The nurse is caring for a client with myasthenia gravis. The client is vomiting and complaining of abdominal cramps and diarrhea. The nurse also notes that the client is hypotensive and experiencing facial muscle twitching. The nurse interprets that these symptoms are compatible with?

1. A

   Myasthenic crisis

2. B

   Cholinergic crisis

3. C

   Systemic infection

4. D

   A reaction to plasmapheresis

Appeared in: DHS 2018 shift 1st

Explanation

• The client's symptoms—vomiting, abdominal cramps, diarrhea, hypotension, and facial muscle twitching—are classic signs of a cholinergic crisis.
• This crisis results from overmedication with anticholinesterase drugs, leading to an excess of acetylcholine at the neuromuscular junctions.
• The gastrointestinal symptoms (vomiting, cramps, diarrhea) are muscarinic effects, while facial muscle twitching (fasciculations) is a nicotinic effect of excessive acetylcholine.
• The combination of these 'wet' symptoms (from parasympathetic overstimulation) and muscle twitching is the hallmark of cholinergic toxicity.

Why Other Options Were Wrong

• Option A: This is caused by undermedication and presents with profound muscle weakness, respiratory failure, tachycardia, and hypertension, not the GI symptoms and hypotension seen here.
• Option C: A systemic infection would typically present with fever, chills, and an elevated white blood cell count, which are not mentioned in the scenario.
• Option D: Reactions to plasmapheresis typically involve hypovolemia, hypocalcemia (paresthesias, tetany), or allergic reactions, which do not match this specific symptom cluster.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to Differentiation between myasthenic crisis and cholinergic crisis in a client with myasthenia gravis to guide bedside assessment, documentation, and the next nursing action.
• Distinguishing between a cholinergic and myasthenic crisis is a critical nursing skill, as the treatments are opposite. Giving more anticholinesterase medication in a cholinergic crisis can be fatal.
• The priority nursing assessment for any client with a myasthenia gravis crisis is respiratory status, as both conditions can lead to respiratory muscle weakness and failure.
• The Tensilon (edrophonium) test, while less common now due to risks, was historically used to differentiate crises. In a cholinergic crisis, symptoms worsen. Atropine must always be available as an antidote during this test and for treating the crisis.

How to Approach the Question

• First, identify the client's underlying diagnosis: Myasthenia Gravis. This immediately focuses your thinking on complications of the disease or its treatment.
• Next, analyze the cluster of symptoms presented: vomiting, cramps, diarrhea (gastrointestinal/muscarinic), hypotension, and muscle twitching (nicotinic).
• Recall the two major, opposing crises in MG: myasthenic (too little medication) and cholinergic (too much medication).
• Compare the client's symptoms to the classic presentations. The 'wet' symptoms (diarrhea, vomiting) and twitching point strongly to a cholinergic crisis due to excess acetylcholine.
• Systematically eliminate the other options. The symptoms do not align with a typical infection or a direct reaction to plasmapheresis.

Concept Tested & Keywords

• Concept Tested: Differentiation between myasthenic crisis and cholinergic crisis in a client with myasthenia gravis.
• Stem keywords: myasthenia gravis, vomiting, abdominal cramps, diarrhea, hypotension, facial muscle twitching
• Lead-in keywords: interprets, compatible with
• Clinical cues: Client with known myasthenia gravis presenting with GI distress and muscle twitching suggests a complication related to their medication.

Question ID

QgOGLFPd0FFregCbMP7T6X

Copy ID

Reference Book

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

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 p. 135-137

E6 Medicine Harrison 22e Part 2 p. 1536-1538