the day after medication and resting frequently.
Avoid infection, stress, extreme temperatures, and certain drugs (some antibiotics, sedatives) that can worsen weakness, and wear a medical alert bracelet.
❓ Myasthenia Gravis: NCLEX FAQs
What are the priority nursing interventions for Myasthenia Gravis?
Monitor respiratory status closely (rate, depth, vital capacity) as respiratory failure is the greatest danger. Assess swallowing and implement aspiration precautions; time meals for periods of peak medication effect and energy. Administer anticholinesterase medication (pyridostigmine) on time, exactly as scheduled, before meals. Plan activities to conserve energy and schedule rest periods to reduce fatigue-related weakness.
What are the warning signs of Myasthenia Gravis a nurse must report?
Increasing respiratory distress, declining vital capacity, or inability to clear secretions signals impending crisis, an emergency. Difficulty swallowing or managing oral secretions indicates high aspiration risk. Excess salivation, sweating, abdominal cramping, and bradycardia suggest cholinergic crisis (overmedication), notify the provider.
What do I need to know about Myasthenia Gravis for the NCLEX?
Ptosis (drooping eyelids) and diplopia (double vision) are often the earliest signs. Muscle weakness worsens with repeated use/exertion and improves with rest. Bulbar involvement causes difficulty chewing, swallowing, and speaking, raising aspiration risk. Respiratory muscle weakness can progress to respiratory failure (myasthenic crisis).
What patient teaching is important for Myasthenia Gravis?
Take anticholinesterase medication exactly on schedule; even a slight delay can cause dangerous weakness. Conserve energy by planning demanding activities for early in the day after medication and resting frequently. Avoid infection, stress, extreme temperatures, and certain drugs (some antibiotics, sedatives) that can worsen weakness, and wear a medical alert bracelet.
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Quick Tip
Ptosis (drooping eyelids) and diplopia (double vision) are often the earliest signs.