A nurse in the emergency department is assisting with the care of a client who has myasthenia gravis and is in crisis.
The nurse should identify that which of the following factors can cause a myasthenic crisis?.

Developing a respiratory infection.

Taking too much prescribed medication.

Insufficient sleep.

Insufficient exercise.

Answer and Explanation

The Correct Answer is A

Choice A rationale:

Developing a respiratory infection can indeed trigger a myasthenic crisis. Any form of stress on the body, including infections, can exacerbate symptoms.

Choice B rationale:

Taking too much prescribed medication is not typically a cause of myasthenic crisis. However, medication changes should always be managed carefully.

Choice C rationale:

Insufficient sleep can contribute to overall stress and fatigue, potentially exacerbating symptoms, but it is not a primary cause of myasthenic crisis.

Choice D rationale:

Insufficient exercise is not a known trigger for myasthenic crisis. While regular exercise can help manage symptoms, lack of exercise is not a direct cause.

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Correct Answer is B

Explanation

The correct answer is Choice B

Choice A rationale: Dantrolene is a direct-acting skeletal muscle relaxant that works by inhibiting calcium release from the sarcoplasmic reticulum in muscle cells, thereby reducing muscle contraction. It is not intended for as-needed use during acute spasms but requires consistent dosing to maintain therapeutic levels. Intermittent use undermines its pharmacokinetics and may lead to subtherapeutic effects. The half-life of dantrolene is approximately 8.7 hours, and steady-state levels are necessary for optimal spasticity control in multiple sclerosis.

Choice B rationale: Dantrolene’s therapeutic effect on muscle spasticity may take several weeks to manifest due to its mechanism of action involving gradual reduction in intracellular calcium availability. If no improvement is noted within 3 months, it may indicate inadequate response or the need for dosage adjustment. Monitoring for efficacy is essential, as prolonged use without benefit increases risk of hepatotoxicity. Liver function tests should be monitored regularly. Normal ALT levels are 7–56 units/L; elevations may signal toxicity.

Choice C rationale: Dantrolene is classified as pregnancy category C, indicating that risk to the fetus cannot be ruled out. Animal studies have shown adverse effects, and there are no adequate human studies confirming safety during pregnancy. Therefore, it is not considered safe without careful risk-benefit analysis. Teratogenicity and fetal toxicity are concerns due to its action on muscle fibers and potential systemic effects. Pregnant clients should consult their provider before initiating or continuing dantrolene therapy.

Choice D rationale: Dantrolene does not directly affect calcium levels in the bloodstream. Its mechanism involves inhibition of calcium release within muscle cells, not systemic calcium metabolism. Routine calcium monitoring is not required unless the client has a separate condition affecting calcium homeostasis. Normal serum calcium levels range from 8.5 to 10.5 mg/dL. The primary lab concern with dantrolene is hepatotoxicity, necessitating regular liver function tests, not calcium surveillance. This statement reflects a misunderstanding of the drug’s effects.

Correct Answer is ["7.5"]

Explanation

To calculate the volume of fluoxetine to administer, we need to use the formula for dose conversion.

Step 1 is to set up the equation: 30 mg (desired dose) ÷ (20 mg/5 mL). This simplifies to 30 mg × (5 mL/20 mg). The mg units cancel out, leaving us with the volume in mL.

So, the correct answer is 7.5 mL.

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A nurse in the emergency department is assisting with the care of a client who has myasthenia gravis and is in crisis. The nurse should identify that which of the following factors can cause a myasthenic crisis?.

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is reinforcing teaching for a female client who has multiple sclerosis and a new prescription for dantrolene. Which of the following client statements indicates an understanding of the teaching?.

Correct Answer is B

Explanation

A nurse is preparing to administer fluoxetine 30 mg PO for a client who has depression and cannot swallow capsules. Available is fluoxetine 20 mg/5 mL oral solution. How many mL should the nurse plan to administer? (Round to the nearest tenth. Use a leading zero if it applies.)

Correct Answer is ["7.5"]

Explanation

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A nurse is preparing to administer phenytoin 75 mg PO. Available is phenytoin suspension 25 mg/5 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

A nurse is reinforcing discharge instructions with a client who has multiple sclerosis (MS). Which of the following instructions should the nurse include?.

A nurse in the emergency department is assisting with the care of a client who has myasthenia gravis and is in crisis.
The nurse should identify that which of the following factors can cause a myasthenic crisis?.