A 40-year-old woman is managed in hospital following a cholecystectomy. She has history of rheumatoid arthritis. Physical examination shows a faint maculopapular rash. BMI is 30. Vitals are normal. Laboratory studies are shown:
Hemoglobin 14 g/dL
Serum sodium 140 mEq/L
Serum potassium 3.9 mEq/L
Urine protein 1+
Urine RBC 1+
Urine WBC 2+
Which of the following is most likely responsible for this patient’s findings?
