A 54-year-old patient with pulmonary tuberculosis is evaluated for syndrome of inappropriate ADH secretion (SIADH). Which electrolyte imbalance would be expected in this patient?
a. Hyponatremia
b. Hyperkalemia
c. Hypernatremia
d. Hypokalemia
ANS: A
Hyponatremia occurs due to increased water reabsorption by kidneys. Hyperkalemia does not occur due to increased water reabsorption. Sodium levels are lowered with hyponatremia; they are not elevated. Hypokalemia does not occur; SIADH is a problem of sodium.
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