A patient with HIV and a CD4 count of 50 cells/µL develops Pneumocystis jirovecii pneumonia. First-line treatment is trimethoprim-sulfamethoxazole (TMP-SMX). Which electrolyte abnormality must be closely monitored?
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A
Hyponatremia from SIADH
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B
Hyperkalemia due to trimethoprim's amiloride-like effect on the collecting duct
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C
Hypocalcemia from calcium chelation
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D
Hypomagnesemia from renal wasting