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1. A 65-year-old man with mild heart failure is treated with a loop diuretic . A few days later the man complains of muscle weakness. Laboratory results are shown below. Arterial PCO2: 48 mm Hg Arterial pH: 7.49 Plasma HCO3-: 35 mEq/L Which of the following is most likely decreased in this man?
A.
B.
C.
D.
E.


 

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