A 70-year-old m an, recently diagnosed w ith a sm all-cell carcinom a, was adm itted to the hospital

A 70-year-old m an, recently diagnosed w ith a sm all-cell carcinom a, was adm itted to the hospital for surgical resection of the lung. On adm ission, the patient appeared lethargic and confused. Pertinent lab results on adm ission were Serum : Na+ 120 m Eq/L (norm al 136-145 m Eq/L) K+ 4.8 m Eq/L (norm al 4.5-5.0 m Eq/L) Osm olality 250 m Osm /L (norm al 275-300 m Osm /L) Urine: Na+ 50 m Eq/L (norm al 40-220 m Eq/L) Osm olality 400 m Osm /L (norm al 50-1200 m Osm /L) A drug from w hich of the follow ing classes would be useful in correcting the patient’s electrolyte im balance? A. Loop diuretics B. Thiazide diuretics C. Antidiuretic horm one (ADH) agonists D. Glucocorticoids E. ADH antagonists

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