A staff nurse is teaching a client who has secondary hypothyroidism about the disease process. The client asks the nurse what causes secondary hypothyroidism. Which of the following responses should the nurse make?

"It is caused by the overproduction of T3, T4, and calcitonin by the thyroid gland."

"It is caused by the lack of production of adrenocorticotropic hormone by the pituitary gland."

"It is caused by the lack of production of thyroid stimulating hormone by the pituitary gland."

"It is caused by the lack of production of aldosterone by the adrenal gland."

Answer and Explanation

The Correct Answer is C

A. Secondary hypothyroidism is characterized by insufficient production of thyroid hormones (T3 and T4) due to inadequate stimulation from the pituitary gland, not due to overproduction. Overproduction of thyroid hormones would typically be associated with hyperthyroidism, not hypothyroidism.
B. Adrenocorticotropic hormone (ACTH) stimulates the adrenal glands to produce cortisol. A deficiency in ACTH would lead to adrenal insufficiency or Addison's disease, not secondary hypothyroidism.
Secondary hypothyroidism specifically involves a deficiency in thyroid-stimulating hormone (TSH), not ACTH.
C. Secondary hypothyroidism is caused by inadequate production of thyroid-stimulating hormone (TSH) by the pituitary gland. TSH is necessary for stimulating the thyroid gland to produce thyroid hormones (T3 and T4). When the pituitary gland does not produce enough TSH, the thyroid gland is not adequately stimulated, leading to low levels of thyroid hormones in the blood.
D. Aldosterone is a hormone produced by the adrenal glands that helps regulate sodium and potassium levels, as well as blood pressure. A deficiency in aldosterone is associated with conditions such as
Addison’s disease or primary adrenal insufficiency, not secondary hypothyroidism. Secondary
hypothyroidism specifically relates to issues with TSH production, not aldosterone.

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Correct Answer is D

Explanation

A. Hemoglobin levels measure the oxygen-carrying capacity of the blood. A reduced ejection fraction (30%) is more closely related to heart failure or significant cardiac dysfunction, which is not directly indicated by changes in hemoglobin levels.
B. Platelet levels are primarily involved in blood clotting and are less directly related to ejection fraction. Elevated or decreased platelet counts are not typically used as indicators of heart failure severity or reduced ejection fraction.
C. In cases of severe heart failure with a reduced ejection fraction, you may see elevated BUN levels due to these effects. However, it is not directly related to heart failure.
D. BNP is a hormone released by the heart in response to increased pressure and volume overload, typically seen in heart failure. Elevated BNP levels are associated with worsening heart failure and can be elevated in patients with a reduced ejection fraction. In heart failure, especially with an ejection fraction as low as 30%, BNP levels are often significantly elevated.

A. Phacoemulsification B. Extracapsular cataract extraction C. Cochlear implant D. Surgical iridectomy

Correct Answer is D

Explanation

A. Phacoemulsification is a procedure used to remove cataracts from the eye. It involves using ultrasound waves to break up the cloudy lens (cataract) into small fragments, which are then suctioned out. While this procedure is relevant for cataract treatment, it does not address the acute management of angle-closure glaucoma.
B. Extracapsular cataract extraction is a surgical procedure to remove a cataract from the eye by making an incision and extracting the lens in one piece or in large segments. Like phacoemulsification, this procedure is focused on cataract removal and does not directly treat the underlying issue of acute angle-closure glaucoma.
C. A cochlear implant is a device used to provide a sense of sound to individuals with severe hearing loss or deafness. This procedure is unrelated to the treatment of eye conditions or intraocular pressure and therefore is not appropriate for managing primary angle-closure glaucoma.
D. Surgical iridectomy is a procedure specifically aimed at treating angle-closure glaucoma. It involves creating a small hole (iridectomy) in the peripheral iris to allow aqueous humor to flow from the posterior chamber of the eye to the anterior chamber, bypassing the obstructed drainage angle.

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A staff nurse is teaching a client who has secondary hypothyroidism about the disease process. The client asks the nurse what causes secondary hypothyroidism. Which of the following responses should the nurse make?

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Correct Answer is D

Explanation

Correct Answer is D

Explanation

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