Q. The Spring Break trip to Cancun seemed like a great idea at the time, but now the 21-year-old college student is in the emergency department following a week of intractable vomiting. Laboratory tests show a serum bicarbonate level of 50.9 mmol/L, pH of 7.61, serum sodium of 125 mEq/L, potassium of 1.8 mEq/L, and chloride of 55 mEq/L. She is treated aggressively with fluid, electrolytes, and a diuretic. Which of the following is the most appropriate diuretic to treat this patient?