A nurse is caring for a client who has hypokalemia, hyperglycemia, and hypertension. A diagnosis of Cushing syndrome is suspected. Which of the following tests would the nurse anticipate the health care provider will order to help confirm the diagnosis of Cushing syndrome?
Radioactive iodine uptake test
24-hour cortisol urine study
Adrenocorticotropic hormone (ACTH) stimulation test
Edrophonium (Tensilon) test
The Correct Answer is B
A. Radioactive iodine uptake test: This test is used to assess thyroid function and diagnose thyroid disorders, such as hyperthyroidism. It is not used to diagnose Cushing syndrome.
B. 24-hour cortisol urine study: This test measures cortisol levels in the urine over a 24-hour period and is commonly used to diagnose Cushing syndrome by evaluating elevated cortisol production.
C. Adrenocorticotropic hormone (ACTH) stimulation test: This test evaluates adrenal function and is typically used to assess adrenal insufficiency rather than Cushing syndrome.
D. Edrophonium (Tensilon) test: This test is used to diagnose myasthenia gravis, not Cushing syndrome. It evaluates the effect of the medication on muscle strength.
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Related Questions
Correct Answer is B
Explanation
A. Excess mineralocorticoids: Mineralocorticoids primarily affect electrolyte and fluid balance. While excess mineralocorticoids can cause hypertension and fluid retention, they are not directly responsible for hirsutism or acne.
B. Excess adrenal androgens: Cushing syndrome can lead to elevated levels of adrenal androgens, which are responsible for hirsutism (excessive hair growth) and acne due to their androgenic effects.
C. Excess thyroid hormone: Thyroid hormone imbalances can affect various body systems, but they are not directly related to the development of hirsutism or acne seen in Cushing syndrome.
D. Excess glucocorticoids: While excess glucocorticoids are characteristic of Cushing syndrome and can cause a range of symptoms, hirsutism and acne are specifically due to excess adrenal androgens rather than glucocorticoids.
Correct Answer is B
Explanation
A. Weight gain and lethargy: These symptoms are more commonly associated with hypothyroidism or insufficient thyroid hormone levels, not with excess levothyroxine.
B. Nervousness and tachycardia: Excessive levothyroxine can lead to symptoms of hyperthyroidism, such as increased heart rate (tachycardia) and nervousness. These symptoms are consistent with an overdose of levothyroxine.
C. Facial puffiness and constipation: These symptoms are indicative of hypothyroidism, not hyperthyroidism. They would not be expected with an excess of levothyroxine.
D. Hypotension and intolerance to cold: These are symptoms of hypothyroidism and would not typically occur with an excess of levothyroxine. Excess levothyroxine usually causes symptoms of hyperthyroidism.
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