Jane, a 20-year old college student is admitted to the hospital with a tentative diagnosis of myasthenia gravis. She is scheduled to have a series of diagnostic studies for myasthenia gravis, including a Tensilon test. In preparing her for this procedure, the nurse explains that her response to the medication will confirm the diagnosis if Tensilon produces:
The client shows a marked improvement of muscle strength.
The client has muscles become weakened due to the impaired ability to respond to nerve signals
There is reduced amplitude of electrical stimulation in the muscle.
The anti-acetylcholine receptor antibodies are present.
The Correct Answer is A
Choice A rationale: The Tensilon test involves injecting edrophonium, and in myasthenia gravis, temporary improvement in muscle strength confirms the diagnosis by demonstrating increased acetylcholine activity at the neuromuscular junction.
Choice B rationale: This describes the pathophysiology of myasthenia gravis but doesn’t directly confirm the diagnosis via the Tensilon test.
Choice C rationale: While this may be seen in myasthenia gravis, the Tensilon test specifically aims to observe improved muscle strength after administration.
Choice D rationale: While the presence of these antibodies is a characteristic of myasthenia gravis, the Tensilon test is used to assess the immediate response to the medication for diagnostic confirmation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale: Intubation and mechanical ventilation may be needed if the respiratory muscles are affected by GBS, but this is not a routine intervention at this stage.
Choice B rationale: One of the main treatments of GBS is IV immunoglobulin therapy (IVIG), which involves infusing antibodies from donated blood plasma to block the harmful immune response that damages the nerves. Sandoglobulin is one of the brand names of IVIG used for GBS. IVIG can help shorten the duration and severity of the disease, and improve the recovery rate.
Choice C rationale: Methylprednisolone is a corticosteroid that can reduce inflammation, but it is not recommended for GBS, as it may worsen the condition or increase the risk of infection.
Choice D rationale: NG feeding tube may be required if the patient has difficulty swallowing, but this is also not a standard intervention at this time.
Correct Answer is A
Explanation
Choice A rationale: The correct answer is 5 units/hour. To calculate the units of insulin per hour, we need to use the following formula: units of insulin per hour = (units of insulin in the bag / volume of the bag) x infusion rate
Plugging in the given values, we get:
units of insulin per hour = (50 / 100) x 10 units of insulin per hour = 0.5 x 10
units of insulin per hour = 5
Therefore, the client is receiving 5 units of insulin every hour.
Choice B rationale: This is incorrect because it assumes that the infusion rate is equal to the units of insulin per hour, which is not true.
Choice C rationale: This is incorrect because it multiplies the units of insulin in the bag by the infusion rate, which is too high.
Choice D rationale: This is incorrect because it adds the units of insulin in the bag and the infusion rate, which is also too high.
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