#august2020mccqe1
A 49-year-old woman comes to the clinic complaining of fatigue. She denies fever, vomiting, or diarrhea, but physical examination shows dry mucous membranes. Her blood pressure is 90/60 mm Hg. Laboratory studies show a plasma sodium level of 129 mEq/L and a potassium level of 5.5 mEq/L. Which of the following is the most likely cause of her hyponatremia?
(A) Addison disease
(B) Diabetes insipidus
(C) Hyperaldosteronism
(D) Psychogenic polydipsia
(E) Syndrome of inappropriate ADH secretion
A 49-year-old woman comes to the clinic complaining of fatigue. She denies fever, vomiting, or diarrhea, but physical examination shows dry mucous membranes. Her blood pressure is 90/60 mm Hg. Laboratory studies show a plasma sodium level of 129 mEq/L and a potassium level of 5.5 mEq/L. Which of the following is the most likely cause of her hyponatremia?
(A) Addison disease
(B) Diabetes insipidus
(C) Hyperaldosteronism
(D) Psychogenic polydipsia
(E) Syndrome of inappropriate ADH secretion
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