Correct Answer: B

Rationale: The correct answer is B: Palpitations and shortness of breath. These symptoms suggest excessive thyroid hormone levels, indicating that the levothyroxine dose is too high. Bradycardia and constipation (choice A) are more indicative of hypothyroidism, which occurs when thyroid hormone levels are low. Lethargy and lack of appetite (choice C) are also common symptoms of hypothyroidism. Muscle cramps and dry skin (choice D) can be associated with various conditions but are not specific to a high dosage of levothyroxine.

Correct Answer: A

Rationale: The correct answer is A: Increased TSH. In hypothyroidism, the thyroid gland is underactive, leading to low levels of thyroid hormones. As a compensatory mechanism, the pituitary gland releases more thyroid-stimulating hormone (TSH) to try to stimulate the thyroid gland to produce more hormones. Therefore, increased TSH levels are expected in hypothyroidism. Choice B is incorrect because in hypothyroidism, thyroxine (T4) levels are usually decreased, not increased. Choice C is incorrect as hypothyroidism is characterized by increased TSH levels, not decreased. Choice D is also incorrect because in hypothyroidism, T3 levels may be decreased, but TSH is a more sensitive indicator for diagnosis.

Correct Answer: B

Rationale: A potassium level of 6.5 mEq/L indicates hyperkalemia, which can lead to life-threatening arrhythmias. The correct priority action for the nurse is to notify the healthcare provider immediately. Hyperkalemia requires prompt intervention to lower potassium levels and prevent complications. Administering a potassium supplement (Choice A) would worsen the condition. Administering calcium gluconate (Choice C) is a treatment option but is not the nurse's priority action. Restricting the client's potassium intake (Choice D) may be necessary but is not the immediate priority when facing a critical potassium level.

Correct Answer: C

Rationale: A cold, pale lower leg is cause for the most concern as it could indicate compromised blood circulation, potentially leading to serious complications like ischemia or thrombosis. Diminished bowel sounds, loss of appetite, and tachypnea are not directly related to the client's condition in atrial fibrillation and the heart rate discrepancy.

Correct Answer: B

Rationale: The correct answer is B: Palpitations and shortness of breath. These symptoms suggest excessive thyroid hormone levels, indicating that the levothyroxine dose is too high. Bradycardia and constipation (choice A) are more indicative of hypothyroidism, which occurs when thyroid hormone levels are low. Lethargy and lack of appetite (choice C) are also common symptoms of hypothyroidism. Muscle cramps and dry skin (choice D) can be associated with various conditions but are not specific to a high dosage of levothyroxine.